Jython 2.5.1 Release Candidate 3 is out

[Frank Wierzbicki]

On behalf of the Jython development team, I'm pleased to announce that
Jython 2.5.1rc3 is available for download here:
https://sourceforge.net/projects/jython/files/jython-dev/2.5.1rc3/jython_installer-2.5.1rc3.jar/download
- See http://wiki.python.org/jython/InstallationInstructions for
installation instructions.

I didn't really want to have an RC3, I was hoping to have a final by
now, but a data loss bug was discovered in RC2 and that prompted one
more RC.  I'm hoping that this is the last one and that we'll have a
final shortly. Please see the NEWS file for detailed release notes.

Please report any bugs that you find here: http://bugs.jython.org

Thanks,

-Frank
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Try CodeInvestigator version 0.16.0

[hans moleman]

CodeInvestigator version 0.16.0 was released on Sept 23.

It requires Python version 2.6 and a Firefox browser.

Bug fixes:

  Indentation of comments and triple quoted strings. Triple quoted
strings
  could embed additional spaces.

  Additional __str__ calls were made for an instance.

  Record scripts that don't have a .py extension.

  ELIF sometimes fails.

  Docstrings passed over to generated program

  Issue with importing 64 bit modules

  Initial syntax check sometimes rejected too much.

  Thanks Tim!

Changes: Remarks.

  If you click in the right margin you can enter remarks.
  Remarks can be dragged to another location if you use Firefox
3.5.

  They are intended to work like poste-it notes attached to a
printout of the
  code.

Warning:

  The database will be initialized and you will lose your runs.


CodeInvestigator is a tracing tool for Python programs.

Running a program through CodeInvestigator creates a recording.
Program flow, function calls, variable values and conditions are all
stored for every line the program executes.
The recording is then viewed with an interface consisting of the
code. The code can be clicked: A clicked variable displays its
value,
a clicked loop displays its iterations.
You read code, and have at your disposal all the run time details of
that code. A computerized desk check tool and another way to learn
about your program.

http://sourceforge.net/project/showfiles.php?group_id=183942
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Sneaky web server 0.1

[Massimo Di Pierro]

A fast portable pure-python multithreaded experimental WSGI web server  
in 300 lines of code:


Python 2.4,2.5,2.6 version:

http://code.google.com/p/web2py/source/browse/trunk/gluon/sneaky.py

Python 3.0,3.1 version:

http://code.google.com/p/web2py/source/browse/trunk/gluon/ 
sneaky3.py


1) Some third party benchmarks are in the doc strings but you should  
run them yourself. These are benchmarks for the servers, not the  
frameworks.


2) We are not sure it is perfectly WSGI compliant but it is very  
similar to Cherrypy wsgiserver 3.2.


3) Experimental means we are still ironing down WSGI compliance and we  
have not tested chunked uploads (only regular uploads).


4) This is distributed with web2py, it works with web2py, but until we  
have more tests done, web2py still uses cherrypy's wsgi server in  
production.


5) The license is GPL but we are going change it to MIT of BSD or  
Apache when done.


6) We are posting here because we hope you will give it a try and  
report compatibility issues with your favorite framework and browser.  
This will help us fix problems and turn into a fast production server.

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Re: Finding application data after install - a solution?

[Gabriel Genellina]

En Tue, 22 Sep 2009 13:47:09 -0300, Wolodja Wentland  
wentl...@cl.uni-heidelberg.de escribió:

On Tue, Sep 22, 2009 at 07:42 -0700, Aahz wrote:



I want to:

1. Give administrators the freedom to install the data wherever  
they

   want
2. Adhere to the FHS (installing data within modules breaks it)
3. Be able to find that data again regardless of the installation
  scheme used

1 and 2 are easily solved... It was just not possible to find the data
again. The snippet in the original code solves that.



Given your mention of FHS, it sounds like you are focused on Unix-like
systems, in which case why not rely on the standard mechanisms for  
config

files?


I do not intentionally focus on UNIX type systems, but I have grown up
with *nix and I rather follow one scheme than none at all. But the
proposed way works on Windows as well, although the users might find
previously unseen directories like 'PREFIX/share/foo/doc' and the like
on their system.


I think many Windows users would say WTF!? when seeing those directories -  
and send cordial greetings to you, your parents and your whole family :)
Instead of ending with, e.g., a directory like c:\usr\share\foo\doc, your  
program should ask the OS for the special folder CSIDL_COMMON_APPDATA and  
add the foo\doc part. Or any other suitable standard folder. A directory  
like c:\usr\share\foo on Windows is as ridiculous as /Documents\ and\  
Settings/All\ Users/Application\ Data/foo on any unix like system.



As $DATA_PREFIX is only known at build time there was (until now) no
reliable way to find the data if the only information one can get is
$LIB_PREFIX, because these two might be totally unrelated.


You should probably raise this issue at the distutils-sig mailing list:  
http://www.python.org/community/sigs/current/distutils-sig/


--
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Re: Twisted: 1 thread in the reactor pattern

[jacopo]

On Sep 23, 5:57 pm, exar...@twistedmatrix.com wrote:
 On 06:08 am, jacopo.pe...@gmail.com wrote:

 I am diving into Twisted and Perspective Broker (PB) in particular and
 I would like to understand more about what happens behind the
 curtains.
 Say I have a client and a server on two different machines, the server
 gets callRemote() 19s in an asynchronous way, these requests are parked
 in a queue and then served sequentially (not in parallel  13 correct me
 if I am wrong).

 Since, as you point out below, there is only one thread, the remote
 methods can only be invoked one at a time.

 However, rather central to the asynchronous operation of Twisted
 libraries and applications, the remote method itself may return before
 the remote call has been completely serviced.  So while only one remote
 method will run at a time, each of the two remote calls may run
 concurrently at some point before they are responded to.

 If everything is implemented in a single thread, how
 is it possible that while the processor is engaged in the processing
 triggered by  callRemote() 19s at the same time the reactor is ready to
 listen/accept new events and put them in a queue? To me it looks like
 there should be at least 2 processes, one for the reactor and on for
 the rest.

 It isn't possible.  While the remote methods are running, other events
 are not being serviced.  This is what is meant when people describe
 Twisted as a *cooperative* multitasking system.  Event handlers (such
 as remote methods) run for a short enough period of time that it doesn't
 matter that the reactor is prevented from accepting new connections (or
 what have you) for the duration of their execution.

 Jean-Paul

Jean -Paul, not sure I have understood.
Say I have one server S and two clients C1 and C2 (all on separate
machines).

(a) C1 requests a remote call of f1() to S, f1() requires 5 minutes of
processing.
(b) S  puts f1() in a queue and returns immediately a Deferred to
C1.
(c) Now f1() starts and keeps S’s processor busy for 5 mins
(d)  after few seconds C2 requests a remote call f2() to S.
(e) On S the processor is already engaged with f1() but still
“someone” on S is able to accept the request from C2, put it in a
queue (after f1()) and return a Deferred to C2.
(f) At some point after f1() is finished f2() will start

I believe (b) is what you say “run for a short enough period of time
that it doesn't
matter that the reactor is prevented from accepting new connections
(or
what have you) for the duration of their execution.” ?!

Don’t we have (c) and (e) running at the same time here? How is it
possible to have only one Thread?

Thanks,
 Jacopo
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Re: logging.handlers.SMTPHandler question

[Vinay Sajip]

On Sep 24, 4:14 am, akonsu ako...@gmail.com wrote:
 hello,

 SMTPHAndler seems to email every single record separately. is there a
 way to collect all log output and then send it in a single email
 message? or do i have to do it manually?


You can use a buffering SMTP handler, see:

http://gist.github.com/192587

I haven't tested this code - I got it from this page (Polish
language):

http://python.pinger.pl/m/552751/bufferingsmtphandler
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Screencapture of a video

[koranthala]

Hi,
I was trying to capture the video which I was viewing using
Imagegrab module in PIL (windows). But, I found that the video was not
captured at all. A quick googling tells me that it is because the
windows does not have access to the viewing area.
   Is there any way I can capture the video? It will be very helpful.
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Re: logging.handlers.SMTPHandler question

[Vinay Sajip]

On Sep 24, 8:37 am, Vinay Sajip vinay_sa...@yahoo.co.uk wrote:
 On Sep 24, 4:14 am, akonsu ako...@gmail.com wrote:


 http://python.pinger.pl/m/552751/bufferingsmtphandler

Looking back at it, it looks as if it's adapted from some test code I
wrote back in 2002, see here:

http://opensolaris.org/sc/src/xen-gate/xvm-3.3+xen.hg/tools/python/logging/logging-0.4.9.2/test/log_test11.py

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Average of entries in a list of lists

[Evora]

Hello,

I'm a bit of a newbie to python, so this may very well be a basic question:

I have a list of lists, with around 1000 lists looking like this:
['0.000744', '0.480106', 'B'].

I need the average of the first to entries of all the lists, can anybody
help how me to do this?

Thanks in advance,
Evora
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Re: Average of entries in a list of lists

[Steven D'Aprano]

On Thu, 24 Sep 2009 01:30:10 -0700, Evora wrote:

 Hello,
 
 I'm a bit of a newbie to python, so this may very well be a basic
 question:
 
 I have a list of lists, with around 1000 lists looking like this:
 ['0.000744', '0.480106', 'B'].
 
 I need the average of the first to entries of all the lists, can anybody
 help how me to do this?

This sounds rather like homework, so here are some clues rather than a 
working solution.

Let's start with a simple function to calculate the average of some 
numbers. This is so trivial you should already have this, or something 
like it:


def average(numbers):
return sum(numbers)/float(len(numbers))


The call to float is to avoid a difficulty with division in versions of 
Python before 3.0. If you're using Python 3.0 or 3.1, you can leave it 
out. If you can guarantee that your numbers will already be floats, you 
can leave it out too. Or you can put this line at the top of your program:

from __future__ import division


Now you need another function which extracts all the numbers from your 
list-of-lists and converts them from strings to floats. 

To extract the first N items from a list L, you use:

L[:N]

For example, if you have L = ['0.1', '0.2', 1234, 'C'] and you want the 
first three items, you would say:

L[:3]

and get:

['0.1', '0.2', 1234]


Secondly, if you have a list of numbers in the form of strings:

L = ['0.1', '0.2']

and you want to get a list of actual floats, you can do this:

a, b = L
numbers = [float(a), float(b)]

but probably faster is:

numbers = map(float, L)


Thirdly, if you have a list-of-lists, and you want to combine values 
taken from each sub-list into a single summary list, you can use a 
variation on the following:


list_of_lists = [ [1, 'a', 'b'], [2, 'c', 'd'], [3, 'e', 'f'] ]
summary = []
for sublist in list_of_lists:
# extract the first item
x = sublist[0]
# add it to the end of the summary
summary.append(x)

# summary should now be [1, 2, 3]



Finally, if you find yourself writing something like:

x, y = sublist
L.append(x)
L.append(y)

you can save two lines by doing this:

L.extend(sublist)



Put all those pieces together, make a few minor modifications, and you 
will get a function that extracts the first two items from each sub-list, 
converts them from strings to floats, and consolidates them into a single 
summary list. Then you can pass that summary list to the average 
function, and Bob's your uncle.




-- 
Steven
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Re: Intercepting binding?

[Steven D'Aprano]

On Wed, 23 Sep 2009 18:10:10 -0700, andrew cooke wrote:

 these are valid points, but in practice the main use (for the restricted
 application i care about) is si,ple variables, and this is an optional
 extra to help the user, so it's OK if it only works sometimes.  at the
 moment i'd be happy with any half-baked unreliable solution that is
 transparent...

Speaking as a user (although not of Andrew's domain specific language), 
I'd like to say to developers PLEASE PLEASE PLEASE don't try to help me 
with half-baked unreliable solutions that only work sometimes.

There's few things worse than unreliable tools that break just when 
you've come to rely on them.




-- 
Steven
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Re: custom data warehouse in python vs. out-of-the-box ETL tool

[Tony Schmidt]

@Martin:  Thanks for your great feedback.

So do you think it would be very beneficial for me to start with an
Inman or Kimball book?  Or do you think it would be just leisure
reading and not very practical at best - fill my head with needless
jargon and inflexible dogmas, at worst?

I took a database class in college, understand the basic principals of
normalisation, and have built a few complicated RDBMS schemas from the
ground up.

On Sep 23, 12:28 pm, Martin P. Hellwig martin.hell...@dcuktec.org
wrote:
 snfctech wrote:
  @Martin:  I originally thought that there was nothing magical about
  building a datawarehouse, but then I did a little research and
  received all sorts of feedback about how datawarehouseprojects have
  notorious failure rates, that datawarehousedesign IS different than
  normal RDBMS - and then there's the whole thing about data marts vs.
  warehouses, Kimball vs. Inmon, star schemas, EAV tables, and so on.
  So I started to think that maybe I needed to get a little better read
  on the subject.

 Yes failure rate for datawarehouseprojects is quite high, so are other
 IT projects without data warehouses.

 Datawarehousedesign is not that much different than 'normal' RDBMS,
 you are following the same decisions for example:
 - Do I rather have multiple copies of data than slow or complicated
 access? If yes how do I ensure integrity?
 - How do I do access control on value level?
 - Do I need fail over or load balancing, if yes how much of it can I do
 on the application level?

 The thing is if you never have designed a database from a database point
 of view because you used abstractions that hide these ugly details then
 yes, Data warehouses are different than normal RDBMS.

 Yes you can make it all sound very complicated by throwing PHB words in
 like meta schema's, dimensional approach, subject orientated, etc.
 I like to see it more like I have a couple of data sources, I want to
 combine them  in a way that I can do neat stuff with it. The 'combine
 them' part is the datawarehousedesign, the 'neat stuff' part are the
 clients that use that datawarehouse. If you wish you can start making
 it more complicated by saying but my data sources are also my clients,
 but that is another step.

 I guess you can sum up all this by saying a datawarehouseis a method
 of gathering already existing data and present them in a different way,
 the concept is simple, the details can be complicated if you want/need
 it to be.

 --
 MPHhttp://blog.dcuktec.com
 'If consumed, best digested with added seasoning to own preference.'

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Re: IDE for python similar to visual basic

[Albert van der Horst]

In article pan.2009.09.11.12.02.03.656...@nowhere.com,
Nobody  nob...@nowhere.com wrote:
On Mon, 07 Sep 2009 23:56:17 +, Albert van der Horst wrote:

SNIP


 In view of the above this is not quite the correct way to put it.

 What I resent is that it leads to a non-professional attitude
 of the graphical part. Programming is over, lets now kludge
 some screens together. No. The graphics part has to be carefully
 designed, carefully tested, and carefully written, even if it
 is using a graphical tool. So, yes please, *do* create a GUI
 programmatically.

My view is that the program should provide functionality without
unnecessarily dictating the way in which that functionality is used.
Essentially, it's an issue of loose coupling.

The interface really should be configurable by the user according to their
needs. The code doesn't need to *know* the position or dimensions of
a widget, or its label or colour or spacing, let alone dictate them.

In most cases, the code shouldn't even get to dictate that specific
widgets even exist. Rather, it should provide actions which can
be bound to buttons, menu items and/or accelerators as the user chooses.

I don't necessarily disagree. But how does this work in practice?

I have a totally programmable editor (I do, I'm using it right no.)
I'm able to redefine commands to the point that I have no longer a
command to quit the program, and even have no longer a possibility to
define a new key-combination to quit the program. The hacker who wrote
it would say: don't do that.
Combined with my habit to switch the Caps lock and control keys
and use the editor full-screen, someone else really gets nowhere.

What if I prefer to have the gaz throttle and the clutch pedal of my
car switched. Is that a good idea?

Bottomline, let the user choose must not be an excuse for us,
where we are not able to propose a good choice.

(You may read the subject note-eater on my website.)

Groetjes Albert

--
-- 
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Economic growth -- being exponential -- ultimately falters.
alb...@spearc.xs4all.nl =n http://home.hccnet.nl/a.w.m.van.der.horst

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Date using input

[flebber]

Sorry to ask a simple question but I am a little confused how to
combine the input function and the date time module.

Simply at the start of the program I want to prompt the user to enter
the date, desirably in the format dd/mm/year.
However I want to make sure that python understands the time format
because first the date will form part of the name of the output file
so dd/mm/year as 1st September 2009, secondly if I have multiple
output files saved in a directory I may need to search later on the
files and contents of files by date range. So can I timestamp the
file?

I know this is a simple question but it eludes me exactly how to do
it.

I have the basics from http://docs.python.org/library/datetime.html

from datetime import date
date = input(type date dd/mm/year: )
datetime(day,month,year)

# some program blocks

#print to file(name = date) or apphend if it exists

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very weird python bug..

[Sampsa Riikonen]

Dear List,

Maybe someone could help out with this mysterious bug..

starting a python program in a directory named python, makes
the importation of modules sometimes impossible with cryptic
error messages..

sam...@linux-912g:~ mkdir paska2
sam...@linux-912g:~
sam...@linux-912g:~ echo import scipy  paska2/testi.py
sam...@linux-912g:~
sam...@linux-912g:~ export PYTHONPATH=
sam...@linux-912g:~
sam...@linux-912g:~ python paska2/testi.py
sam...@linux-912g:~
sam...@linux-912g:~ echo import scipy  python/testi.py
sam...@linux-912g:~
sam...@linux-912g:~ python python/testi.py
Traceback (most recent call last):
  File python/testi.py, line 1, in module
import scipy
  File /usr/local/lib/python2.6/site-packages/scipy/__init__.py, line 18, in 
module
from numpy import oldnumeric
  File /usr/lib/python2.6/site-packages/numpy/oldnumeric/__init__.py, line 
14, in module
from compat import *
  File /usr/lib/python2.6/site-packages/numpy/oldnumeric/compat.py, line 97, 
in module
import pickle, copy
  File /usr/lib/python2.6/pickle.py, line 171, in module
class Pickler:
  File /usr/lib/python2.6/pickle.py, line 250, in Pickler
def put(self, i, pack=struct.pack):
AttributeError: 'module' object has no attribute 'pack'
---

= If I start the program in directory paska2, everythings OK, but if the
directory name happens to be python, the importation of the modules goes 
nuts!

Very Weird.

Kind Regards,

Sampsa

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ja punnita kommentteja, kommentoi asiaa Sananvapausjärjestö 
Suomen  Penin varapuheenjohtaja Jarkko Tontti Uudelle Suomelle.
 (Uusi Suomi, 25.8.2009)
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Re: Creating a local variable scope.

[Albert van der Horst]

In article 65e8a017-abcb-49ad-8867-bc473f83e...@s39g2000yqj.googlegroups.com,
Bearophile  bearophileh...@lycos.com wrote:
Steven D'Aprano:

 (3) Create an inner function, then call that.

Several people after someone gives this anwer.


 My personal opinion is that if you really need a local scope
 inside a function, the function is doing too much and should be split up.

I agree. And a way to split a function is to define an inner function,
that's one of their main purposes. No need to add other things to the
language as the OP suggests.

There are exceptions. E.g. implementations of quicksort have a
recursive inner function, that you may prefer to not have exposed.
Also there may be data to communicate to or between instances of
the inner function.

At least that is the situation in most languages. I would be
interested to learn if and how Python gets around that.


Bye,
bearophile

Groetjes Albert

--
-- 
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Economic growth -- being exponential -- ultimately falters.
alb...@spearc.xs4all.nl =n http://home.hccnet.nl/a.w.m.van.der.horst

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Average of entries in a list of lists

[Evora]

Hello,

I'm a bit of a newbie to python, so this may very well be a basic question:

I have a list of lists, with around 1000 lists looking like this:
['0.000744', '0.480106', 'B'].

I need the average of the first to entries of all the lists, can anybody
help how me to do this?

Thanks in advance,
Evora
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Re: easy question, how to double a variable

[Iain King]

On Sep 23, 7:36 pm, David C Ullrich dullr...@sprynet.com wrote:
 On Tue, 22 Sep 2009 02:34:53 +, Steven D'Aprano wrote:
  On Mon, 21 Sep 2009 13:50:23 -0500, David C Ullrich wrote:

  But you actually want to return twice the value. I don't see how to do
  that.

  What?

  Seriously?

 You're saying it _can_ be done in Python? They must have added
 something to the standard library again. I mean how can you return
 twice a value without a twice function to start with? I've tried.
 You'd think

 def twice(n):
   return twice(n)

 would work, but I get this really long error message.

  You're not just yanking the OP's chain???

 That would be cruel. I mean the guy has enough problems already...

Sorry, there is no 'twice' builtin.  I think what you are looking for
is:

def twice(n):
return return n


Iain
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Re: Download and save a picture - urllib

[Piet van Oostrum]

 MRAB pyt...@mrabarnett.plus.com (M) wrote:

M mattia wrote:
 You were right, the problem was with the print function, using a normal
 write everythong works fine.
 
M You should open the output file as binary (it doesn't matter on
M Linux/Unix, but is a good idea anyway for portability).

It probably DOES matter also on Linux/Unix, as the OP is using Python3.
-- 
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URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
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Re: very weird python bug..

[Christian Heimes]

Sampsa Riikonen wrote:
 = If I start the program in directory paska2, everythings OK, but if the
 directory name happens to be python, the importation of the modules goes 
 nuts!

What's inside the python/ subdirectory? Do you happen to have a file
called struct.py inside it?

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Re: custom data warehouse in python vs. out-of-the-box ETL tool

[M.-A. Lemburg]

snfctech wrote:
 @Lemburg: Thanks for the suggestion.  I'm sure you make a fine
 product, but my development platform is Linux, and I don't want any
 additional Windows servers to deal with (than the ones I'm already
 stuck with.)

Strange, EasySoft used to support their product on Linux as well...

http://download.freshmeat.net/projects/easysoftsqlengine

Looks like they stopped with supporting it on Linux and now only
have Windows downloads available.

mxODBC and mxODBC Connect work just fine on Linux, so you could use
them to build a custom joining solution in Python.

It really depends on whether you need to run those joins on
an on-demand basis or not:

AFAIK, Talend can only run jobs which
then apply the JOINs and put the resulting data somewhere, e.g.
into a file or another database table.

With Python, you could do the join straight away and use the
data directly without the Python script - without having
to go through an external temporary resource.

Anyway, just a suggestion.

 On Sep 23, 2:02 am, M.-A. Lemburg m...@egenix.com wrote:
 snfctech wrote:
 Does anyone have experience building a data warehouse in python?  Any
 thoughts on custom vs using an out-of-the-box product like Talend or
 Informatica?

 I have an integrated system Dashboard project that I was going to
 build using cross-vendor joins on existing DBs, but I keep hearing
 that a data warehouse is the way to go.  e.g. I want to create orders
 and order_items with relations to members (MS Access DB), products
 (flat file) and employees (MySQL).

 Thanks in advance for any tips.

 You might want to look at this solution for doing cross-database JOINs:

 EasySoft ODBC Join-Engine:

http://www.easysoft.com/products/data_access/odbc_odbc_join_engine/in...

 and then use our mxODBC to access EasySoft's Engine:

http://www.egenix.com/products/python/mxODBC/

 or mxODBC Connect, if you have a client-server setup:

http://www.egenix.com/products/python/mxODBCConnect/

 Some database engines also allow integrating external ODBC
 data sources - the external tables then look like normal
 database tables and can be used in JOINs as well. I know that DB2
 and Oracle support this kind of setup. You can access those using
 mxODBC as well.

 --
 Marc-Andre Lemburg
 eGenix.com

 Professional Python Services directly from the Source  (#1, Sep 23 2009) 
 Python/Zope Consulting and Support ...http://www.egenix.com/
 mxODBC.Zope.Database.Adapter ...http://zope.egenix.com/
 mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/

 

 ::: Try our new mxODBC.Connect Python Database Interface for free ! 

eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
Registered at Amtsgericht Duesseldorf: HRB 46611
http://www.egenix.com/company/contact/
 

-- 
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eGenix.com

Professional Python Services directly from the Source  (#1, Sep 24 2009)
 Python/Zope Consulting and Support ...http://www.egenix.com/
 mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/
 mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/


::: Try our new mxODBC.Connect Python Database Interface for free ! 


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
   Registered at Amtsgericht Duesseldorf: HRB 46611
   http://www.egenix.com/company/contact/
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Re: Intercepting binding?

[Carl Banks]

On Sep 23, 5:49 pm, Rhodri James rho...@wildebst.demon.co.uk
wrote:
 On Thu, 24 Sep 2009 01:34:35 +0100, andrew cooke and...@acooke.org wrote:

  For example, I assume it's possible to somehow access the dictionary
  for the current block, but I can't see how to do this after
  assignment.  If I do it in the Foo constructor, for example, a will
  not yet be bound.

 I apologise for failing to notice earlier that you know what you're
 talking about.  I blame the hour :-)

 I'm not sure you can access the namespace dictionary of the current
 block (module?), that's the problem.  Oh, except via locals(), which
 might do exactly what you're after depending.  Excuse me, I'm being
 very dim tonight.


Hmmm.


@contextlib.contextmanager
def capture_changed_bindings():
before = sys._getframe(2).f_locals.copy()
changed = {}
yield changed
after = sys._getframe(2).f_locals
for key,value in after.iteritems():
if value is changed:
continue
if key not in before or value is not before[key]:
changed[key] = value

def test():
a = 2
b = 3
c = 4
with capture_changed_bindings() as changed:
b = 5
c = 4
d = 6
print changed

test()


Quick and dirty, not robust at all.  But you get the idea.

Carl Banks
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Re: Average of entries in a list of lists

[Xavier Ho]

On Thu, Sep 24, 2009 at 8:54 PM, Evora lasse_lorent...@hotmail.com wrote:


 Hello,

 I'm a bit of a newbie to python, so this may very well be a basic question:

 I have a list of lists, with around 1000 lists looking like this:
 ['0.000744', '0.480106', 'B'].

 I need the average of the first to entries of all the lists, can anybody
 help how me to do this?


Say if we have:

data = [['1', '2', 'B'],
['2', '3', 'B'],
['3', '4', 'B']]

The easier way is to iterate through the big list, and get out the first
item and add them. Once you've added them all, divide by the number of lists
in the big list.

total = 0
for list in data:
total += int(list[0])
print(total/len(data))

# OUTPUT
2.0

Or there is some ... not so obvious way, but same idea:

print(sum(int(numbers[0]) for numbers in data) / len(data))

# OUTPUT
2.0

(I'm using Python 3.1 by the way. You might have to change the print
function.)

Cheers,
Xav
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Re: Finding application data after install - a solution?

[Wolodja Wentland]

On Thu, Sep 24, 2009 at 04:07 -0300, Gabriel Genellina wrote:
 I do not intentionally focus on UNIX type systems, but I have grown up
 with *nix and I rather follow one scheme than none at all. But the
 proposed way works on Windows as well, although the users might find
 previously unseen directories like 'PREFIX/share/foo/doc' and the like
 on their system.

 I think many Windows users would say WTF!? when seeing those
 directories - and send cordial greetings to you, your parents and
 your whole family :)

That is probably true, but Windows has a 'etc' directory
(c:\windows\system32\drivers\etc) which AFAIK contains the hosts file
and/or other goodies from *NIX.

 Instead of ending with, e.g., a directory like c:\usr\share\foo\doc,
 your program should ask the OS for the special folder
 CSIDL_COMMON_APPDATA and add the foo\doc part. Or any other suitable
 standard folder. 

Is CSIDL_COMMON_APPDATA and environment variable set on all Windows
flavours? Are there versions that relying on this env var (if it is one)
will cause havoc and the death of millions of kittens? (ie. is it
available on all versions)

Where can I find Information on these other standard folders? Sorry,
but I have not used a Windows machine in ages.

 A directory like c:\usr\share\foo on Windows is as ridiculous as
 /Documents\ and\ Settings/All\ Users/Application\ Data/foo on any unix
 like system.

Agreed! Although I find the *NIX flavour more palatable to my eye ;-)

 As $DATA_PREFIX is only known at build time there was (until now) no
 reliable way to find the data if the only information one can get is
 $LIB_PREFIX, because these two might be totally unrelated.
 
 You should probably raise this issue at the distutils-sig mailing
 list: http://www.python.org/community/sigs/current/distutils-sig/

I already did [1] but the distutils developers are quite busy discussing
a the new format for setup.cfg. I did not got any feedback on the
solution I developed and thought that other Python users might have a
better solution to this problem.

How do *you* deal with application data in your programs? Is there a way
that works on as many platforms as possible?

so long

Wolodja

[1] http://mail.python.org/pipermail/distutils-sig/2009-September/013238.html


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Re: Intercepting binding?

[Carl Banks]

On Sep 23, 7:41 pm, andrew cooke and...@acooke.org wrote:
 On Sep 23, 10:11 pm, Dave Angel da...@ieee.org wrote:

  This comes up periodically in this list, and the answer is always
  something like:  you can't get there from here.

 Well, I'm both flexible and desperate, so this is a possible route
 (perhaps near enough):

 import sys

 class Foo(object):

     def __rlshift__(self, name):
         try:
             raise Exception()
         except:
             locals = sys.exc_traceback.tb_frame.f_back.f_locals
             locals[name] = self

 if __name__ == '__main__':
     foo = Foo()
     'a'  foo
     print(a)

Did you try this inside a function?   (Hint: it won't work in a
function.)

BTW, if you are desperate to do this then I'd say you lack good
perspective.  You are subverting some of the most basic behavior of
Python here for something of marginal and only occasional usefulness.
If you are that desperate just retype the name, it won't be the end of
the world.

a = Foo('a')


Carl Banks
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Re: Finding application data after install - a solution?

[Tim Golden]

Wolodja Wentland wrote:

I think many Windows users would say WTF!? when seeing those
directories - and send cordial greetings to you, your parents and
your whole family :)


That is probably true, but Windows has a 'etc' directory
(c:\windows\system32\drivers\etc) which AFAIK contains the hosts file
and/or other goodies from *NIX.


True, but it's little known and -- as you show -- buried deep in the
innards. I assume that it's the residue (or a symptom) of the Posix
compatibility layer.


Is CSIDL_COMMON_APPDATA and environment variable set on all Windows
flavours? 


Certainly all those which Python currently supports. There are
some small subtleties which have changed between older and
newer versions.

Are there versions that relying on this env var (if it is one)

will cause havoc and the death of millions of kittens? (ie. is it
available on all versions)

Where can I find Information on these other standard folders? Sorry,
but I have not used a Windows machine in ages.


(drops CSIDL_COMMON_APPDATA into Google and...)

http://msdn.microsoft.com/en-us/library/bb762494%28VS.85%29.aspx



A directory like c:\usr\share\foo on Windows is as ridiculous as
/Documents\ and\ Settings/All\ Users/Application\ Data/foo on any unix
like system.


Agreed! Although I find the *NIX flavour more palatable to my eye ;-)


And they say familiarity breeds contempt! ;)

TJG
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Re: Intercepting binding?

[andrew cooke]

On Sep 24, 7:12 am, Carl Banks pavlovevide...@gmail.com wrote:
     with capture_changed_bindings() as changed:
         b = 5
         c = 4
         d = 6
     print changed

 test()

 Quick and dirty, not robust at all.  But you get the idea.

 Carl Banks

brilliant.  using the with context is an excellent idea.  thanks very
much.

andrew
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Re: Date using input

[Dave Angel]

flebber wrote:

Sorry to ask a simple question but I am a little confused how to
combine the input function and the date time module.

Simply at the start of the program I want to prompt the user to enter
the date, desirably in the format dd/mm/year.
However I want to make sure that python understands the time format
because first the date will form part of the name of the output file
so dd/mm/year as 1st September 2009, secondly if I have multiple
output files saved in a directory I may need to search later on the
files and contents of files by date range. So can I timestamp the
file?

I know this is a simple question but it eludes me exactly how to do
it.

I have the basics from http://docs.python.org/library/datetime.html

from datetime import date
date = input(type date dd/mm/year: )
datetime(day,month,year)

# some program blocks

#print to file(name = date) or apphend if it exists


  
What version of python is your class, instructor, and text book using?  
If you want to learn fastest, you probably need to be using the same, or 
nearly same environment.  The input() function is one place where it 
matters whether it's Python 2.x or Python 3.x.  While you're at it, you 
should give the rest of your environment, such as which OS.


The doc page you pointed us to is for Python 2.6.2, but the input 
function on that version returns an integer.  Perhaps you want raw_input() ?


What code have you written, and what about it doesn't work?  Have you 
added print statements before the line that causes the error to see what 
the intermediate values are?



To try to anticipate some of your problems, you should realize that in 
most file systems, the slash is a reserved character, so you can't write 
the date that way.  I'd suggest using dashes. I put dates in directory 
names, and I always put year, then month, then day, because then sorting 
the filenames also sorts the dates.  I'm not in a country that sorts 
dates that way, but it does make things easier.  So directories for the 
last few days would be:

2009-09-22
2009-09-23
2009-09-24

When asking the user for a date, or telling him a date, by all means use 
your country's preferred format, as you say.


You mention timestamping the file.  While that can be done (Unix touch, 
for example), I consider it a last resort for keeping track of useful 
information.  At best, it should be an extra reminder of something 
that's already in the file contents.  And since many programs make the 
assumption that if the timestamp doesn't change, the contents haven't 
changed, you can only reasonably do this on a file whose contents are 
fixed when first created.


If you control the internal format of the file, put the date there, 
perhaps right after the header which defines the data type and version.



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Re: Average of entries in a list of lists

[Dave Angel]

Evora wrote:

Hello,

I'm a bit of a newbie to python, so this may very well be a basic question:

I have a list of lists, with around 1000 lists looking like this:
['0.000744', '0.480106', 'B'].

I need the average of the first to entries of all the lists, can anybody
help how me to do this?

Thanks in advance,
Evora
  
first to entries probably is intended to be first two entries  This 
is the same typo you made when you cross-posted on python-tutor.


Have you made a sample program (script) that partially works?  Show us 
what you've done, and explain what's wrong with it.  Usually by that 
time, you'll figure it out yourself, and learn more.  But if you're 
really stuck, and not just wanting someone else to do tonight's 
homework, show us what you've got.


Start with a program that defines a list of maybe 4 lists (you can 
change it to 1000 later).  Just enough data that you can see the 
algorithm working.  Then write some form of loop that you think might 
accomplish the result, or at least a subset of the result.  Show us that 
code, and its output, and explain why it falls short.


And of course, tell us the Python version and OS environment you're 
running in.  You'd be surprised how often that matters.


DaveA

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Re: Re: Date using input

[flebber . crue]

I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no class  
or instructor, I am learning this myself. I have Hetlands book Beginning  
Python Novice to Professional and online documentation books so Dive into  
Python, python.org etc.


Using the SPE editor.

I have currently only fully written basic psuedocode to give me a basic  
framework to guide myself.


#Basic pseudocode
#Purpose to get raw input and calculate a score for a field of options and  
return that

#score in a set in descending order.
#Multiple sets sould be written to the doc

#Obtain date
#Check if txt file with same date exists. If yes apphend to results to file.
#Obtain location
#Set Dictionary
#Event number
#Obtain set size
#Prompt first entry
#First Entry Number
#First Entry Name
#Set Blocks to obtain and calculate data
#Block 1 example - Placings Block
#Obtain number of events competed in
#Obtain how many times finished first
#Ensure this value is not greater than Number of Events
#Number of Firsts divide by Events * total by 15.
#Obtain Second finishes
#Ensure this value is not greater than Number of Events
#Number of Seconds divide by Events * total by 10.
#Continue On with this
#Block 2 - Lookup coach Dict and apply value.
#Obtain Surname of Coach
#Lookup Coach File and Match Name and get value.
#Blocks continue gaining and calculating values.
#create txt file named using date
#Sum Values Block1 + Block2 etc
#Print to file event number and field with name number individual Block  
totals and Sum Total

#Arranged in descending Sum Total.
#Prompt are there any more events? Yes return to start
#Apphend all additional events to same day file seperated by blank line.


On Sep 24, 2009 9:59pm, Dave Angel da...@ieee.org wrote:

flebber wrote:




Sorry to ask a simple question but I am a little confused how to



combine the input function and the date time module.





Simply at the start of the program I want to prompt the user to enter



the date, desirably in the format dd/mm/year.



However I want to make sure that python understands the time format



because first the date will form part of the name of the output file



so dd/mm/year as 1st September 2009, secondly if I have multiple



output files saved in a directory I may need to search later on the



files and contents of files by date range. So can I timestamp the



file?





I know this is a simple question but it eludes me exactly how to do



it.





I have the basics from http://docs.python.org/library/datetime.html





from datetime import date



date = input(type date dd/mm/year: )



datetime(day,month,year)





# some program blocks





#print to file(name = date) or apphend if it exists









What version of python is your class, instructor, and text book using? If  
you want to learn fastest, you probably need to be using the same, or  
nearly same environment. The input() function is one place where it  
matters whether it's Python 2.x or Python 3.x. While you're at it, you  
should give the rest of your environment, such as which OS.




The doc page you pointed us to is for Python 2.6.2, but the input  
function on that version returns an integer. Perhaps you want  
raw_input() ?




What code have you written, and what about it doesn't work? Have you  
added print statements before the line that causes the error to see what  
the intermediate values are?






To try to anticipate some of your problems, you should realize that in  
most file systems, the slash is a reserved character, so you can't write  
the date that way. I'd suggest using dashes. I put dates in directory  
names, and I always put year, then month, then day, because then sorting  
the filenames also sorts the dates. I'm not in a country that sorts dates  
that way, but it does make things easier. So directories for the last few  
days would be:



2009-09-22



2009-09-23



2009-09-24




When asking the user for a date, or telling him a date, by all means use  
your country's preferred format, as you say.




You mention timestamping the file. While that can be done (Unix touch,  
for example), I consider it a last resort for keeping track of useful  
information. At best, it should be an extra reminder of something  
that's already in the file contents. And since many programs make the  
assumption that if the timestamp doesn't change, the contents haven't  
changed, you can only reasonably do this on a file whose contents are  
fixed when first created.




If you control the internal format of the file, put the date there,  
perhaps right after the header which defines the data type and version.






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Re: Intercepting binding?

[andrew cooke]

On Sep 24, 5:20 am, Steven D'Aprano
ste...@remove.this.cybersource.com.au wrote:
 Speaking as a user (although not of Andrew's domain specific language),
 I'd like to say to developers PLEASE PLEASE PLEASE don't try to help me
 with half-baked unreliable solutions that only work sometimes.

 There's few things worse than unreliable tools that break just when
 you've come to rely on them.

The context is that I am looking at how best to provide debugging
support for a recursive descent parser.  If the actions are pure then
the whole thing is deterministic, so it might be possible to do
something like buddha (a declarative debugger for haskell).  I'm
also looking for a paper that was linked to somewhere this last month
or so on one of the popular sites/blogs about debugging prolog (since
the two are closely related - depth first search etc) - I know this is
vague, but if it rings a bell with anyone...  Anyway, doing this in
pure Python makes risks losing the information associated with
variable names.  I was wondering how I might reduce that.

The reason I asked for unreliable half-baked solutions is that I am
exploring what might be possible and, in my experience, this group
prefers to lecture me on what they think I should do rather than
answer the damn question.  I was hoping that by explicitly saying that
reliability is not important, people might feel more free to give
wild ideas that I could learn from and improve on.

It's significant, depressing, and not at all surprising that every
person who replied to this thread told me, in one way or another, that
was I was asking was wrong or impossible or foolhardy.

If I want your advice on how to write popular tools, you can be sure I
will come and ask you for it.  That is not what I asked for here.

But since we're all passing round unsolicited advice, here's some from
me.

Being an anal retentive will get you a long way in programming.
Dotting the is and crossing the ts is 99% of what it's all about.
I agree.  But the last 1% requires a little bit of imagination.  You
should try it one day.

Andrew
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Re: Solved - Python: automate input to MySQL query

[Joe Riopel]

On Wed, Sep 23, 2009 at 4:21 PM, D'Arcy J.M. Cain da...@druid.net wrote:
 In any case, I have a strong philosophical objection to using the same
 name to refer to two different things regardless of any operational
 issues.  The manager.firstname and employee.firstname are not the same
 thing and should have different names to reflect that.

They are in separate tables, that should be enough to reflect the fact
that they're not the same thing.

 A similar issue comes up in the classic situation of the inventory table
 price field and the sale item price field.  They sound like the same
 thing but they are not.  One is the current price in the catalogue and
 the other is the price it was sold for at a particular time.  They need
 different names for that reason.

I am not sure if you're talking about two different tables (inventory
and sale?). If you meant a single table; I would hope you don't have
two columns, with the same name, in a single table. If you were
talking about two different tables, see my above comment.
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Re: Date using input

[Dave Angel]

flebber.c...@gmail.com wrote:
I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no 
class or instructor, I am learning this myself. I have Hetlands book 
Beginning Python Novice to Professional and online documentation 
books so Dive into Python, python.org etc.


Using the SPE editor.

I have currently only fully written basic psuedocode to give me a 
basic framework to guide myself.


#Basic pseudocode
#Purpose to get raw input and calculate a score for a field of options 
and return that

#score in a set in descending order.
#Multiple sets sould be written to the doc

#Obtain date
#Check if txt file with same date exists. If yes apphend to results to 
file.

#Obtain location
#Set Dictionary
#Event number
#Obtain set size
#Prompt first entry
#First Entry Number
#First Entry Name
#Set Blocks to obtain and calculate data
#Block 1 example - Placings Block
#Obtain number of events competed in
#Obtain how many times finished first
#Ensure this value is not greater than Number of Events
#Number of Firsts divide by Events * total by 15.
#Obtain Second finishes
#Ensure this value is not greater than Number of Events
#Number of Seconds divide by Events * total by 10.
#Continue On with this
#Block 2 - Lookup coach Dict and apply value.
#Obtain Surname of Coach
#Lookup Coach File and Match Name and get value.
#Blocks continue gaining and calculating values.
#create txt file named using date
#Sum Values Block1 + Block2 etc
#Print to file event number and field with name number individual 
Block totals and Sum Total

#Arranged in descending Sum Total.
#Prompt are there any more events? Yes return to start
#Apphend all additional events to same day file seperated by blank line.


How many of these steps have you attempted actually coding?  Seems to me 
your first two steps are just string manipulation, and you only need to 
use the datetime module if you need to validate.  In other words, if the 
user specifies the date as 31/09/2009, you might want to later bounce 
back to him with a complaint that September only has 30 days.



So the first task is to accept input in the form   ab/cd/efgh   and 
produce a string  efgh-cd-ab.log   which you will then create as a text 
file.  And if the file exists, you'll append to it instead of 
overwriting it.   Can you do that much?


Make sure each of these is in a function with a good name, so you can 
later refine the behavior, like adding error checking.  So right now, 
you might code the function without error checking, and later add some 
validation, with error messages and new input query.


DaveA

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Re: Finding application data after install - a solution?

[Wolodja Wentland]

On Thu, Sep 24, 2009 at 12:51 +0100, Tim Golden wrote:
 Wolodja Wentland wrote:
 Is CSIDL_COMMON_APPDATA and environment variable set on all Windows
 flavours?
 
 Certainly all those which Python currently supports. There are
 some small subtleties which have changed between older and
 newer versions.

Great!

 Where can I find Information on these other standard folders? Sorry,
 but I have not used a Windows machine in ages.

 http://msdn.microsoft.com/en-us/library/bb762494%28VS.85%29.aspx

Thank you! I will definitely consider adding better Windows installation
support in one of the next releases.

so long

Wolodja


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Re: Solved - Python: automate input to MySQL query

[Tino Wildenhain]

Hi,

...


code, even that is not needed, as the columns are returned in the order
specified so code /knows/ that the first column isname  from /this/
table and the other column withname  is from /that/ table).


Unless you get a dictionary return.

In any case, I have a strong philosophical objection to using the same
name to refer to two different things regardless of any operational
issues.  The manager.firstname and employee.firstname are not the same
thing and should have different names to reflect that.


This seems to be a shortcome in your datamodel, in fact I'd see
a firstname of an employee as the same type of information as the
firstname of a manager.

So what you really would have is a table with all the people
and another which declares who is manager of who.

recommended of course is to name different data differently
and also to keep the name of the foreign keys the same on
every table so you can use:

SELECT a,b,c FROM tablea JOIN tableb USING (ab_id)

since this avoids duplicate columns in the result.




A similar issue comes up in the classic situation of the inventory table
price field and the sale item price field.  They sound like the same
thing but they are not.  One is the current price in the catalogue and
the other is the price it was sold for at a particular time.  They need
different names for that reason.


Yes and you should name them different in your query when they appear
in the same result set.

Regards
Tino




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Re: Date using input

[flebber]

On Sep 24, 10:58 pm, Dave Angel da...@ieee.org wrote:
 flebber.c...@gmail.com wrote:
  I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no
  class or instructor, I am learning this myself. I have Hetlands book
  Beginning Python Novice to Professional and online documentation
  books so Dive into Python, python.org etc.

  Using the SPE editor.

  I have currently only fully written basic psuedocode to give me a
  basic framework to guide myself.

  #Basic pseudocode
  #Purpose to get raw input and calculate a score for a field of options
  and return that
  #score in a set in descending order.
  #Multiple sets sould be written to the doc

  #Obtain date
  #Check if txt file with same date exists. If yes apphend to results to
  file.
  #Obtain location
  #Set Dictionary
  #Event number
  #Obtain set size
  #Prompt first entry
  #First Entry Number
  #First Entry Name
  #Set Blocks to obtain and calculate data
  #Block 1 example - Placings Block
  #Obtain number of events competed in
  #Obtain how many times finished first
  #Ensure this value is not greater than Number of Events
  #Number of Firsts divide by Events * total by 15.
  #Obtain Second finishes
  #Ensure this value is not greater than Number of Events
  #Number of Seconds divide by Events * total by 10.
  #Continue On with this
  #Block 2 - Lookup coach Dict and apply value.
  #Obtain Surname of Coach
  #Lookup Coach File and Match Name and get value.
  #Blocks continue gaining and calculating values.
  #create txt file named using date
  #Sum Values Block1 + Block2 etc
  #Print to file event number and field with name number individual
  Block totals and Sum Total
  #Arranged in descending Sum Total.
  #Prompt are there any more events? Yes return to start
  #Apphend all additional events to same day file seperated by blank line.

 How many of these steps have you attempted actually coding?  Seems to me
 your first two steps are just string manipulation, and you only need to
 use the datetime module if you need to validate.  In other words, if the
 user specifies the date as 31/09/2009, you might want to later bounce
 back to him with a complaint that September only has 30 days.

 So the first task is to accept input in the form   ab/cd/efgh   and
 produce a string  efgh-cd-ab.log   which you will then create as a text
 file.  And if the file exists, you'll append to it instead of
 overwriting it.   Can you do that much?

 DaveA

Trying but haven't got it working, thats why I started to try and use
datetime module.
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Re: Finding application data after install - a solution?

[Tim Golden]

Wolodja Wentland wrote:

On Thu, Sep 24, 2009 at 12:51 +0100, Tim Golden wrote:

Wolodja Wentland wrote:

Is CSIDL_COMMON_APPDATA and environment variable set on all Windows
flavours?


Just to clarify, now that I read your post more carefully,
there *is* an environment variable APPDATA which is the
user-specific Application Data (probably what you want).
If you need the common appdata (as in the question above),
this isn't exposed as an env var and you'll need to use
the shell API to query Windows for it.

Be warned: altho' it might appear that there is a common
pattern to these locations, they're not guaranteed, especially
in the face of i18n issues and XP-Vista changes etc.

TJG
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Re: Solved - Python: automate input to MySQL query

[D'Arcy J.M. Cain]

On Thu, 24 Sep 2009 08:49:02 -0400
Joe Riopel goo...@gmail.com wrote:
 On Wed, Sep 23, 2009 at 4:21 PM, D'Arcy J.M. Cain da...@druid.net wrote:
  In any case, I have a strong philosophical objection to using the same
  name to refer to two different things regardless of any operational
  issues.  The manager.firstname and employee.firstname are not the same
  thing and should have different names to reflect that.
 
 They are in separate tables, that should be enough to reflect the fact
 that they're not the same thing.

But manager_id (to join the employee to their manager) is in both tables
and it does refer to the same thing.

  A similar issue comes up in the classic situation of the inventory table
  price field and the sale item price field.  They sound like the same
  thing but they are not.  One is the current price in the catalogue and
  the other is the price it was sold for at a particular time.  They need
  different names for that reason.
 
 I am not sure if you're talking about two different tables (inventory
 and sale?). If you meant a single table; I would hope you don't have
 two columns, with the same name, in a single table. If you were
 talking about two different tables, see my above comment.

I'm talking about two different tables.  Consider an inventory table
that includes the current price of an item.  The invoice line item
table references the inventory table for details of the item.  A
classic mistake is to use the price from the inventory table to
determine the total price (item.quantity * invent.price).  The problem
is that the price may change tomorrow but the price it was sold for
yesterday does not.  Hence, invent.price and item.price are not the
same thing and I would name one of them differently.

-- 
D'Arcy J.M. Cain da...@druid.net |  Democracy is three wolves
http://www.druid.net/darcy/|  and a sheep voting on
+1 416 425 1212 (DoD#0082)(eNTP)   |  what's for dinner.
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Looger object only prints ERRORs

[daved170]

hi everybody,
I took your adviced and used the logging object.
I copied the example in 16.6.15.2 - using logging in multiple
modules from 
http://docs.activestate.com/activepython/3.1/python/library/logging.html.

unfortunattly it only prints to file the ERROR level's messages and
ignore the others. I tried to change the level with SETLEVEL but it
didn't help.
Any idea? thanks,
DaveD
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Re: easy question, how to double a variable

[Pablo Torres N.]

On Sep 24, 5:51 am, Iain King iaink...@gmail.com wrote:
 On Sep 23, 7:36 pm, David C Ullrich dullr...@sprynet.com wrote:



  On Tue, 22 Sep 2009 02:34:53 +, Steven D'Aprano wrote:
   On Mon, 21 Sep 2009 13:50:23 -0500, David C Ullrich wrote:

   But you actually want to return twice the value. I don't see how to do
   that.

   What?

   Seriously?

  You're saying it _can_ be done in Python? They must have added
  something to the standard library again. I mean how can you return
  twice a value without a twice function to start with? I've tried.
  You'd think

  def twice(n):
    return twice(n)

  would work, but I get this really long error message.

   You're not just yanking the OP's chain???

  That would be cruel. I mean the guy has enough problems already...

 Sorry, there is no 'twice' builtin.  I think what you are looking for
 is:

 def twice(n):
     return return n

 Iain

Actually, what he wants is:

(def twice (x)
  (+ (once x) (once x)))
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Re: Solved - Python: automate input to MySQL query

[D'Arcy J.M. Cain]

On Thu, 24 Sep 2009 15:03:26 +0200
Tino Wildenhain t...@wildenhain.de wrote:
  In any case, I have a strong philosophical objection to using the same
  name to refer to two different things regardless of any operational
  issues.  The manager.firstname and employee.firstname are not the same
  thing and should have different names to reflect that.
 
 This seems to be a shortcome in your datamodel, in fact I'd see
 a firstname of an employee as the same type of information as the
 firstname of a manager.
 
 So what you really would have is a table with all the people
 and another which declares who is manager of who.

Sure, I was trying to show a hypothetical situation.  In my real
databases I don't do that and in fact I point the manager_id field to
another entry in the same table.  Obviously in that case I am forced to
make it a different name even though it references the same column as
employee_id.

 recommended of course is to name different data differently
 and also to keep the name of the foreign keys the same on
 every table so you can use:
 
 SELECT a,b,c FROM tablea JOIN tableb USING (ab_id)
 
 since this avoids duplicate columns in the result.

Exactly.

  A similar issue comes up in the classic situation of the inventory table
  price field and the sale item price field.  They sound like the same
  thing but they are not.  One is the current price in the catalogue and
  the other is the price it was sold for at a particular time.  They need
  different names for that reason.
 
 Yes and you should name them different in your query when they appear
 in the same result set.

I want to name them differently even if they aren't in the same result
set because they are different things that just happen to have the same
type - money.  I wouldn't name every int column int and I wouldn't
name every price column price.

-- 
D'Arcy J.M. Cain da...@druid.net |  Democracy is three wolves
http://www.druid.net/darcy/|  and a sheep voting on
+1 416 425 1212 (DoD#0082)(eNTP)   |  what's for dinner.
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Re: Most active coroutine library project?

[Antoine Pitrou]

Grant Edwards invalid at invalid.invalid writes:
 
 Back when I worked on one of the first hand-held cellular
 mobile phones, it used co-routines where the number of
 coroutines was fixed at 2 (one for each register set in a Z80
 CPU).

Gotta love the lightning-fast EXX instruction. :-)

Regards

Antoine.


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Re: Looger object only prints ERRORs

[Jean-Michel Pichavant]

daved170 wrote:

hi everybody,
I took your adviced and used the logging object.
I copied the example in 16.6.15.2 - using logging in multiple
modules from 
http://docs.activestate.com/activepython/3.1/python/library/logging.html.

unfortunattly it only prints to file the ERROR level's messages and
ignore the others. I tried to change the level with SETLEVEL but it
didn't help.
Any idea? thanks,
DaveD
  

Diffcult to say without a bunch of code.
I would say that your FileHandler formatter has something wrong.
Please provide the code where you're adding this handler to you logger 
object.
Try to change the format to %(asctime)s - %(levelname)s - %(message)s 
for testing purpose and tell us if you still have issues.


/logging/ is the way to go, keep going :o)

Jean-Michel


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Re: Looger object only prints ERRORs

[Jean-Michel Pichavant]

Jean-Michel Pichavant wrote:

daved170 wrote:

hi everybody,
I took your adviced and used the logging object.
I copied the example in 16.6.15.2 - using logging in multiple
modules from 
http://docs.activestate.com/activepython/3.1/python/library/logging.html. 



unfortunattly it only prints to file the ERROR level's messages and
ignore the others. I tried to change the level with SETLEVEL but it
didn't help.
Any idea? thanks,
DaveD
  

Diffcult to say without a bunch of code.
I would say that your FileHandler formatter has something wrong.
Please provide the code where you're adding this handler to you logger 
object.
Try to change the format to %(asctime)s - %(levelname)s - 
%(message)s for testing purpose and tell us if you still have issues.


/logging/ is the way to go, keep going :o)

Jean-Michel



Ignore my post, I just misread your description.
Verify you don't have filters attached to your handlers.
If you have a hierarchy of loggers, make sure their level are all 
correctly set
For instance if you have a 'foo.bar' logger, you may set 'foo.bar' level 
to DEBUG, logs can still be filtered by 'foo' if this logger level is 
still ERROR.


JM
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Regex trouble

[Support Desk]

I am trying to loop over a dictionary  of phone numbers and using a python
regex to determine if they are long distance or local and then adding them
to their appropriate dictionary, My regex doesn't appear to be working
though.
My regex's are these

international__iregex=r'^1?(011|001)'
local__iregex=r'^1?(281|832|713|800)'
#long distance
ld_regex=r'^1?(281|832|713|800|866|877|011|001|888)'

long_distance= {}
My loop:
for key1,value1 in x.items():
if key1 == 'dest':
if re.search(ld_regex,value1):
long_distance[key1] = value1
print long_distance
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Re: Date using input

[flebber]

On Sep 24, 11:10 pm, flebber flebber.c...@gmail.com wrote:
 On Sep 24, 10:58 pm, Dave Angel da...@ieee.org wrote:



  flebber.c...@gmail.com wrote:
   I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no
   class or instructor, I am learning this myself. I have Hetlands book
   Beginning Python Novice to Professional and online documentation
   books so Dive into Python, python.org etc.

   Using the SPE editor.

   I have currently only fully written basic psuedocode to give me a
   basic framework to guide myself.

   #Basic pseudocode
   #Purpose to get raw input and calculate a score for a field of options
   and return that
   #score in a set in descending order.
   #Multiple sets sould be written to the doc

   #Obtain date
   #Check if txt file with same date exists. If yes apphend to results to
   file.
   #Obtain location
   #Set Dictionary
   #Event number
   #Obtain set size
   #Prompt first entry
   #First Entry Number
   #First Entry Name
   #Set Blocks to obtain and calculate data
   #Block 1 example - Placings Block
   #Obtain number of events competed in
   #Obtain how many times finished first
   #Ensure this value is not greater than Number of Events
   #Number of Firsts divide by Events * total by 15.
   #Obtain Second finishes
   #Ensure this value is not greater than Number of Events
   #Number of Seconds divide by Events * total by 10.
   #Continue On with this
   #Block 2 - Lookup coach Dict and apply value.
   #Obtain Surname of Coach
   #Lookup Coach File and Match Name and get value.
   #Blocks continue gaining and calculating values.
   #create txt file named using date
   #Sum Values Block1 + Block2 etc
   #Print to file event number and field with name number individual
   Block totals and Sum Total
   #Arranged in descending Sum Total.
   #Prompt are there any more events? Yes return to start
   #Apphend all additional events to same day file seperated by blank line.

  How many of these steps have you attempted actually coding?  Seems to me
  your first two steps are just string manipulation, and you only need to
  use the datetime module if you need to validate.  In other words, if the
  user specifies the date as 31/09/2009, you might want to later bounce
  back to him with a complaint that September only has 30 days.

  So the first task is to accept input in the form   ab/cd/efgh   and
  produce a string  efgh-cd-ab.log   which you will then create as a text
  file.  And if the file exists, you'll append to it instead of
  overwriting it.   Can you do that much?

  DaveA

 Trying but haven't got it working, thats why I started to try and use
 datetime module.

Surely getting it tottally mixed up

from datetime import date
def ObtainDate(params):
  date = raw_input(Type Date dd/mm/year: %2.0r%2.0r/%2.0r%2.0r/%4.0r
%4.0r%4.0r%4.0r)
 print date.datetime(year-month-day)
 #Check if txt file with same date exists. If yes apphend to results
to file.
date.append(datetime

and

def ObtainDate(params):
date = raw_input(Type Date dd/mm/year: )
date.format = (%4.0s%4.0s%4.0s%4.0s-%2.0s%2.0s-%2.0s)
print date.format


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Regex trouble

[Support Desk]

I am trying to loop over a dictionary  of phone numbers and using a python
regex to determine if they are long distance or local and then adding them
to their appropriate dictionary, My regex doesn't appear to be working
though.

 

My regex's are these

 

international__iregex=r'^1?(011|001)'  #Anything starting with these
prefixes is International

local__iregex=r'^1?(281|832|713|800)' #anything starting with these are
local

#long distance

ld_regex=r'^1?(281|832|713|800|866|877|011|001|888)'  #any number not
starting with these prefixes is long distance

 

long_distance= {}

My loop:

for key1,value1 in x.items():

if key1 == 'dest':   

if not re.search(ld_regex,value1):

long_distance[key1] = value1

print long_distance

 

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Re: Dynamic Form

[victorsubervi]

in line...

On Wed, Sep 23, 2009 at 9:13 PM, BJ Swope bigbluesw...@gmail.com wrote:

 What is your code not doing?


see below


 Are you winding up with duplicate data in the DB?


yes


 Is your web browser re-submitting the form with the same data if you
 refresh the screen?


yes


 Is your web browser pre-filling the fields of the form due to caching?


no

If I must use cookies, do I want cookielib/cookiejar, or just Cookie?
TIA.
V


 I don't understand what's not working


 On Wed, Sep 23, 2009 at 12:40 PM, Victor Subervi 
 victorsube...@gmail.comwrote:

 I've been trying the hidden field, but the problem is that when I set the
 variable flag, it stays in memory. I would rather just pass a var like I've
 been trying, but I don't think it's possible. Any ideas? Is a session cookie
 the only way? Here's more simplified code:

 #!/usr/bin/python

 import cgitb; cgitb.enable()
 import cgi
 import sys,os
 sys.path.append(os.getcwd())
 import MySQLdb
 import string, re

 def client():
   form = cgi.FieldStorage()
   client = string.replace(string.replace(form.getfirst('client', ''), ',
 '#39;'), '', '#34;')
   flag = form.getfirst('flag', '')
   print Content-Type: text/html
   print
   print 
 !DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Frameset//EN 
 http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd;
 head xmlns=http://www.w3.org/1999/xhtml;
 body
 
   if flag == '':
 print 
 form method=post action=client.py
 Company Name: input type='text' value='' size='20' maxlength='100'
 name='client' /br /
 input type='hidden' name='flag' value='y' /
 div align='center'
   input type='submit' value=' Send ' /
 /div
 /form
 /body/html
 
   else:
 host = 'h'
 db = 'db'
 user = 'u'
 passwd = '1'
 database = MySQLdb.connect(host, user, passwd, db)
 cursor = database.cursor()
 cursor.execute('insert into companies (client);' % (client))
 cursor.close()
 print '/body/html'

 client()

 TIA,
 V


 On Tue, Sep 22, 2009 at 1:43 PM, Dennis Lee Bieber wlfr...@ix.netcom.com
  wrote:

 On Tue, 22 Sep 2009 12:50:31 -0400, Victor Subervi
 victorsube...@gmail.com declaimed the following in
 gmane.comp.python.general:

  Well it's Web stuff, sure, but it's written in python :) The code
 follows.
  The problem is that I haven't figured out how to tell the program that
 the
  user has entered data and to clear the cache of that data so that it's
 not
  re-entered. How do I do that?

Remember, HTTP is a stateless protocol. EACH submission is
 considered a totally new transaction with no memory of the previous
 processing.

Possible solutions...

 *   Use a session cookie that identifies what phase in the multistep
 processing you are in...

 *   Use a hidden field in the form that defaults to, say False,
 when
 you first display the form, but then gets set to True during the first
 response process (and is then sent back out with True so the second
 response takes a different branch).

 --
Wulfraed Dennis Lee Bieber   KD6MOG
wlfr...@ix.netcom.com   
 HTTP://wlfraed.home.netcom.com/http://wlfraed.home.netcom.com/

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  --
 To argue that honorable conduct is only required against an honorable enemy
 degrades the Americans who must carry out the orders. -- Charles Krulak,
 Former Commandant of the Marine Corps

 We are all slave to our own paradigm. -- Joshua Williams

 If the letters PhD appear after a person's name, that person will remain
 outdoors even after it's started raining. -- Jeff Kay


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Re: Date using input

[Tim Chase]

Surely getting it tottally mixed up

from datetime import date
def ObtainDate(params):
  date = raw_input(Type Date dd/mm/year: %2.0r%2.0r/%2.0r%2.0r/%4.0r
%4.0r%4.0r%4.0r)
 print date.datetime(year-month-day)


By setting date = raw_input(...), you mask the datetime.date 
object preventing you from using it in the next print line.


Additionally, the - aren't used to separate parameters...you 
want commas.  You also haven't split out the year/month/day bits 
to pass to the date.datetime() constructor.  So immediate 
corrections involve:


1) choose a name other than date for the value returned from 
raw_input()


2) take that resulting value from step #1 and split it up so you 
have the constituent parts.  This is a wonderful use for tuple 
assignment.


3) After splitting parts up, you still have strings, so you need 
to convert them to numbers.  (for advanced users, I'd use map() 
to do the conversion in step #2)


4) once you have the year, month, and day values as integers, you 
can pass them to the datetime.date constructor (instead of the 
datetime.date.datetime constructor which is a little weird).



 #Check if txt file with same date exists. If yes apphend to results
to file.
date.append(datetime


You'd then want to create a file-name to open, based on the date 
object.  The strftime() method will help you here (see the docs 
on the format string).  Once you have the filename, you'll want 
to open a file with that name, appending to it if it already 
exists (see the docs on the file() object)


-tkc



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Re: logging.handlers.SMTPHandler question

[Vinay Sajip]

On Sep 24, 4:14 am, akonsu ako...@gmail.com wrote:
 hello,

 SMTPHAndler seems to email every single record separately. is there a
 way to collect all log output and then send it in a single email
 message? or do i have to do it manually?

 thanks
 konstantin

See also http://pypi.python.org/pypi/mailinglogger
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setting up dynamic descriptors in Python

[brian huggins]

Hello,

I want to set up descriptors at runtine, but it isn't working the way
i would expect.  Does anybody know if this is possible?  Here is an
example:

class Descriptor(object):
def __init__(self, name) :
self.val=0
self.name = name

def __get__(self, obj, objtype):
print 'Retrieving', self.name
return self.val

def __set__(self, obj, val):
print 'Updating' , self.name
self.val = val

class TestDesc (object):
x=Descriptor (x)
def __init__ (self):
self.y=Descriptor(y)

And Usage:
 test=TestDesc()
 test.x=0
Updating x
 test.x=4
Updating x
 test.x
Retrieving x
4
 test.y
descriptor.Descriptor object at 0x00B3A5F0

When i access y, it appears to be a regular object and not a
descriptor type object like x.  Is there a way to make y work the same
as x but setting it up during object creation?

thanks,
brian




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Re: Most active coroutine library project?

[Michele Simionato]

On Aug 23, 5:02 pm, Phillip B Oldham phillip.old...@gmail.com wrote:
 I've been taking a look at the multitude of coroutine libraries
 available for Python, but from the looks of the projects they all seem
 to be rather quiet. I'd like to pick one up to use on a current
 project but can't deduce which is the most popular/has the largest
 community.

 Libraries I looked at include: cogen, weightless, eventlet and
 circuits (which isn't exactly coroutine-based but it's event-driven
 model was intriguing).

 Firstly, are there any others I've missed? And what would the
 consensus be on the which has the most active community behind it?

The newest one seems to be diesel, by Simon Willison  Co: 
http://dieselweb.org/lib
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Re: Regex trouble

[MRAB]

Support Desk wrote:
I am trying to loop over a dictionary  of phone numbers and using a 
python regex to determine if they are long distance or local and then 
adding them to their appropriate dictionary, My regex doesn't appear to 
be working though.


My regex's are these

international__iregex=r'^1?(011|001)'
local__iregex=r'^1?(281|832|713|800)'
#long distance
ld_regex=r'^1?(281|832|713|800|866|877|011|001|888)'

long_distance= {}
My loop:
for key1,value1 in x.items():
if key1 == 'dest':   
if re.search(ld_regex,value1):

long_distance[key1] = value1
print long_distance


Define not working.

BTW, x.items() will give the key/value pairs, but key1 == 'dest' will be
true for only one of the keys, so you're really only looking at
x['dest'].

Please provide a simple though complete example showing the problem,
stating what you expected and what you actually got, including any
tracebacks if an exception occurred.
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Re: IDE for python similar to visual basic

[brian huggins]

 You can also try Eclipse + PyDev. It's not the same as Visual Studio, and I  
 am not sure about the GUI builder, but I think it's what you want.

I really like Eclipse + Pydev.  It is not a GUI builder at all but it
has a nice debugger, code completion and that kind of thing.  And its
free!

Brian
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Re: Dynamic Form

[BJ Swope]

1. Did you try the headers for no-caching of the page?
2. If you wish to avoid dupes in a DB, Primary Keys are the tool to prevent
duplicates.


On Thu, Sep 24, 2009 at 11:01 AM, victorsubervi victorsube...@gmail.comwrote:

 in line...

 On Wed, Sep 23, 2009 at 9:13 PM, BJ Swope bigbluesw...@gmail.com wrote:

 What is your code not doing?


 see below


 Are you winding up with duplicate data in the DB?


 yes


 Is your web browser re-submitting the form with the same data if you
 refresh the screen?


 yes


 Is your web browser pre-filling the fields of the form due to caching?


 no

 If I must use cookies, do I want cookielib/cookiejar, or just Cookie?
 TIA.
 V


 I don't understand what's not working


 On Wed, Sep 23, 2009 at 12:40 PM, Victor Subervi victorsube...@gmail.com
  wrote:

 I've been trying the hidden field, but the problem is that when I set the
 variable flag, it stays in memory. I would rather just pass a var like I've
 been trying, but I don't think it's possible. Any ideas? Is a session cookie
 the only way? Here's more simplified code:

 #!/usr/bin/python

 import cgitb; cgitb.enable()
 import cgi
 import sys,os
 sys.path.append(os.getcwd())
 import MySQLdb
 import string, re

 def client():
   form = cgi.FieldStorage()
   client = string.replace(string.replace(form.getfirst('client', ''),
 ', '#39;'), '', '#34;')
   flag = form.getfirst('flag', '')
   print Content-Type: text/html
   print
   print 
 !DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Frameset//EN 
 http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd;
 head xmlns=http://www.w3.org/1999/xhtml;
 body
 
   if flag == '':
 print 
 form method=post action=client.py
 Company Name: input type='text' value='' size='20' maxlength='100'
 name='client' /br /
 input type='hidden' name='flag' value='y' /
 div align='center'
   input type='submit' value=' Send ' /
 /div
 /form
 /body/html
 
   else:
 host = 'h'
 db = 'db'
 user = 'u'
 passwd = '1'
 database = MySQLdb.connect(host, user, passwd, db)
 cursor = database.cursor()
 cursor.execute('insert into companies (client);' % (client))
 cursor.close()
 print '/body/html'

 client()

 TIA,
 V


 On Tue, Sep 22, 2009 at 1:43 PM, Dennis Lee Bieber 
 wlfr...@ix.netcom.com wrote:

 On Tue, 22 Sep 2009 12:50:31 -0400, Victor Subervi
 victorsube...@gmail.com declaimed the following in
 gmane.comp.python.general:

  Well it's Web stuff, sure, but it's written in python :) The code
 follows.
  The problem is that I haven't figured out how to tell the program that
 the
  user has entered data and to clear the cache of that data so that it's
 not
  re-entered. How do I do that?

Remember, HTTP is a stateless protocol. EACH submission is
 considered a totally new transaction with no memory of the previous
 processing.

Possible solutions...

 *   Use a session cookie that identifies what phase in the multistep
 processing you are in...

 *   Use a hidden field in the form that defaults to, say False,
 when
 you first display the form, but then gets set to True during the first
 response process (and is then sent back out with True so the second
 response takes a different branch).

 --
Wulfraed Dennis Lee Bieber   KD6MOG
wlfr...@ix.netcom.com   
 HTTP://wlfraed.home.netcom.com/http://wlfraed.home.netcom.com/

 --
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  --
 To argue that honorable conduct is only required against an honorable
 enemy degrades the Americans who must carry out the orders. -- Charles
 Krulak, Former Commandant of the Marine Corps

 We are all slave to our own paradigm. -- Joshua Williams

 If the letters PhD appear after a person's name, that person will remain
 outdoors even after it's started raining. -- Jeff Kay


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-- 
To argue that honorable conduct is only required against an honorable enemy
degrades the Americans who must carry out the orders. -- Charles Krulak,
Former Commandant of the Marine Corps

We are all slave to our own paradigm. -- Joshua Williams

If the letters PhD appear after a person's name, that person will remain
outdoors even after it's started raining. -- Jeff Kay
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Re: custom data warehouse in python vs. out-of-the-box ETL tool

[Tony Schmidt]

Hi, Marc-Andre - well, so far you seem to be the only one suggesting
that cross-database joins is the way to go - everyone else has been
telling me to build a warehouse.  I initially was trying to avoid the
warehouse idea to avoid going through the external temporary
resource, as you say.  But then the situation came up where the data
warehouse would give me another benefit by enabling power users with
tools like OOBase to do their own reporting.  So I started to re-
consider it, and since then, no one has advised the direct approach
with connections/joins on multiple databases.

Have you had much luck circumventing the need for a data warehouse in
this way?

Thanks.

On Sep 24, 4:10 am, M.-A. Lemburg m...@egenix.com wrote:
 snfctech wrote:
  @Lemburg: Thanks for the suggestion.  I'm sure you make a fine
  product, but my development platform is Linux, and I don't want any
  additional Windows servers to deal with (than the ones I'm already
  stuck with.)

 Strange, EasySoft used to support their product on Linux as well...

 http://download.freshmeat.net/projects/easysoftsqlengine

 Looks like they stopped with supporting it on Linux and now only
 have Windows downloads available.

 mxODBC and mxODBC Connect work just fine on Linux, so you could use
 them to build a custom joining solution in Python.

 It really depends on whether you need to run those joins on
 an on-demand basis or not:

 AFAIK, Talend can only run jobs which
 then apply the JOINs and put the resulting data somewhere, e.g.
 into a file or another database table.

 With Python, you could do the join straight away and use the
 data directly without the Python script - without having
 to go through an external temporary resource.

 Anyway, just a suggestion.



  On Sep 23, 2:02 am, M.-A. Lemburg m...@egenix.com wrote:
  snfctech wrote:
  Does anyone have experience building a datawarehousein python?  Any
  thoughts on custom vs using an out-of-the-box product like Talend or
  Informatica?

  I have an integrated system Dashboard project that I was going to
  build using cross-vendor joins on existing DBs, but I keep hearing
  that a datawarehouseis the way to go.  e.g. I want to create orders
  and order_items with relations to members (MS Access DB), products
  (flat file) and employees (MySQL).

  Thanks in advance for any tips.

  You might want to look at this solution for doing cross-database JOINs:

  EasySoft ODBC Join-Engine:

     http://www.easysoft.com/products/data_access/odbc_odbc_join_engine/in...

  and then use our mxODBC to access EasySoft's Engine:

     http://www.egenix.com/products/python/mxODBC/

  or mxODBC Connect, if you have a client-server setup:

     http://www.egenix.com/products/python/mxODBCConnect/

  Some database engines also allow integrating external ODBC
  data sources - the external tables then look like normal
  database tables and can be used in JOINs as well. I know that DB2
  and Oracle support this kind of setup. You can access those using
  mxODBC as well.

  --
  Marc-Andre Lemburg
  eGenix.com

  Professional Python Services directly from the Source  (#1, Sep 23 
  2009) Python/Zope Consulting and Support ...        
  http://www.egenix.com/
  mxODBC.Zope.Database.Adapter ...            http://zope.egenix.com/
  mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/

  

  ::: Try our new mxODBC.Connect Python Database Interface for free ! 

     eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
      D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
             Registered at Amtsgericht Duesseldorf: HRB 46611
                 http://www.egenix.com/company/contact/

 --
 Marc-Andre Lemburg
 eGenix.com

 Professional Python Services directly from the Source  (#1, Sep 24 2009) 
 Python/Zope Consulting and Support ...        http://www.egenix.com/
  mxODBC.Zope.Database.Adapter ...            http://zope.egenix.com/
  mxODBC, mxDateTime, mxTextTools ...        http://python.egenix.com/

 

 ::: Try our new mxODBC.Connect Python Database Interface for free ! 

    eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
     D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
            Registered at Amtsgericht Duesseldorf: HRB 46611
                http://www.egenix.com/company/contact/

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Re: Dynamic Form

[Brian Victor]

victorsubervi wrote:
 On Wed, Sep 23, 2009 at 9:13 PM, BJ Swope bigbluesw...@gmail.com wrote:
 Is your web browser re-submitting the form with the same data if you
 refresh the screen?
 yes

I'm surprised no one has mentioned this before, but the standard
approach to this problem is to redirect after a successful POST.  That
way refreshing the browser won't try to re-POST the form.

http://en.wikipedia.org/wiki/Post/Redirect/Get

-- 
Brian

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Re: Twisted: 1 thread in the reactor pattern

[exarkun]

On 07:10 am, jacopo.pe...@gmail.com wrote:

On Sep 23, 5:57�pm, exar...@twistedmatrix.com wrote:
[snip]


It isn't possible. �While the remote methods are running, other events
are not being serviced. �This is what is meant when people describe
Twisted as a *cooperative* multitasking system.  Event handlers 
(such
as remote methods) run for a short enough period of time that it 
doesn't
matter that the reactor is prevented from accepting new connections 
(or

what have you) for the duration of their execution.

Jean-Paul


Jean -Paul, not sure I have understood.
Say I have one server S and two clients C1 and C2 (all on separate
machines).

(a) C1 requests a remote call of f1() to S, f1() requires 5 minutes 
of

processing.
(b) S  puts f1() in a queue and returns immediately a Deferred to
C1.
(c) Now f1() starts and keeps S 19s processor busy for 5 mins
(d)  after few seconds C2 requests a remote call f2() to S.
(e) On S the processor is already engaged with f1() but still
1Csomeone 1D on S is able to accept the request from C2, put it in a
queue (after f1()) and return a Deferred to C2.
(f) At some point after f1() is finished f2() will start

I believe (b) is what you say  1Crun for a short enough period of time
that it doesn't
matter that the reactor is prevented from accepting new connections
(or
what have you) for the duration of their execution. 1D ?!


If you have a function that takes 5 minutes to run, then you're blocking 
the reactor thread for 5 minutes and no other events are serviced until 
the function finishes running.


You have to avoid blocking the reactor thread if you want other events 
to continue to be serviced.  There are various strategies for avoiding 
blocking.  Different strategies are appropriate for different kinds of 
blocking code.


Jean-Paul
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Doubley imported module caused devastating bug

[Zac Burns]

Currently it is possible to import a file of one path to more than one
'instance' of a module. One notable example is import __init__ from
a package. See 
http://stackoverflow.com/questions/436497/python-import-the-containing-package

This recently caused a devastating bug in some of my code. What I have
is support for the Perforce global options as a context for a perforce
module. 
http://www.perforce.com/perforce/doc.072/manuals/cmdref/o.gopts.html#1040647
This way one can call functions that call many perforce command and
have them execute on a different client for example.

So, in module A and module B both imported the Perforce module, but
they turned out not to be the same module. Module A did with
Perforce.GlobalOptions(client=client): B.function()

B.function did not receive the new GlobalOptions because of this
problem. As a result important files on the original client were
overwritten (OUCH).

I would like to propose that it be made impossible in the Python
source to import two instances of the same module.

--
Zachary Burns
(407)590-4814
Aim - Zac256FL
Production Engineer (Digital Overlord)
Zindagi Games
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Re: Date using input

[Dave Angel]

flebber wrote:

On Sep 24, 11:10 pm, flebber flebber.c...@gmail.com wrote:
  

On Sep 24, 10:58 pm, Dave Angel da...@ieee.org wrote:





flebber.c...@gmail.com wrote:
  

I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no
class or instructor, I am learning this myself. I have Hetlands book
Beginning Python Novice to Professional and online documentation
books so Dive into Python, python.org etc.

Using the SPE editor.

I have currently only fully written basic psuedocode to give me a

basic framework to guide myself.

#Basic pseudocode

#Purpose to get raw input and calculate a score for a field of options
and return that
#score in a set in descending order.
#Multiple sets sould be written to the doc

#Obtain date

#Check if txt file with same date exists. If yes apphend to results to
file.
#Obtain location
#Set Dictionary
#Event number
#Obtain set size
#Prompt first entry
#First Entry Number
#First Entry Name
#Set Blocks to obtain and calculate data
#Block 1 example - Placings Block
#Obtain number of events competed in
#Obtain how many times finished first
#Ensure this value is not greater than Number of Events
#Number of Firsts divide by Events * total by 15.
#Obtain Second finishes
#Ensure this value is not greater than Number of Events
#Number of Seconds divide by Events * total by 10.
#Continue On with this
#Block 2 - Lookup coach Dict and apply value.
#Obtain Surname of Coach
#Lookup Coach File and Match Name and get value.
#Blocks continue gaining and calculating values.
#create txt file named using date
#Sum Values Block1 + Block2 etc
#Print to file event number and field with name number individual
Block totals and Sum Total
#Arranged in descending Sum Total.
#Prompt are there any more events? Yes return to start
#Apphend all additional events to same day file seperated by blank line.


How many of these steps have you attempted actually coding?  Seems to me
your first two steps are just string manipulation, and you only need to
use the datetime module if you need to validate.  In other words, if the
user specifies the date as 31/09/2009, you might want to later bounce
back to him with a complaint that September only has 30 days.
  
So the first task is to accept input in the form   ab/cd/efgh   and

produce a string  efgh-cd-ab.log   which you will then create as a text
file.  And if the file exists, you'll append to it instead of
overwriting it.   Can you do that much?
  
DaveA
  

Trying but haven't got it working, thats why I started to try and use
datetime module.



Surely getting it tottally mixed up

from datetime import date
def ObtainDate(params):
  date =aw_input(Type Date dd/mm/year: %2.0r%2.0r/%2.0r%2.0r/%4.0r
%4.0r%4.0r%4.0r)
 print date.datetime(year-month-day)
 #Check if txt file with same date exists. If yes apphend to results
to file.
date.append(datetime

and

def ObtainDate(params):
date =aw_input(Type Date dd/mm/year: )
date.format =%4.0s%4.0s%4.0s%4.0s-%2.0s%2.0s-%2.0s)
print date.format



  
As Tim says, first thing you want to do is rename that variable.  You've 
defined two symbols with the same name.


Then I'd ask what that %2.0r  stuff is inside the prompt to the user.

Do you understand what kind of data is returned by raw_input() ?  If so, 
look at the available methods of that type, and see if there's one 
called split() that you can use to separate out the multiple parts of 
the user's response.  You want to separate the dd from the mm and from 
the year.


Once you've split the text, then you want to recombine it in a different 
order, and with dashes between the parts.  If I were at your stage of 
experience, I'd not bother with the datetime module at all.  Just see if 
you can rebuild the string you need, assuming the user has entered a 
valid 10-character string.


Later you can go back and figure out the datetime logic.

DaveA
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test_sys failed

[Eno Compton 3]

On a new python 3 installation on a fedora 7 box, I get a test_sys failure.
Here is the console spew. Couldn't find any discussion about this. Suspect I
have fouled up but I don' t know how to proceed. Ideas?

853 test_sys
854 test test_sys failed -- Traceback (most recent call last):
855   File /home/eno/Python-3.1.1/Lib/test/test_sys.py, line 379, in
test_43581
856 self.assertEqual(sys.__stdout__.encoding,
sys.__stderr__.encoding)
857 AssertionError: 'ascii' != 'UTF-8'
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Re: Regex trouble

[Simon Forman]

On Thu, Sep 24, 2009 at 10:43 AM, Support Desk m...@ipglobal.net wrote:
 I am trying to loop over a dictionary  of phone numbers and using a python
 regex to determine if they are long distance or local and then adding them
 to their appropriate dictionary, My regex doesn't appear to be working
 though.

doesn't appear to be working is a useless way to characterize the
problem you're having.

Always tell us what you expected and what you got instead.  Preferably
with the actual traceback if any.

Also, post a /runnable/ code fragment. That way we can try it out for ourselves.


FWIW this problem is too simple (IMHO) for regular expressions.
Simply carve off the first three digits and check against sets of the
prefixes you're interested in:


#any number starting with these prefixes is not long distance
local_prefixes = set(['832', '877', '888', '713', '866', '011', '001',
'281', '800'])

long_distance= {}
for key1, value1 in x.iteritems():
if key1 == 'dest':
if value1[:3] not in local_prefixes:
long_distance[key1] = value1

HTH,
~Simon




 My regex's are these



 international__iregex=r'^1?(011|001)'  #Anything starting with these
 prefixes is International

 local__iregex=r'^1?(281|832|713|800)' #anything starting with these are
 local

 #long distance

 ld_regex=r'^1?(281|832|713|800|866|877|011|001|888)'  #any number not
 starting with these prefixes is long distance



 long_distance= {}

 My loop:

                 for key1,value1 in x.items():

                         if key1 == 'dest':

                                 if not re.search(ld_regex,value1):

                                         long_distance[key1] = value1

                                 print long_distance

Out of curiosity, why are you printing the whole dict for every key1
== 'dest' even when you're not modifying the output dict?




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Re: Python-URL! - weekly Python news and links (Sep 17)

[Cameron Laird]

In article h8tf2d$95...@lairds.us,
Gabriel Genellina python-...@phaseit.net wrote (but I edited):
.
.
.
More ways to define an empty function that you ever imagined:
http://groups.google.com/group/comp.lang.python/t/c9f494b6745c7d74/
.
.
.
Oops; this should have been URL: 
http://groups.google.com/group/comp.lang.python/browse_thread/thread/eddc376716d
f2029/ .
My apology, all.
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Re: DBHandler class for logging?

[kj]

In f8a64e65-d13c-410f-abf8-fa5fadcb9...@f10g2000vbf.googlegroups.com Vinay 
Sajip vinay_sa...@yahoo.co.uk writes:

See my answer to a question on Stack Overflow, which has the source
code for a simple handler which writes to a database using the Python
DB-API 2.0:

http://stackoverflow.com/questions/935930/creating-a-logging-handler-to-connect-to-oracle/1014450#1014450

Although the question relates to Oracle, my answer is not so specific.
It's not production quality code but it should get you started.


Many thanks, to both you and Diez.

kynn
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Re: pycopg2 build problems

[devaru]

On Sep 24, 2:14 am, phi...@semanchuk.com wrote:
 Quoting Wolodja Wentland wentl...@cl.uni-heidelberg.de:



  On Wed, Sep 23, 2009 at 12:24 -0700, devaru wrote:
  I'm trying to install psycopg2 on my system. I followed the
  instruction in INSTALL file and gave the command
  python setup.py build
  running build
  running build_py
  running build_ext
  error: No such file or directory

  I ran into this some days ago. The problem is not related to the
  distribution you downloaded, but to missing information about PostgreSQL
  itself.

  IIRC the file in question is /usr/bin/pg_config. The file is  
  probably packaged
  in some lib*-dev package on your distribution.

 That's the most common install problem with psycopg2 -- setup.py can't  
 find (or execute) pg_config which it needs to decide how to talk to  
 Postgres. I remember it giving a different (and more descriptive)  
 error but I haven't used psycopg2 recently.

 To the OP: if executing pg_config fails from the same command line in  
 which you're running setup.py, then Wolodja is absolutely correct. You  
 need to get pg_config on your path somewhere, or there might be an  
 environment variable you can set to tell setup where to find it if you  
 don't want it in your path.

 Good luck
 Philip



  --- Debian example ---
  $ apt-file search /usr/bin/pg_config
  libpq-dev: /usr/bin/pg_config
  --- snip ---

  thanks for all the fish

      Wolodja



Thank you all.

Yes, as Philip and Wolodja have said, we need pg_config in the PATH
variable for psycopg2 to build.
Then I ran into a problem where I had to install the dependency
package python-devel.
Now psycopg2 installed fine.
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PExpect on Windows System Using Cygwin

[Kevin Holleran]

Hello,

I downloaded and installed the pexpect module and wrote a script.  All is
well and good, but the script proved to be pretty useful and now I was asked
to run it as a scheduled task up on a server to run periodically.  I was
intending on simply packaging it up with Py2Exe and moving it to the server
that way.

However, when I went to test it, I received this error

Traceback (most recent call last):
  File script.py, line 17, in module
import pexpect
  File lib\site-packages\pexpect.py, line 85, in module
support it. Pexpect is intended for UNIX-like operating systems.)
ImportError: No module named resource

A critical module was not found. Probably this operating system does not
support it. Pexpect is intended for UNIX-like operating systems.

So now I realize that when I was testing on my system, I run cygwin and so
everything worked fine

Is there a .dll that I can copy with it or anything so that it works without
having to install cygwin on the server that will be hosting this scheduled
task?

Thanks for any help.

Kevin
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When is divmod(a,b)[0] == floor(a/b)-1 ?

[kj]

The docs for divmod include the following:

divmod(a, b)
...For floating point numbers the result is (q, a % b), where q
is usually math.floor(a / b) but may be 1 less than that. ...

I know that floating point math can sometimes produce unexpected
results, so the above caveat is not entirely surprising.  Still,
I would find it helpful to see a specific example where
divmod(a, b)[0] is equal to math.floor(a/b)-1.  Does anybody know
one?

Thanks!

kynn 
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Repeated output when logging exceptions

[John Gordon]

I wrote some code to handle and log exceptions in my application.
It works well, but it produces double output for each exception.
How can I fix this?

Here's the pared-down code:

- main.py
import exceptionLogger
import doStuff

exlog = exceptionLogger.exceptionLogger()

stuff = doStuff.doStuff()

try:
stuff.doit()
except Exception,msg:
exlog.logException()


- exceptionLogger.py
import traceback
import logging
import os

class exceptionLogger:
loggingLevel = 
logger = None

def __init__(self):
self.logger = logging.getLogger(foo)
self.loggingLevel = DEBUG
if self.loggingLevel == DEBUG:
self.logger.setLevel(logging.DEBUG)
handler = logging.FileHandler(error.txt)
format = %(asctime)s %(levelname)-8s %(message)s
formatter = logging.Formatter(format)
handler.setFormatter(formatter)
self.logger.addHandler(handler)

def logMsg(self,message):
try:
if self.loggingLevel == DEBUG:
self.logger.debug(message)
except:
self.stopLogging()

def logException(self):
Write an exception traceback to the logfile.
# save the stack trace to a file and then copy the contents of that
# file to the log.  (traceback.format_exc would allow us to avoid
# using a temporary file, but it is not available in python 2.3)

TMPFILE = os.tmpfile()
traceback.print_exc(None, TMPFILE)
TMPFILE.flush()
self.logMsg( ** EXCEPTION BEGINS **)
self.logMsgFromFile(TMPFILE)
self.logMsg( ** EXCEPTION ENDS   **)

TMPFILE.close()

def logMsgFromFile(self,file):
Read the contents of a file into a string and log the string.
file.seek(0)
msg = 
for line in file:
msg = msg + line
self.logMsg(msg)

def stopLogging(self):
logging.shutdown()

- doStuff.py
import exceptionLogger

class doStuff:

def doit(self):
exlog = exceptionLogger.exceptionLogger()
try:
raise ValueError, hi there
except Exception:
exlog.logException()


And here's the contents of error.txt:

- errror.txt
2009-09-24 14:22:23,288 DEBUG ** EXCEPTION BEGINS **
2009-09-24 14:22:23,288 DEBUG ** EXCEPTION BEGINS **
2009-09-24 14:22:23,288 DEBUGTraceback (most recent call last):
  File /home/gordonj/exception/doStuff.py, line 8, in doit
raise ValueError, hi there
ValueError: hi there

2009-09-24 14:22:23,288 DEBUGTraceback (most recent call last):
  File /home/gordonj/exception/doStuff.py, line 8, in doit
raise ValueError, hi there
ValueError: hi there

2009-09-24 14:22:23,288 DEBUG ** EXCEPTION ENDS   **
2009-09-24 14:22:23,288 DEBUG ** EXCEPTION ENDS   **


As you can see, all of the output is doubled.  Header lines, footer lines,
and body text.

Why is this happening?  I suspect it's because I'm declaring two instances
of the exceptionLogger class, which ends up calling logger.addHandler()
twice.  Is that right?

What would be a better way to handle this?

Thanks.

-- 
John Gordon   A is for Amy, who fell down the stairs
gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, The Gashlycrumb Tinies

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Re: Doubley imported module caused devastating bug

[Ethan Furman]

Zac Burns wrote:

Currently it is possible to import a file of one path to more than one
'instance' of a module. One notable example is import __init__ from
a package. See 
http://stackoverflow.com/questions/436497/python-import-the-containing-package

This recently caused a devastating bug in some of my code. What I have
is support for the Perforce global options as a context for a perforce
module. 
http://www.perforce.com/perforce/doc.072/manuals/cmdref/o.gopts.html#1040647
This way one can call functions that call many perforce command and
have them execute on a different client for example.

So, in module A and module B both imported the Perforce module, but
they turned out not to be the same module. Module A did with
Perforce.GlobalOptions(client=client): B.function()

B.function did not receive the new GlobalOptions because of this
problem. As a result important files on the original client were
overwritten (OUCH).

I would like to propose that it be made impossible in the Python
source to import two instances of the same module.

--
Zachary Burns
(407)590-4814
Aim - Zac256FL
Production Engineer (Digital Overlord)
Zindagi Games


I believe that modules are imported only once, and my toy example 
demonstrates that (python 2.5):


test_import.py:
  testing multiple imports
  CONSTANT = 928
  version = (2, 0, 9)
  plug_ins = []
  random_text = 'some text here'
  def set_text(new_text):
  global random_text
  random_text = new_text
  plug_ins.append(new_text)

A.py:
  import test_import
  print test_import.version
  test_import.set_text('hello!')
  print test_import.plug_ins
  print test_import.CONSTANT
  test_import.CONSTANT = 'changed!'

B.py:
  import test_import
  print test_import.version
  test_import.set_text('world!')
  print test_import.plug_ins
  print test_import.CONSTANT

Running...
  In [1]: import A
  (2, 0, 9)
  ['hello!']
  928

  In [2]: import B
  (2, 0, 9)
  ['hello!', 'world!']
  changed!

As you can see, module A made a change to test_import.CONSTANT, and if 
they were different things then B would not have seen it, yet B *did* 
see it.


This makes me wonder if A) Perforce.GlobalOptions isn't actually setting 
module level variables, or B) B.function is using copies of those 
variables that were set when B was originally imported, so is not seeing 
the changes or C) there is yet another wrinkle here that I don't 
know about.  ;-)


~Ethan~
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Evaluate coding and style

[Brown, Rodrick]

I recently started playing with Python about 3 days now (Ex Perl guy) and 
wanted some input on style and structure of what I'm doing before I really 
start picking up some bad habits here is a simple test tool I wrote to validate 
home dirs on my system.

Please evaluate and let me know what could have been done better. Once again 
this is really my first time using python.


$ ./homedir_exists.py root mqm pcap
root successful!
Directory: /var/arpwatch not found!
pcap successful!
mqm successful!


$ cat homedir_exists.py
#!/usr/bin/env python

import sys, os
from re import match

userlist = []
filename = '/etc/passwd'

for user in sys.argv[1:]:
  userlist.append(user)

try:
  fh = open(filename)
except IOError:
  print No such filename: %s % (filename)

def checkDir(username):
  data = fh.readlines()
  for line in data:
for user in username:
  if match(user,line):
s = line.split(':')
if not os.path.isdir(s[5]):
  print Directory: %s not found! % (s[5])
print s[0] +  successful!

checkDir(userlist)
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Re: Looger object only prints ERRORs

[Vinay Sajip]

On Sep 24, 2:27 pm, daved170 daved...@gmail.com wrote:
 hi everybody,
 I took your adviced and used theloggingobject.
 I copied the example in 16.6.15.2 - usingloggingin multiple
 modules 
 fromhttp://docs.activestate.com/activepython/3.1/python/library/logging.html.

 unfortunattly it only prints to file the ERROR level's messages and
 ignore the others. I tried to change the level with SETLEVEL but it
 didn't help.
 Any idea? thanks,
 DaveD

You need to post some code. I just copied and pasted that example into
app.py and auxiliary_module.py, and running it produced a spam.log
file with the expected results. So your copy must be different from
that example, and the problem will be somehow related to something
you've changed.

Regards,

Vinay Sajip
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help wanted with list

[Ahmed Shamim]

list = [ 'a', '1', 'b', '2']
what would be the logic, if I input a to get output 1.
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Re: help wanted with list

[Iuri]

You should use a dictionary.
dic = {'a':1, 'b':2}

Use dic['a'] to get output 1.

[]s
iurisilvio



On Thu, Sep 24, 2009 at 5:31 PM, Ahmed Shamim partha.sha...@gmail.comwrote:

 list = [ 'a', '1', 'b', '2']
 what would be the logic, if I input a to get output 1.
 --
 http://mail.python.org/mailman/listinfo/python-list

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Re: Doubley imported module caused devastating bug

[Carl Banks]

On Sep 24, 10:26 am, Zac Burns zac...@gmail.com wrote:
 Currently it is possible to import a file of one path to more than one
 'instance' of a module. One notable example is import __init__ from
 a package. 
 Seehttp://stackoverflow.com/questions/436497/python-import-the-containin...

 This recently caused a devastating bug in some of my code. What I have
 is support for the Perforce global options as a context for a perforce
 module.http://www.perforce.com/perforce/doc.072/manuals/cmdref/o.gopts.html#...
 This way one can call functions that call many perforce command and
 have them execute on a different client for example.

 So, in module A and module B both imported the Perforce module, but
 they turned out not to be the same module. Module A did with
 Perforce.GlobalOptions(client=client): B.function()

 B.function did not receive the new GlobalOptions because of this
 problem. As a result important files on the original client were
 overwritten (OUCH).

 I would like to propose that it be made impossible in the Python
 source to import two instances of the same module.

Impossible's a pretty strong word.

It's a reasonable request, but with Python's importing the way it is
it'd be kind of hard to do.  A Python file can be visible in multiple
ways.

However, anyone who does import __init__ (or from . import
__init__ with relative import) is asking for trouble, I can't think
of any valid reason to do it, and I wouldn't mind seeing that
forbidden, but it's simple to avoid.  Someone probably did that
because they didn't know how to import a containing package from one
of its modules, failing to realize that it created a new module.


Carl Banks
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iterate over list while changing it

[Torsten Mohr]

Hello,

a = [1, 2, 3, 4, 5, 6]

for i, x in enumerate(a):
if x == 3:
a.pop(i)
continue

if x == 4:
a.push(88)

print i, i, x, x

I'd like to iterate over a list and change that list while iterating.
I'd still like to work on all items in that list, which is not happening
in the example above.
The conditions in the example are not real but much more complex
in reality.

Can anybody tell me how to do this?


Thanks for any hints,
Torsten.


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Re: help wanted with list

[Simon Brunning]

2009/9/24 Ahmed Shamim partha.sha...@gmail.com:
 list = [ 'a', '1', 'b', '2']
 what would be the logic, if I input a to get output 1.

Turn it into a dictionary first:

 mylist = [ 'a', '1', 'b', '2']
 mydict = dict(zip(mylist[::2], mylist[1::2]))
 mydict['a']
'1'

-- 
Cheers,
Simon B.
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help wanted with list

[Xavier Lapointe]

Not sure I understand well, but let say I did..

list[list.index('a')+1]

Le 14:59, Ahmed Shamim a écrit :

list = [ 'a', '1', 'b', '2']
what would be the logic, if I input a to get output 1.

   


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Re: Doubley imported module caused devastating bug

[Zac Burns]

On Thu, Sep 24, 2009 at 1:38 PM, Carl Banks pavlovevide...@gmail.com wrote:
 On Sep 24, 10:26 am, Zac Burns zac...@gmail.com wrote:
 Currently it is possible to import a file of one path to more than one
 'instance' of a module. One notable example is import __init__ from
 a package. 
 Seehttp://stackoverflow.com/questions/436497/python-import-the-containin...

 This recently caused a devastating bug in some of my code. What I have
 is support for the Perforce global options as a context for a perforce
 module.http://www.perforce.com/perforce/doc.072/manuals/cmdref/o.gopts.html#...
 This way one can call functions that call many perforce command and
 have them execute on a different client for example.

 So, in module A and module B both imported the Perforce module, but
 they turned out not to be the same module. Module A did with
 Perforce.GlobalOptions(client=client): B.function()

 B.function did not receive the new GlobalOptions because of this
 problem. As a result important files on the original client were
 overwritten (OUCH).

 I would like to propose that it be made impossible in the Python
 source to import two instances of the same module.

 Impossible's a pretty strong word.

 It's a reasonable request, but with Python's importing the way it is
 it'd be kind of hard to do.  A Python file can be visible in multiple
 ways.

 However, anyone who does import __init__ (or from . import
 __init__ with relative import) is asking for trouble, I can't think
 of any valid reason to do it, and I wouldn't mind seeing that
 forbidden, but it's simple to avoid.  Someone probably did that
 because they didn't know how to import a containing package from one
 of its modules, failing to realize that it created a new module.


 Carl Banks
 --
 http://mail.python.org/mailman/listinfo/python-list


There are corner cases. The corner case that I ran into was that there
were two ways to find the module on PATH because one value of PATH was
over another. Since then this problem has been removed and it wasn't
too much trouble to work around - but finding the problem was a real
pain.

I am not intimately familiar with the import code and trust your
judgment that it is difficult. If people are in agreement that this
should be changed though it could be put in a list somewhere waiting
for some ambitious person to figure out the implementation, no?

Personally I think it would be worthwhile.

--
Zachary Burns
(407)590-4814
Aim - Zac256FL
Production Engineer (Digital Overlord)
Zindagi Games
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Re: When is divmod(a,b)[0] == floor(a/b)-1 ?

[Robert Kern]

On 2009-09-24 14:40 PM, kj wrote:


The docs for divmod include the following:

 divmod(a, b)
 ...For floating point numbers the result is (q, a % b), where q
 is usually math.floor(a / b) but may be 1 less than that. ...

I know that floating point math can sometimes produce unexpected
results, so the above caveat is not entirely surprising.  Still,
I would find it helpful to see a specific example where
divmod(a, b)[0] is equal to math.floor(a/b)-1.  Does anybody know
one?


In [21]: a = 10.0

In [22]: b = 10.0 / 3.0

In [24]: divmod(a, b)[0]
Out[24]: 2.0

In [25]: math.floor(a / b) - 1.0
Out[25]: 2.0

--
Robert Kern

I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth.
  -- Umberto Eco

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Re: iterate over list while changing it

[Terry Reedy]

Torsten Mohr wrote:

Hello,

a = [1, 2, 3, 4, 5, 6]

for i, x in enumerate(a):


If you change a list while iterating over, start at the tail.

...reversed(enumerate(a))



if x == 3:
a.pop(i)


 del a[i] # you already have the item


continue

if x == 4:
a.push(88)


no such list method, which mean you did not run the above before 
posting. Boo!




print i, i, x, x

I'd like to iterate over a list and change that list while iterating.
I'd still like to work on all items in that list, which is not happening
in the example above.
The conditions in the example are not real but much more complex
in reality.

Can anybody tell me how to do this?


Thanks for any hints,
Torsten.




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Re: Evaluate coding and style

[Ethan Furman]

Brown, Rodrick wrote:

I recently started playing with Python about 3 days now (Ex Perl guy) and 
wanted some input on style and structure of what I'm doing before I really 
start picking up some bad habits here is a simple test tool I wrote to validate 
home dirs on my system.

Please evaluate and let me know what could have been done better. Once again 
this is really my first time using python.


All in all it looks pretty good.  Some minor enhancements...




$ ./homedir_exists.py root mqm pcap
root successful!
Directory: /var/arpwatch not found!

  false negative?

pcap successful!
mqm successful!


$ cat homedir_exists.py
#!/usr/bin/env python

import sys, os
from re import match

userlist = []
filename = '/etc/passwd'

for user in sys.argv[1:]:
  userlist.append(user)


since sys.argv is already a list, you can do
  userlist = sys.argv[1:]


try:
  fh = open(filename)
except IOError:
  print No such filename: %s % (filename)

def checkDir(username):
  data = fh.readlines()
  for line in data:
for user in username:
  if match(user,line):
s = line.split(':')
if not os.path.isdir(s[5]):
  print Directory: %s not found! % (s[5])
print s[0] +  successful!

checkDir(userlist)


passwd has a well defined layout... instead of using re, I would split 
each line into it's component fields, then just match the username 
fields against the usernames passed in... this also avoids the false 
negative shown in your example, and gets rid of one unnecessary loop.


for line in data:
   fields = line.split(':')
   user = fields[0]
   path = fields[5]
   if user in userlist:
  if os.path.isdir(path):
 print %s successfull! % user
  else:
 print Directory %s for user %s not found! % (path, user)

Cheers!

~Ethan~
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Re: When is divmod(a,b)[0] == floor(a/b)-1 ?

[kj]

In mailman.429.1253825725.2807.python-l...@python.org Robert Kern 
robert.k...@gmail.com writes:

On 2009-09-24 14:40 PM, kj wrote:

 The docs for divmod include the following:

  divmod(a, b)
  ...For floating point numbers the result is (q, a % b), where q
  is usually math.floor(a / b) but may be 1 less than that. ...

 I know that floating point math can sometimes produce unexpected
 results, so the above caveat is not entirely surprising.  Still,
 I would find it helpful to see a specific example where
 divmod(a, b)[0] is equal to math.floor(a/b)-1.  Does anybody know
 one?

In [21]: a = 10.0

In [22]: b = 10.0 / 3.0

In [24]: divmod(a, b)[0]
Out[24]: 2.0

In [25]: math.floor(a / b) - 1.0
Out[25]: 2.0

Wow.  To me this stuff is just black magic, with a bit of voodoo
added for good measure...  Maybe some day I'll understand it.

Thanks!

kynn
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urllib, can't seem to get form post right

[Adam W.]

I'm trying to scrape some historical data from NOAA's website, but I
can't seem to feed it the right form values to get the data out of
it.  Heres the code:

import urllib
import urllib2

## The source page http://www.erh.noaa.gov/bgm/climate/bgm.shtml
url = 'http://www.erh.noaa.gov/bgm/climate/pick.php'
values = {'month' : 'July',
  'year' : '1988'}

user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
headers = { 'User-Agent' : user_agent }

data = urllib.urlencode(values)
req = urllib2.Request(url, data, headers)
response = urllib2.urlopen(req)
the_page = response.read()
print the_page
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Re: Doubley imported module caused devastating bug

[Terry Reedy]

Zac Burns wrote:

On Thu, Sep 24, 2009 at 1:38 PM, Carl Banks pavlovevide...@gmail.com wrote:

On Sep 24, 10:26 am, Zac Burns zac...@gmail.com wrote:

Currently it is possible to import a file of one path to more than one
'instance' of a module. One notable example is import __init__ from
a package. 
Seehttp://stackoverflow.com/questions/436497/python-import-the-containin...

This recently caused a devastating bug in some of my code. What I have
is support for the Perforce global options as a context for a perforce
module.http://www.perforce.com/perforce/doc.072/manuals/cmdref/o.gopts.html#...
This way one can call functions that call many perforce command and
have them execute on a different client for example.

So, in module A and module B both imported the Perforce module, but
they turned out not to be the same module. Module A did with
Perforce.GlobalOptions(client=client): B.function()

B.function did not receive the new GlobalOptions because of this
problem. As a result important files on the original client were
overwritten (OUCH).

I would like to propose that it be made impossible in the Python
source to import two instances of the same module.

Impossible's a pretty strong word.

It's a reasonable request, but with Python's importing the way it is
it'd be kind of hard to do.  A Python file can be visible in multiple
ways.

However, anyone who does import __init__ (or from . import
__init__ with relative import) is asking for trouble, I can't think
of any valid reason to do it, and I wouldn't mind seeing that
forbidden, but it's simple to avoid.


/__init__.py is basically an implementation hack to make a directory 
also 'be' a file. Use at one own risk, I say.




There are corner cases. The corner case that I ran into was that there
were two ways to find the module on PATH because one value of PATH was
over another. Since then this problem has been removed and it wasn't
too much trouble to work around - but finding the problem was a real
pain.

I am not intimately familiar with the import code and trust your
judgment that it is difficult. If people are in agreement that this
should be changed though it could be put in a list somewhere waiting
for some ambitious person to figure out the implementation, no?


1. It would slow down all imports, at least a bit.

2. It would kill code that intentionally makes use of duplicate modules 
(but this could be considered exploitation of a bug, perhaps). It would 
also make forced module reloads harder, it not impossible. Currently, 
just delete the entry in sys.modules.


3. The language itself does not specify how and where from an 
implementation 'initializes' a module on first import. Indeed, CPython 
has at least three options (.py, .zip, and .dll or .pyd (Windows)), with 
hooks for more. Lets a take the request as specifically preventing the 
creation of duplicate module objects from a particular .py file.


One implementatin *might* be add a set to sys, say sys.mod_files for 
x.py or x.pyc files already used to initialize a module. The .py or .pyc 
or .pyo would be stripped but the name otherwise should be the absolute 
path. (Including drive letter, on Windows).


This would not cover the case when files are symlinked (or copied). For 
*nix, a set of inode numbers could be used, but not for Windows.  I 
suspect there might be other system-specific problems I have not thought of.


Terry Jan Reedy

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Re: Evaluate coding and style

[Jon Clements]

On 24 Sep, 21:11, Brown, Rodrick  rodrick.br...@citi.com wrote:
 I recently started playing with Python about 3 days now (Ex Perl guy) and 
 wanted some input on style and structure of what I'm doing before I really 
 start picking up some bad habits here is a simple test tool I wrote to 
 validate home dirs on my system.

 Please evaluate and let me know what could have been done better. Once again 
 this is really my first time using python.

 $ ./homedir_exists.py root mqm pcap
 root successful!
 Directory: /var/arpwatch not found!
 pcap successful!
 mqm successful!

 $ cat homedir_exists.py
 #!/usr/bin/env python

 import sys, os
 from re import match

Imports are typically one per line. Personally I'd just use import re,
as re.match isn't too much typing and makes it fairly clear to any
Python programmer it's a regex match (as opposed to a filename match
or wildcard match or other such thing)


 userlist = []
 filename = '/etc/passwd'

I'd probably have filename as FILENAME as it's almost a constant.


 for user in sys.argv[1:]:
   userlist.append(user)

You don't really need to build userlist like this, try:
userlist = sys.argv[1:]




 try:
   fh = open(filename)
 except IOError:
   print No such filename: %s % (filename)


If the file doesn't exist then print it doesn't exist and carry on
regardless anyway? Either re-raise another exception, exit the
program, or don't bother with the try/except and just open the file.
If it doesn't exist, the exception will go unhandled and the program
will stop with the IOError exception.


 def checkDir(username):
   data = fh.readlines()
   for line in data:
     for user in username:
       if match(user,line):
         s = line.split(':')
         if not os.path.isdir(s[5]):
           print Directory: %s not found! % (s[5])
         print s[0] +  successful!


Conventionally the function would be called checkdir or check_dir. I'd
also pass the file object and userlist as parameters instead of
referring to an outer scope.

You don't need the .readlines, just iterate over the fh object as 'for
line in fh'.

'match' is completely the wrong function to use here. A user of 'r'
will match root, roger, etc... etc... Also, as python supports the in
operator, looping each user is unnecessary, something like:

for line in fh:
tokens = line.split(':')
if tokens[0] in userlist:
if not os.path.isdir(tokens[5]):
print 'Directory %s not found' % tokens[5]
else:
print 'User %s successful' % tokens[0]

 checkDir(userlist)

It's fairly traditional to wrap the 'main' function inside a block to
check if this script is the main one that's executing as such:

if __name__ == '__main__':
checkdir(userlist)

This enables the program to be used in an import so that other
programs can use its functions, but will only execute the check
function, if it's the sole script.


hth a bit,
Jon
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Re: urllib, can't seem to get form post right

[Jon Clements]

On 24 Sep, 22:18, Adam W. awasile...@gmail.com wrote:
 I'm trying to scrape some historical data from NOAA's website, but I
 can't seem to feed it the right form values to get the data out of
 it.  Heres the code:

 import urllib
 import urllib2

 ## The source pagehttp://www.erh.noaa.gov/bgm/climate/bgm.shtml
 url = 'http://www.erh.noaa.gov/bgm/climate/pick.php'
 values = {'month' : 'July',
           'year' : '1988'}

 user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
 headers = { 'User-Agent' : user_agent }

 data = urllib.urlencode(values)
 req = urllib2.Request(url, data, headers)
 response = urllib2.urlopen(req)
 the_page = response.read()
 print the_page

Hint:

   select name=month
 option value=/janJanuary/option

 option value=/febFebruary/option
 option value=/marMarch/option
 option value=/aprApril/option
 option value=/mayMay/option
 option value=/junJune/option
 option value=/julJuly/option

 option value=/augAugust/option
 option value=/sepSeptember/option
 option value=/octOctober/option
 option value=/novNovember/option
 option value=/decDecember/option
   /select

Jon.
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Re: Evaluate coding and style

[Rhodri James]

On Thu, 24 Sep 2009 21:11:36 +0100, Brown, Rodrick   
rodrick.br...@citi.com wrote:


I recently started playing with Python about 3 days now (Ex Perl guy)  
and wanted some input on style and structure of what I'm doing before I  
really start picking up some bad habits here is a simple test tool I  
wrote to validate home dirs on my system.


Ethan's made some good points.  Here are a couple more.

[snip]

try:
  fh = open(filename)
except IOError:
  print No such filename: %s % (filename)


IOError could be raised for a couple of reasons, not just because the
file doesn't exist, so your printed message is a bit misleading.  Worse,
because you've caught the exception you'll carry on executing, but
with no open file!  checkDir will then complain, and it will all fall
over in one big, misleading mess.

On the whole, it's probably better not bothering with the try...except
since the default behaviour is likely to be what you want anyway.


def checkDir(username):


PEP 8 (the style guide) suggests that function names should be
lowercase_with_underscores.  It's only a suggestion, mind you.


  data = fh.readlines()


Tsk.  Using the fh as a global variable, rather than passing it as
a parameter?  Slapped wrists all round!

In fact the division between what's in the function and what's not
is rather arbitrary at the moment.  I'd be tempted to move the file
opening into the function it would make it a little easier to convert
this script into a module if you ever wanted to.


  for line in data:
for user in username:
  if match(user,line):
s = line.split(':')
if not os.path.isdir(s[5]):
  print Directory: %s not found! % (s[5])
print s[0] +  successful!


Apart from Ethan's fix, there's another issue here.  You don't
catch the case of a username given on the command line not actually
existing in the password file.  That probably means updating the
username list (which is hard if you're iterating over it at the
time) or creating a list of what's been found as you go, and being
aware of the possibility of duplicates.


checkDir(userlist)


If you're going to stuff everything into a function and then
execute it (not a bad idea at all), then there's another idiom
you should know about.

if __name__ == '__main__':
  checkDir(userlist)

(though in reality again you'd think about what you wanted in
checkDir and bung everything else inside the 'if')

The special variable __name__ contains the name of the current
module.  For a script (executing directly from the command line),
the module name is always __main__.  So when you run
homedir_exists.py from the command line, the condition is true
and your script runs exactly as it does now.

If however you tweak it along the lines I've suggested, you can
use it as a module as well:

-=-=-=-
$ cat trivial_example.py
from homedir_exists import checkDir

# Do something important
checkDir(fred)
# Do something else important
-=-=-=-

In this case, when homedir_exists.py is read in, __name__
will be the name of the module (i.e. homedir_exists) instead
of __main__, so the original checkDir(userlist) won't be
executed.

--
Rhodri James *-* Wildebeest Herder to the Masses
--
http://mail.python.org/mailman/listinfo/python-list

Re: iterate over list while changing it

[Simon Forman]

On Thu, Sep 24, 2009 at 4:32 PM, Torsten Mohr tm...@s.netic.de wrote:
 Hello,

 a = [1, 2, 3, 4, 5, 6]

 for i, x in enumerate(a):
    if x == 3:
        a.pop(i)
        continue

    if x == 4:
        a.push(88)

    print i, i, x, x

 I'd like to iterate over a list and change that list while iterating.

This is generally a bad idea, but you can do it if you're careful.

Let's check that enumerate() works when you append to the underlying list:

In [1]: n = range(3)

In [2]: for i, x in enumerate(n):
   ...: print i, '=', x
   ...: if i  3:
   ...: n.append(23)
   ...:
   ...:
0 = 0
1 = 1
2 = 2
3 = 23
4 = 23
5 = 23

So far so good.  But notice if you delete an item from the list while
iterating over the enumerate object the index returned will still be
incremented on the next iteration and you'll skip the item after the
one you just deleted:

In [1]: n = range(3)

In [2]: for i, x in enumerate(n):
   ...: print i, '=', x, '\t', n
   ...: if i == 1:
   ...: del n[i]
   ...:
   ...:
0 = 0  [0, 1, 2]
1 = 1  [0, 1, 2]

In [3]: n
Out[3]: [0, 2]

In [4]: n = range(6)

In [5]: for i, x in enumerate(n):
   ...: print i, '=', x, '\t', n
   ...: if i == 3:
   ...: del n[i]
   ...:
   ...:
0 = 0  [0, 1, 2, 3, 4, 5]
1 = 1  [0, 1, 2, 3, 4, 5]
2 = 2  [0, 1, 2, 3, 4, 5]
3 = 3  [0, 1, 2, 3, 4, 5]
4 = 5  [0, 1, 2, 4, 5]



 I'd still like to work on all items in that list, which is not happening
 in the example above.
 The conditions in the example are not real but much more complex
 in reality.

 Can anybody tell me how to do this?

You could manage the index yourself, like so:

def f(n):
i = 0
while True:
try:
x = n[i]
except IndexError:
break

print i, '=', x

if x == 3:
del n[i]
continue

if x == 4:
n.append(23)

# Increment the index
# only if you didn't
# delete anything during
# this iteration.
i += 1


N = range(6)
f(N)
print N


This prints:

0 = 0
1 = 1
2 = 2
3 = 3
3 = 4
4 = 5
5 = 23
[0, 1, 2, 4, 5, 23]


HTH,
~Simon


 Thanks for any hints,
 Torsten.


 --
 http://mail.python.org/mailman/listinfo/python-list

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Re: Intercepting binding?

[Rhodri James]

On Thu, 24 Sep 2009 13:39:57 +0100, andrew cooke and...@acooke.org wrote:


On Sep 24, 5:20 am, Steven D'Aprano
ste...@remove.this.cybersource.com.au wrote:

Speaking as a user (although not of Andrew's domain specific language),
I'd like to say to developers PLEASE PLEASE PLEASE don't try to help  
me

with half-baked unreliable solutions that only work sometimes.

There's few things worse than unreliable tools that break just when
you've come to rely on them.


[snip context]


The reason I asked for unreliable half-baked solutions is that I am
exploring what might be possible and, in my experience, this group
prefers to lecture me on what they think I should do rather than
answer the damn question.  I was hoping that by explicitly saying that
reliability is not important, people might feel more free to give
wild ideas that I could learn from and improve on.

It's significant, depressing, and not at all surprising that every
person who replied to this thread told me, in one way or another, that
was I was asking was wrong or impossible or foolhardy.


I did apologise.  I'm now going to recant, because (a) you're being
an arse, and (b) I agree 100% with Steven here.  If a tool is going to
break on my when I need it (i.e. in the complicated cases), I don't
bother using that tool again.

--
Rhodri James *-* Wildebeest Herder to the Masses
--
http://mail.python.org/mailman/listinfo/python-list

Re: iterate over list while changing it

[Rhodri James]

On Thu, 24 Sep 2009 21:32:53 +0100, Torsten Mohr tm...@s.netic.de wrote:


Hello,

a = [1, 2, 3, 4, 5, 6]

for i, x in enumerate(a):
if x == 3:
a.pop(i)
continue

if x == 4:
a.push(88)

print i, i, x, x

I'd like to iterate over a list and change that list while iterating.
I'd still like to work on all items in that list, which is not happening
in the example above.
The conditions in the example are not real but much more complex
in reality.

Can anybody tell me how to do this?


Generally, don't.  It's much less dangerous to create a new list as you
go.

new_a = []
for x in a:
  if x != 3:
new_a.append(x)
  if x == 4:
new_a.append(88)
# or whatever you intended push to mean

If you weren't doing the insertion, you could have used a list
comprehension and neatened things up a bit.

--
Rhodri James *-* Wildebeest Herder to the Masses
--
http://mail.python.org/mailman/listinfo/python-list

Re: Regex trouble

[Rhodri James]

On Thu, 24 Sep 2009 19:45:37 +0100, Simon Forman sajmik...@gmail.com  
wrote:



FWIW this problem is too simple (IMHO) for regular expressions.
Simply carve off the first three digits and check against sets of the
prefixes you're interested in:


#any number starting with these prefixes is not long distance
local_prefixes = set(['832', '877', '888', '713', '866', '011', '001',
'281', '800'])

long_distance= {}
for key1, value1 in x.iteritems():
if key1 == 'dest':
if value1[:3] not in local_prefixes:
long_distance[key1] = value1


You need to allow for the potential leading 1, which can be done with
a bit of straightforward string slicing but still puts REs more
sensibly in the running.

--
Rhodri James *-* Wildebeest Herder to the Masses
--
http://mail.python.org/mailman/listinfo/python-list

Re: Re: Date using input

[flebber . crue]

Okay, thanks for the advice that sounds a good place to start. I used %2.os  
was an attempt to define width and precision to stop typo errors eg the  
user accidentally inputing 101/09/2009 or similar error. So that the  
__/__/ was adhered to.


I will go back to the start get the basics happening and then figure out a  
way to catch errors with format and correctness.


Thanks


On Sep 25, 2009 3:57am, Dave Angel da...@ieee.org wrote:

flebber wrote:




On Sep 24, 11:10 pm, flebber flebber.c...@gmail.com wrote:






On Sep 24, 10:58 pm, Dave Angel da...@ieee.org wrote:












flebber.c...@gmail.com wrote:






I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no



class or instructor, I am learning this myself. I have Hetlands book



Beginning Python Novice to Professional and online documentation



books so Dive into Python, python.org etc.



Using the SPE editor.



I have currently only fully written basic psuedocode to give me a



basic framework to guide myself.



#Basic pseudocode



#Purpose to get raw input and calculate a score for a field of options



and return that



#score in a set in descending order.



#Multiple sets sould be written to the doc



#Obtain date



#Check if txt file with same date exists. If yes apphend to results to



file.



#Obtain location



#Set Dictionary



#Event number



#Obtain set size



#Prompt first entry



#First Entry Number



#First Entry Name



#Set Blocks to obtain and calculate data



#Block 1 example - Placings Block



#Obtain number of events competed in



#Obtain how many times finished first



#Ensure this value is not greater than Number of Events



#Number of Firsts divide by Events * total by 15.



#Obtain Second finishes



#Ensure this value is not greater than Number of Events



#Number of Seconds divide by Events * total by 10.



#Continue On with this



#Block 2 - Lookup coach Dict and apply value.



#Obtain Surname of Coach



#Lookup Coach File and Match Name and get value.



#Blocks continue gaining and calculating values.



#create txt file named using date



#Sum Values Block1 + Block2 etc



#Print to file event number and field with name number individual



Block totals and Sum Total



#Arranged in descending Sum Total.



#Prompt are there any more events? Yes return to start



#Apphend all additional events to same day file seperated by blank line.






How many of these steps have you attempted actually coding? Seems to me



your first two steps are just string manipulation, and you only need to



use the datetime module if you need to validate. In other words, if the



user specifies the date as 31/09/2009, you might want to later bounce



back to him with a complaint that September only has 30 days.



So the first task is to accept input in the form ab/cd/efgh and



produce a string efgh-cd-ab.log which you will then create as a text



file. And if the file exists, you'll append to it instead of



overwriting it. Can you do that much?



DaveA






Trying but haven't got it working, thats why I started to try and use



datetime module.








Surely getting it tottally mixed up





from datetime import date



def ObtainDate(params):



date =aw_input(Type Date dd/mm/year: %2.0r%2.0r/%2.0r%2.0r/%4.0r



%4.0r%4.0r%4.0r)



print date.datetime(year-month-day)



#Check if txt file with same date exists. If yes apphend to results



to file.



date.append(datetime





and





def ObtainDate(params):



date =aw_input(Type Date dd/mm/year: )



date.format =%4.0s%4.0s%4.0s%4.0s-%2.0s%2.0s-%2.0s)



print date.format











As Tim says, first thing you want to do is rename that variable. You've  
defined two symbols with the same name.





Then I'd ask what that %2.0r stuff is inside the prompt to the user.




Do you understand what kind of data is returned by raw_input() ? If so,  
look at the available methods of that type, and see if there's one called  
split() that you can use to separate out the multiple parts of the user's  
response. You want to separate the dd from the mm and from the year.




Once you've split the text, then you want to recombine it in a different  
order, and with dashes between the parts. If I were at your stage of  
experience, I'd not bother with the datetime module at all. Just see if  
you can rebuild the string you need, assuming the user has entered a  
valid 10-character string.





Later you can go back and figure out the datetime logic.





DaveA


-- 
http://mail.python.org/mailman/listinfo/python-list

Re: Regex trouble

[Simon Forman]

On Thu, Sep 24, 2009 at 6:31 PM, Rhodri James
rho...@wildebst.demon.co.uk wrote:
 On Thu, 24 Sep 2009 19:45:37 +0100, Simon Forman sajmik...@gmail.com
 wrote:

 FWIW this problem is too simple (IMHO) for regular expressions.
 Simply carve off the first three digits and check against sets of the
 prefixes you're interested in:


 #any number starting with these prefixes is not long distance
 local_prefixes = set(['832', '877', '888', '713', '866', '011', '001',
 '281', '800'])

 long_distance= {}
 for key1, value1 in x.iteritems():
    if key1 == 'dest':
        if value1[:3] not in local_prefixes:
            long_distance[key1] = value1

 You need to allow for the potential leading 1, which can be done with
 a bit of straightforward string slicing but still puts REs more
 sensibly in the running.

 --
 Rhodri James *-* Wildebeest Herder to the Masses
 --
 http://mail.python.org/mailman/listinfo/python-list


Wow, I was looking right at it ('1?') and I missed it.  I need more sleep.


This is slightly less win:

for key1, value1 in x.iteritems():
   if key1 == 'dest':
   n = value1[0] == '1'
   if value1[n:n + 3] not in local_prefixes:
   long_distance[key1] = value1


(MRAB's comment about the foolishness of iterating through the dict
but testing for key == string_literal still applies, of course.)


Depending on what the OP's doing I might recommend just normalizing
the phone numbers before processing them, (i.e. stripping off the '1's
and possible breaking them up into tuples ('nnn', 'nnn', '').

~Simon
-- 
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Re: PExpect on Windows System Using Cygwin

[Dave Angel]

Kevin Holleran wrote:

Hello,

I downloaded and installed the pexpect module and wrote a script.  All is
well and good, but the script proved to be pretty useful and now I was asked
to run it as a scheduled task up on a server to run periodically.  I was
intending on simply packaging it up with Py2Exe and moving it to the server
that way.

However, when I went to test it, I received this error

Traceback (most recent call last):
  File script.py, line 17, in module
import pexpect
  File lib\site-packages\pexpect.py, line 85, in module
support it. Pexpect is intended for UNIX-like operating systems.)
ImportError: No module named resource

A critical module was not found. Probably this operating system does not
support it. Pexpect is intended for UNIX-like operating systems.

So now I realize that when I was testing on my system, I run cygwin and so
everything worked fine

Is there a .dll that I can copy with it or anything so that it works without
having to install cygwin on the server that will be hosting this scheduled
task?

Thanks for any help.

Kevin

  
Why not just use the subprocess module?   It's built into the Windows 
distribution, and doesn't need cygwin.


DaveA
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Re: Doubley imported module caused devastating bug

[Daniel Stutzbach]

On Thu, Sep 24, 2009 at 2:51 PM, Ethan Furman et...@stoneleaf.us wrote:

 I believe that modules are imported only once


That's *mostly* true, but try this one:

A.py:
print 'Importing A'
import B

B.py:
print 'Importing B'
import A

Cashew:/tmp$ python2.5 B.py
Importing B
Importing A
Importing B

--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC http://stutzbachenterprises.com
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Re: IDE for python similar to visual basic

[J Sisson]

On Sun, Sep 13, 2009 at 6:25 AM, Nobody nob...@nowhere.com wrote:

 On Fri, 11 Sep 2009 05:27:59 -0700, r wrote:



  Sounds like somebody failed to get input
  from their users at design time. Or somebody has the inability to
  relate to their end users.

 You're assuming that there is some right answer which is appropriate for
 all users. There isn't.


I worked for a company that had a team composed of graphic artists, QA
types, etc...that did nothing but draw up GUI's, show them to customers,
revise them, write up runnable dummies of the approved GUI's, performed
usability studies with our customers using the dummy GUI's, and finally
handed the GUI's over to dev so they could put in the guts to make it do
stuff.

Bugs or Cases involving the GUI needing revision because a button needed
to be moved for usability were *extremely* rare, and the GUI didn't require
an additional toolset that allowed end users to tweak them.

-- 
Computers are like air conditioners...
They quit working when you open Windows.
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Re: Date using input

[Sean DiZazzo]

On Sep 24, 7:49 am, flebber flebber.c...@gmail.com wrote:
 On Sep 24, 11:10 pm, flebber flebber.c...@gmail.com wrote:



  On Sep 24, 10:58 pm, Dave Angel da...@ieee.org wrote:

   flebber.c...@gmail.com wrote:
I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no
class or instructor, I am learning this myself. I have Hetlands book
Beginning Python Novice to Professional and online documentation
books so Dive into Python, python.org etc.

Using the SPE editor.

I have currently only fully written basic psuedocode to give me a
basic framework to guide myself.

#Basic pseudocode
#Purpose to get raw input and calculate a score for a field of options
and return that
#score in a set in descending order.
#Multiple sets sould be written to the doc

#Obtain date
#Check if txt file with same date exists. If yes apphend to results to
file.
#Obtain location
#Set Dictionary
#Event number
#Obtain set size
#Prompt first entry
#First Entry Number
#First Entry Name
#Set Blocks to obtain and calculate data
#Block 1 example - Placings Block
#Obtain number of events competed in
#Obtain how many times finished first
#Ensure this value is not greater than Number of Events
#Number of Firsts divide by Events * total by 15.
#Obtain Second finishes
#Ensure this value is not greater than Number of Events
#Number of Seconds divide by Events * total by 10.
#Continue On with this
#Block 2 - Lookup coach Dict and apply value.
#Obtain Surname of Coach
#Lookup Coach File and Match Name and get value.
#Blocks continue gaining and calculating values.
#create txt file named using date
#Sum Values Block1 + Block2 etc
#Print to file event number and field with name number individual
Block totals and Sum Total
#Arranged in descending Sum Total.
#Prompt are there any more events? Yes return to start
#Apphend all additional events to same day file seperated by blank line.

   How many of these steps have you attempted actually coding?  Seems to me
   your first two steps are just string manipulation, and you only need to
   use the datetime module if you need to validate.  In other words, if the
   user specifies the date as 31/09/2009, you might want to later bounce
   back to him with a complaint that September only has 30 days.

   So the first task is to accept input in the form   ab/cd/efgh   and
   produce a string  efgh-cd-ab.log   which you will then create as a text
   file.  And if the file exists, you'll append to it instead of
   overwriting it.   Can you do that much?

   DaveA

  Trying but haven't got it working, thats why I started to try and use
  datetime module.

 Surely getting it tottally mixed up

 from datetime import date
 def ObtainDate(params):
   date = raw_input(Type Date dd/mm/year: %2.0r%2.0r/%2.0r%2.0r/%4.0r
 %4.0r%4.0r%4.0r)
  print date.datetime(year-month-day)
  #Check if txt file with same date exists. If yes apphend to results
 to file.
 date.append(datetime

 and

 def ObtainDate(params):
     date = raw_input(Type Date dd/mm/year: )
     date.format = (%4.0s%4.0s%4.0s%4.0s-%2.0s%2.0s-%2.0s)
     print date.format

I think you are looking for datetime.strptime()

input = raw_input(Type Date dd/mm/year: )
d = datetime.strptime(input, %d/%m/%y)
print d

~Sean
-- 
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Anyone with Experience Using WinTV Capture Cards?

[W. eWatson]

A friend is looking for some help with how to use Python to access a 
WinTV (Go Plus) capture card, and how to display an image from it. Is 
there some facility that might help him, or does anyone have experience 
with such use that might suggest sources?

--
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Re: Evaluate coding and style

[Esmail]

Brown, Rodrick wrote:

I recently started playing with Python about 3 days now (Ex Perl guy) and 
wanted some input on style and structure of what I'm doing before I really 
start picking up some bad habits here is a simple test tool I wrote to validate 
home dirs on my system.

Please evaluate and let me know what could have been done better. Once again 
this is really my first time using python.


You may want to check out pylint ( pychecker)

Esmail

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Re: Re: Re: Date using input

[flebber . crue]

I don't think I am using re.compile properly, but thought as this would  
make my output an object it would be better for later, is that correct?


#Obtain date
def ObtainDate(date):
date = raw_input(Type Date dd/mm/year: )
re.split('[/]+', date)
date
year = date[-1]
month = date[1]
day = date[0]
re.compile('year-month-day')


On Sep 25, 2009 8:32am, flebber.c...@gmail.com wrote:
Okay, thanks for the advice that sounds a good place to start. I  
used %2.os was an attempt to define width and precision to stop typo  
errors eg the user accidentally inputing 101/09/2009 or similar error. So  
that the __/__/ was adhered to.


I will go back to the start get the basics happening and then figure out  
a way to catch errors with format and correctness.



Thanks




On Sep 25, 2009 3:57am, Dave Angel da...@ieee.org wrote:
 flebber wrote:


 On Sep 24, 11:10 pm, flebber flebber.c...@gmail.com wrote:




 On Sep 24, 10:58 pm, Dave Angel da...@ieee.org wrote:










 flebber.c...@gmail.com wrote:




 I am using python 2.6.2, I haven't updated to 3.0 yet. No I have no

 class or instructor, I am learning this myself. I have Hetlands book

 Beginning Python Novice to Professional and online documentation

 books so Dive into Python, python.org etc.

 Using the SPE editor.

 I have currently only fully written basic psuedocode to give me a

 basic framework to guide myself.

 #Basic pseudocode

 #Purpose to get raw input and calculate a score for a field of options

 and return that

 #score in a set in descending order.

 #Multiple sets sould be written to the doc

 #Obtain date

 #Check if txt file with same date exists. If yes apphend to results to

 file.

 #Obtain location

 #Set Dictionary

 #Event number

 #Obtain set size

 #Prompt first entry

 #First Entry Number

 #First Entry Name

 #Set Blocks to obtain and calculate data

 #Block 1 example - Placings Block

 #Obtain number of events competed in

 #Obtain how many times finished first

 #Ensure this value is not greater than Number of Events

 #Number of Firsts divide by Events * total by 15.

 #Obtain Second finishes

 #Ensure this value is not greater than Number of Events

 #Number of Seconds divide by Events * total by 10.

 #Continue On with this

 #Block 2 - Lookup coach Dict and apply value.

 #Obtain Surname of Coach

 #Lookup Coach File and Match Name and get value.

 #Blocks continue gaining and calculating values.

 #create txt file named using date

 #Sum Values Block1 + Block2 etc

 #Print to file event number and field with name number individual

 Block totals and Sum Total

 #Arranged in descending Sum Total.

 #Prompt are there any more events? Yes return to start

 #Apphend all additional events to same day file seperated by blank line.




 How many of these steps have you attempted actually coding? Seems to me

 your first two steps are just string manipulation, and you only need to

 use the datetime module if you need to validate. In other words, if the

 user specifies the date as 31/09/2009, you might want to later bounce

 back to him with a complaint that September only has 30 days.

 So the first task is to accept input in the form ab/cd/efgh and

 produce a string efgh-cd-ab.log which you will then create as a text

 file. And if the file exists, you'll append to it instead of

 overwriting it. Can you do that much?

 DaveA




 Trying but haven't got it working, thats why I started to try and use

 datetime module.






 Surely getting it tottally mixed up



 from datetime import date

 def ObtainDate(params):

 date =aw_input(Type Date dd/mm/year: %2.0r%2.0r/%2.0r%2.0r/%4.0r

 %4.0r%4.0r%4.0r)

 print date.datetime(year-month-day)

 #Check if txt file with same date exists. If yes apphend to results

 to file.

 date.append(datetime



 and



 def ObtainDate(params):

 date =aw_input(Type Date dd/mm/year: )

 date.format =%4.0s%4.0s%4.0s%4.0s-%2.0s%2.0s-%2.0s)

 print date.format










 As Tim says, first thing you want to do is rename that variable. You've  
defined two symbols with the same name.




 Then I'd ask what that %2.0r stuff is inside the prompt to the user.



 Do you understand what kind of data is returned by raw_input() ? If so,  
look at the available methods of that type, and see if there's one called  
split() that you can use to separate out the multiple parts of the user's  
response. You want to separate the dd from the mm and from the year.




 Once you've split the text, then you want to recombine it in a  
different order, and with dashes between the parts. If I were at your  
stage of experience, I'd not bother with the datetime module at all. Just  
see if you can rebuild the string you need, assuming the user has entered  
a valid 10-character string.




 Later you can go back and figure out the datetime logic.



 DaveA

-- 
http://mail.python.org/mailman/listinfo/python-list