ANN: uuid-0.1 Released
uuid is a python module to generate RFC 4122 compatible UUIDs Somehow this module was missing in python, so I took over the struggle with the C sources and all those quirky bits and bytes. Most of them should now be in place to form one of these handy 128 bit identifiers. The module is capable of producing time, random, sha1 and md5 based uuids. For details see: http://home.arcor.de/jurner/python/ -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
[ANN] Firedrop 0.2.0 - The Python Blog Client
It has finally happened, the release of `Firedrop 0.2.0 http://www.voidspace.org.uk/python/firedrop2/`_. The impatient can download the new release here : `Firedrop 0.2.0 (1.3mb) http://www.voidspace.org.uk/cgi-bin/voidspace/downman.py?file=firedrop2-0.2.0.zip`_ .. note:: The first time you run version 0.2.0 it will convert your weblog config file to the new format. **Firedrop2** is the Python blog client with a host of features. These include : * RSS feed generation * Categories * Automatic archive generation * A powerful set of plugins, including spell checker and emailer * Entries can be made in text, HTML, ReST, textile, sextile or markdown markup * HTML templating system and macros for all sorts of tricks * Built in FTP capability for uploading your blog to a server * Because it's written in Python, it is easy to extend Firedrop or create new plugins for it This new release has been made possible by the hard work of `Stewart Midwinter http://www.midtoad.org`_. The changes and new features include : * Firedrop will now start up by opening a default site. * You can set the default site using the GUI. * Main file name changed to ``firedrop.pyw`` * `ConfigObj http://www.voidspace.org.uk/python/configobj.html`_ is now used to edit all the config files. * Full support for all style elements (e.g. underline, bold) in four major markup formats: ReST, Sextile, Textile, Markdown (plus HTML). * New entries are created in a separate dialog that takes care of the markup. * Links are available to websites for the markup styles. * You can reset the app to a null site, and/or delete all entries. * You can force a full build of your site, or just update your site. * You can now create sites serving Article Collections or Items Lists (e.g. FAQs) in addition to Weblogs. * Firedrop2 now runs on Mac OS X and Linux in addition to Windows. * You can view logfile contents using the GUI. * Documentation has been updated to reflect these changes. There is a roadmap for future releases on the `Firedrop2 Trac Site http://firedrop2.python-hosting.com`_. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
PyPy Tokyo sprint 23/4 - 29/4
Tokyo PyPy Sprint: 23rd - 29th April 2006 The next PyPy sprint is scheduled to take place 23rd- 29th April 2006 (Sunday-Saturday) in Akihabara, Tokyo, Japan. We will together with FSIJ (Free Software Initiative of Japan) aim to promote Python and PyPy. We therefor invite Japanese hackers knowledgeable in Python to join our sprint! We'll give newcomer-friendly introductions. To learn more about the new Python-in-Python implementation look here: http://codespeak.net/pypy For this sprint we are particularly interested in meeting and coding on PyPy together with interested Japanese Python hackers. Please register your interest at [EMAIL PROTECTED] as soon as possible and we will help with any questions regarding getting started, pointing to relevant documentation etc. The PyPy team is curious and interested in the experience of hacking code for embedded devices and would love to discuss and get feedback on optimisation efforts and the current state of PyPy. Goals and topics of the sprint -- Possible suggestions for topics are: - Work on gensqueak (our Squeak backend) or possibly other backends. - Implementing Python 2.5 features in PyPy. - Progress further on an 'rctypes' module aiming at letting us use a ctypes implementation of an extension module from the compiled pypy-c. - Writing ctypes implementations of modules to be used by the above tool. - Experimenting and improving performance of our garbage collectors. - Experiment with PyPy flexibility or other aspects of the implementation. - Possibly experiment with writing modules translatable for use both in PyPy and CPython. - Whatever participants want to do with PyPy or particular areas of PyPy (please send suggestions to the mailing list before to allow us to plan and give feedback) Location Accomodation The sprint will be held at National Institute of AIST (National Institute of Advanced Industrial Science and Technology, http://www.aist.go.jp/index_en.html), Akihahabara (the technical gadget district in Tokyo). Yutaka Niibe is our contact person there, helping with arranging facilities. Niibe is the chairman of FSIJ and they have invited us to sprint in Tokyo and we are very grateful for the help and interest we have recieved so far. The facilities we are sprinting in are located here: http://www.gtrc.aist.go.jp/en/access/index.html#Akihabara The actual address is: Akihabara Dai Bldg , 1-18-13 Sotokanda, Chiyoda-ku, Tokyo 101-0021 Japan Phone: +81-3-5298-4729 Hotel areas - we are recommended to book hotels in Ueno and Asakusa (old town), from those areas there are only two metro stops to Akihabara. Please note that hotelrooms in Tokyo are often very small. http://www.wh-rsv.com/english/akihabara/index.html (nearest hotel to sprint location) http://www.greenhotel.co.jp/ochanomizu_e.html http://www.ohgai.co.jp/index-e.html (Ueno) http://www.toyoko-inn.com/e_hotel/00012/index.html (Asakusa) http://www.hotelnewkanda.com/ (second nearest, but no english page) Here is a url for booking hotels with not too unreasonable rates (see map): http://japan-hotelguide.com/hotels/Japan/Tokyo/index.htm For more general tourist information about travelling to Japan and Tokyo - please see: http://www.jnto.go.jp/eng/ http://www.japantravelinfo.com/ (really useful information regarding airfares, hotels, currency, phones etc etc) Comments on the weather: In end April it is ca 20 degrees Celsius. Exact times --- The public PyPy sprint is held Sunday 23rd - Saturday 29th April 2006. Hours will be from 10:00 until people have had enough. It's a good idea to arrive a day before the sprint starts and leave a day later. Sometimes people cannot stay for the whole sprint - you are welcome even if you can only stay for a day or a few days. Sunday: Starting at 10:00. This day is focused on getting to know PyPy enought to start to participate. We will hold a PyPy tutorial and an architectural overview. Planning meeting for the work to be done during the week and grouping of developers (pairs or groups mixing new participants with core developers). Dinner in the evening (Yutaka will arrange a place for us to go to). Monday-Tuesday: Starting at 10:00 with status meetings. Possible regrouping depending on the interest and progress of the various teams. Wednesday: Breakday (coding is allowed although we recommend taking a break). Thursday-Saturday: Starting at 10:00 with status meetings. Possible regrouping depending on the interest and progress of the various teams. Ending on Saturday with a Closure session - summing of the work and planning work to be done until the next sprint. Network, Food, currency We will have access to WiFi at AIST - please make sure you have wlan capabilities.
COM object pointer cast
Hi, I am fooling around with the Python-COM bridge, and I have a little question with that. In the component I am using is a method which will return an Entry object - basically. In truth it returns some object which inherits from entry, and I know which one, but - as said - the method will only return the IEntry interface pointer. Now I would like to cast that one to the one I need :) . Is there an easy way to do it, or do I have to use the QueryInterface-method to get what I want? Greetings thanks in advance, Axel. -- http://mail.python.org/mailman/listinfo/python-list
Re: (not really) randon ideas
[EMAIL PROTECTED] [EMAIL PROTECTED] wrote: regarding the constants, this is more for the vm (and type safety). actually enums, constants and symbols can prolly be implemented more or less the same. Ewww. For some reason, there's just something about the vulgar construct prolly that really irks me, even more than sth for something or proggie for program. You're only saving two keystrokes over the correct word, probably, and because it's split between the hands, probably is probably faster to type. -- - Tim Roberts, [EMAIL PROTECTED] Providenza Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: HIRING: PHP Developer
I apologize. Google groups has restricted our contact email. To reach us, please send your quote to hiringdivision @ gmail.com. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: sending emails to a list of recipients
Gerard Flanagan [EMAIL PROTECTED] wrote:
Kun wrote:
i have the following code:
--
import smtplib
...
msg['Subject'] = 'Purchase Confirmation'
msg ['From'] = From
msg['To'] = emails
s = smtplib.SMTP('.xxx.xxx.edu')
s.login('x','')
s.sendmail(msg['From'], msg['To'], msg.as_string())
s.close()
--
it works if msg['To'] = '[EMAIL PROTECTED]'
however, i'm trying to attach a list of emails named 'emails' to msg['To']
emails is in the following format: ['[EMAIL PROTECTED]', '[EMAIL PROTECTED]',
'[EMAIL PROTECTED]']
anyone have an idea how i can modify this script to work with sending a
list? note this is a snippet of a larger code, 'emails' is as a string
defined earlier.
What did you try? You should just be able to pass the list:
s.sendmail( msg['From'], emails, msg.as_string() )
Or, if you must,
msg['To'] = emails
s.sendmail( msg['From'], msg['To'], msg.as_string() )
It needs to be a list or tuple of individual addresses, e-mail only, with
no nicknames. If you tried that, what did you see?
maybe try : msg['To'] = ', '.join( emails )
taken from:
http://docs.python.org/lib/node597.html
No, you misread the example. It uses that in the headers of the message.
That won't work for the second parameter of SMTP.sendmail.
--
- Tim Roberts, [EMAIL PROTECTED]
Providenza Boekelheide, Inc.
--
http://mail.python.org/mailman/listinfo/python-list
Override default signal handler in interactive shell
Hello everybody, I have written a python script which executes some functions and then returns to the python interactive shell prompt (In other words I use the command #!/usr/bin/python -i in the script's header. In this script I register my own handler for the SIGINT and SIGTERM handlers but when I press Control-C the default handler is invoked and the message KeyboardInterrupt is displayed. If I don't allow the script to return control to the interactive shell, by putting for example an endless loop, then my handler works fine. Does anyone know, how I can make it work in the first case also? Thank you very much. Best Regards Panos -- http://mail.python.org/mailman/listinfo/python-list
Re: sending emails to a list of recipients [update]
Kun [EMAIL PROTECTED] wrote:
Kun wrote:
i have the following code:
--
import smtplib
from email.MIMEText import MIMEText
fp = open('confirmation.txt', 'rb')
msg = MIMEText(fp.read())
From = '[EMAIL PROTECTED]'
msg['Subject'] = 'Purchase Confirmation'
msg ['From'] = From
msg['To'] = emails
s = smtplib.SMTP('.xxx.xxx.edu')
s.login('x','')
s.sendmail(msg['From'], msg['To'], msg.as_string())
s.close()
--
this is my error msg of leaving the code in its current state... (brave
yourself)
Traceback (most recent call last):
File /Tutorial/IMAP/scannermailer.py, line 41, in -toplevel-
s.sendmail(msg['From'], msg['To'], msg.as_string())
File
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/email/Message.py,
line 129, in as_string
g.flatten(self, unixfrom=unixfrom)
...
File
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/email/quopriMIME.py,
line 79, in _max_append
L.append(s.lstrip())
AttributeError: 'list' object has no attribute 'lstrip'
OK, I see what's going on now. The problem is that SMTP.sendmail and
email.MIMEText need two different things.
email.MIMEText sets up the To: header for the body of the e-mail. It is
ONLY used for displaying a result to the human being at the other end, and
like all e-mail headers, must be a single string. (Note that it does not
actually have to have anything to do with the people who actually receive
the message.)
SMTP.sendmail, on the other hand, sets up the envelope of the message for
the SMTP protocol. It needs a Python list of strings, each of which has a
single address.
So, what you need to do is COMBINE the two replies you received. Set
msg['To'] to a single string, but pass the raw list to sendmail:
msg['To'] = ', '.join( emails )
s.sendmail( msg['From'], emails, msg.as_string() )
--
- Tim Roberts, [EMAIL PROTECTED]
Providenza Boekelheide, Inc.
--
http://mail.python.org/mailman/listinfo/python-list
Re: HIRING: PHP Developer
I apologize. Google groups has restricted our contact email. To reach us, please send your quote to hiringdivision @ gmail.com. Thank you. Apologize to whom? Who/What are you replying to? Please note that we don't all use Google groups format your replies properly. Simon -- http://urlkick.com/ Free URL redirection service. Turns a long URL into a much shorter one. -- http://mail.python.org/mailman/listinfo/python-list
Re: __slots__
Op 2006-03-25, John J. Lee schreef [EMAIL PROTECTED]: [EMAIL PROTECTED] (Alex Martelli) writes: [...] you should be using pychecker or pylint [...] I'm curious, as somebody who doesn't regularly use these tools: How do they fit into your workflow? Do you run them every few hours, every day, every time you run functional tests, every release, every so often, on gut feeling about when it's likely to catch problems...? How do you cope with spurious warnings? Does it involve tweaking code to quell warnings? Keeping suppression lists? Maintaining special invocations of pychecker / pylint per-project? Do they cope well with other people's code who do not use these tools? IMO they don't cope well unless you adapt to what they expect. I just tested the two. pylint gave me countless warnings because I use two space to indent instead of four. It also didn't like that I used uppercase letters in my identifiers. That there was no space after a comma or around an operator was a problem too. That I use the same name for the index variable of for loops in different scopes is also warned about. Pychecker also warns about these shadowed variable. Pychecker goes even so far to warn you that a local variable in an imported module is shadowing a global variable of yours. Like the following line: /usr/lib/python2.3/random.py:247: Local variable (i) shadows global defined on line 43 in file demo1a.py So it seems pychecker thinks I shouldn't use something like for i in lst: ... in my code at the global level because some module in the standard library has a function with a local i. Pychecker also froze on my system. I don't recommend the use of these tools. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
XMLRPCServer issues
Hi,
I had some issues with XMLRPCServer and I try to validate my
workaround.
My first try was this (somewhat self explaining code):
from DocXMLRPCServer import DocXMLRPCServer
from cx_Oracle import connect
def get_task_list(user):
sql =
select ISS.ISS_ISSUE_NUMBER
, ISS.ISS_DESCRIPTION
, ISS.C_PC_ISS_STATUS
, ISS.ISS_IN_WORK
, ISS.PC_ISSUES_ID
, DES.GCDTEXT1
from ...
where ...
con = connect('DEVELOP/[EMAIL PROTECTED]')
cur = con.cursor()
cur.execute(sql, USE_NAME = user.upper())
result = cur.fetchall()
cur.close()
con.close()
return result
server = DocXMLRPCServer((localhost, 8000))
server.register_function(get_task_list)
server.serve_forever()
But I had 2 errors with this code:
-PC_ISSUES_ID column could be an integer of 12 digits but the XML
generator only allow 2L**31-1 long integer, so I had an
Overflowexception: long int exceeds XML-RPC.
-Text columns (like ISS_DESCRIPTION) could contains non ascii char.
(éàç) but the server doesn't allow to specify the encoding to use
for the XML, so parser error on non-ascii char. on the client side
(ExpatError: not well-formed (invalid token)).
My working code with workarounds for these issues is:
from DocXMLRPCServer import DocXMLRPCServer
from cx_Oracle import connect
#increase MAXINT constant to allow 12 digits integer for PC_ISSUES_ID
#(long int exceeds XML-RPC exception)
import xmlrpclib
xmlrpclib.MAXINT =
def get_task_list(user):
sql =
select ISS.ISS_ISSUE_NUMBER
, ISS.ISS_DESCRIPTION
, ISS.C_PC_ISS_STATUS
, ISS.ISS_IN_WORK
, ISS.PC_ISSUES_ID
, DES.GCDTEXT1
from ...
where ...
con = connect('DEVELOP/[EMAIL PROTECTED]')
cur = con.cursor()
cur.execute(sql, USE_NAME = user.upper())
result = cur.fetchall()
cur.close()
con.close()
#convert string column to unicode (XML generator does not use
# encoding so string must be UTF8 or unicode)
result = [list(row) for row in result]
for row in result:
for count, x in enumerate(row):
if isinstance(x, str):
row[count] = x.decode('cp1252')
return result
server = DocXMLRPCServer((localhost, 8000))
server.register_function(get_task_list)
server.serve_forever()
But it seems to me not very clean, especially the MAXINT hack.
Has anyone a better solution ?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Menu For The Command Line?
Michael Sperlle wrote: When I bring up the command line interface, it looks like: [EMAIL PROTECTED] Then I type in some command, and it works! But there are lots of commands to type in, and I find it more and more difficult to remember them. This question is not for comp.lang.python. However, for your difficultly google for bash_complete and find some help there. -- Senthil http://puggy.symonds.net/~senthil -- http://mail.python.org/mailman/listinfo/python-list
Re: __slots__
Antoon Pardon wrote: Op 2006-03-25, John J. Lee schreef [EMAIL PROTECTED]: [EMAIL PROTECTED] (Alex Martelli) writes: [...] you should be using pychecker or pylint [...] I'm curious, as somebody who doesn't regularly use these tools: How do they fit into your workflow? Do you run them every few hours, every day, every time you run functional tests, every release, every so often, on gut feeling about when it's likely to catch problems...? How do you cope with spurious warnings? Does it involve tweaking code to quell warnings? Keeping suppression lists? Maintaining special invocations of pychecker / pylint per-project? Do they cope well with other people's code who do not use these tools? IMO they don't cope well unless you adapt to what they expect. I just tested the two. pylint gave me countless warnings because I use two space to indent instead of four. It also didn't like that I used uppercase letters in my identifiers. That there was no space after a comma or around an operator was a problem too. Pylint knows different types of issues, these are code style issues and can be - turned off - configured to what you like. They help getting your coding style consistent and default to PEP8 style. That I use the same name for the index variable of for loops in different scopes is also warned about. Well, everything that _could_ be problematic _or_ confuse a reader is warned about. Pretty good in my eyes. Pychecker also warns about these shadowed variable. Pychecker goes even so far to warn you that a local variable in an imported module is shadowing a global variable of yours. Like the following line: /usr/lib/python2.3/random.py:247: Local variable (i) shadows global defined on line 43 in file demo1a.py That's odd. How are the two modules related? So it seems pychecker thinks I shouldn't use something like for i in lst: ... in my code at the global level because some module in the standard library has a function with a local i. Pychecker also froze on my system. Pychecker imports the modules. Thus these things can happen when a module expects not to be imported as-is. I don't recommend the use of these tools. Well, then I don't recommend anyone reading your code wink Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: Python multithreading problem
thanks guys.I solved the problem by moving self.stdmutex.acquire() before if c5: -- http://mail.python.org/mailman/listinfo/python-list
python -U problem for 2.4.3c1 on Windows 2000 (was Does -U option really exist?)
I did observe the problem when using the -U
option on Windows 2000. Seems like some infinite
recursion in cp1250.py -- see below.
I did not try it with earlier versions of Python.
Can this be reproduced on your computer?
Thanks for your time and experience,
pepr
P.S. Thanks, Martin, for the hint.
Martin v. Löwis wrote
Petr Prikryl wrote:
Martin v. Löwis wrote
As for dropping the u prefix on string literals:
Just try the -U option of the interpreter some time,
which makes all string literals Unicode. If you manage
to get the standard library working this way, you
won't need a per-file decision anymore: just start
your program with 'python -U'.
I have failed to find the -U option in Python 2.4.2.
[...]
$ python2.4 -U
Python 2.4.2 (#2, Sep 30 2005, 21:19:01)
[GCC 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu8)] on linux2
Type help, copyright, credits or license for more information.
type()
type 'unicode'
^D
[...]
On Windows machine
C:\python -U
'import site' failed; use -v for traceback
Python 2.4.3c1 (#68, Mar 23 2006, 10:19:27) [MSC v.1310 32 bit (Intel)] on win32
Type help, copyright, credits or license for more information.
type('')
type 'unicode'
^Z
See the 'import site' failure. I do use the sitecustomize.py
(C:\Python24\Lib\site-packages\sitecustomize.py). It contains
-
import sys
sys.setdefaultencoding('cp1250')
-
I did remove the sitecustomize.pyc before the command.
When trying the python -U -v 2xxx.log, I get the
following (shortened):
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# C:\Python24\lib\site.pyc matches C:\Python24\lib\site.py
import site # precompiled from C:\Python24\lib\site.pyc
# C:\Python24\lib\os.pyc matches C:\Python24\lib\os.py
import os # precompiled from C:\Python24\lib\os.pyc
import nt # builtin
# C:\Python24\lib\ntpath.pyc matches C:\Python24\lib\ntpath.py
import ntpath # precompiled from C:\Python24\lib\ntpath.pyc
# C:\Python24\lib\stat.pyc matches C:\Python24\lib\stat.py
import stat # precompiled from C:\Python24\lib\stat.pyc
# C:\Python24\lib\UserDict.pyc matches C:\Python24\lib\UserDict.py
import UserDict # precompiled from C:\Python24\lib\UserDict.pyc
# C:\Python24\lib\copy_reg.pyc matches C:\Python24\lib\copy_reg.py
import copy_reg # precompiled from C:\Python24\lib\copy_reg.pyc
# C:\Python24\lib\types.pyc matches C:\Python24\lib\types.py
import types # precompiled from C:\Python24\lib\types.pyc
# C:\Python24\lib\locale.pyc matches C:\Python24\lib\locale.py
import locale # precompiled from C:\Python24\lib\locale.pyc
import _locale # builtin
# C:\Python24\lib\codecs.pyc matches C:\Python24\lib\codecs.py
import codecs # precompiled from C:\Python24\lib\codecs.pyc
import _codecs # builtin
import encodings # directory C:\Python24\lib\encodings
# C:\Python24\lib\encodings\__init__.pyc matches
C:\Python24\lib\encodings\__init__.py
import encodings # precompiled from C:\Python24\lib\encodings\__init__.pyc
# C:\Python24\lib\encodings\aliases.pyc matches
C:\Python24\lib\encodings\aliases.py
import encodings.aliases # precompiled from
C:\Python24\lib\encodings\aliases.pyc
# C:\Python24\lib\encodings\cp1250.pyc matches
C:\Python24\lib\encodings\cp1250.py
import encodings.cp1250 # precompiled from C:\Python24\lib\encodings\cp1250.pyc
import sitecustomize # from C:\Python24\lib\site-packages\sitecustomize.py
# wrote C:\Python24\lib\site-packages\sitecustomize.pyc
'import site' failed; traceback:
Traceback (most recent call last):
File C:\Python24\lib\site.py, line 397, in ?
main()
File C:\Python24\lib\site.py, line 394, in main
if hasattr(sys, setdefaultencoding):
File C:\Python24\lib\encodings\cp1250.py, line 18, in encode
return codecs.charmap_encode(input,errors,encoding_map)
File C:\Python24\lib\encodings\cp1250.py, line 18, in encode
return codecs.charmap_encode(input,errors,encoding_map)
File C:\Python24\lib\encodings\cp1250.py, line 18, in encode
return codecs.charmap_encode(input,errors,encoding_map)
[...snip...]
File C:\Python24\lib\encodings\cp1250.py, line 18, in encode
return codecs.charmap_encode(input,errors,encoding_map)
File C:\Python24\lib\encodings\cp1250.py, line 18, in encode
return codecs.charmap_encode(input,errors,encoding_map)
RuntimeError: maximum recursion depth exceeded
# C:\Python24\lib\warnings.pyc matches C:\Python24\lib\warnings.py
import warnings # precompiled from C:\Python24\lib\warnings.pyc
# C:\Python24\lib\linecache.pyc matches C:\Python24\lib\linecache.py
import linecache # precompiled from C:\Python24\lib\linecache.pyc
Python 2.4.3c1 (#68, Mar 23 2006, 10:19:27) [MSC v.1310 32 bit (Intel)] on win32
Type help, copyright, credits or license for more information.
# clear __builtin__._
# clear sys.path
# clear sys.argv
# clear sys.ps1
# clear sys.ps2
# clear sys.exitfunc
# clear sys.exc_type
# clear sys.exc_value
# clear
Difference between 'is' and '=='
Hey guys, this maybe a stupid question, but I can't seem to find the result anywhere online. When is the right time to use 'is' and when should we use '=='? Thanks alot~ -- http://mail.python.org/mailman/listinfo/python-list
Re: datetime iso8601 string input
Could [RFC 3339] be a candidate for a default consumption format for date-time strings? +1 -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
mwql: Hey guys, this maybe a stupid question, but I can't seem to find the result anywhere online. When is the right time to use 'is' and when should we use '=='? http://docs.python.org/ref/comparisons.html -- René Pijlman -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
mwql wrote: Hey guys, this maybe a stupid question, but I can't seem to find the result anywhere online. When is the right time to use 'is' and when should we use '=='? is is like id(obj1) == id(obj2) 100+1 == 101 True 100+1 is 101 False They don't have the same id. (Think of id as memory adresses.) -- hilsen/regards Max M, Denmark http://www.mxm.dk/ IT's Mad Science Phone: +45 66 11 84 94 Mobile: +45 29 93 42 96 -- http://mail.python.org/mailman/listinfo/python-list
Re: __slots__
Op 2006-03-27, Georg Brandl schreef [EMAIL PROTECTED]: Antoon Pardon wrote: Op 2006-03-25, John J. Lee schreef [EMAIL PROTECTED]: [EMAIL PROTECTED] (Alex Martelli) writes: [...] you should be using pychecker or pylint [...] I'm curious, as somebody who doesn't regularly use these tools: How do they fit into your workflow? Do you run them every few hours, every day, every time you run functional tests, every release, every so often, on gut feeling about when it's likely to catch problems...? How do you cope with spurious warnings? Does it involve tweaking code to quell warnings? Keeping suppression lists? Maintaining special invocations of pychecker / pylint per-project? Do they cope well with other people's code who do not use these tools? IMO they don't cope well unless you adapt to what they expect. I just tested the two. pylint gave me countless warnings because I use two space to indent instead of four. It also didn't like that I used uppercase letters in my identifiers. That there was no space after a comma or around an operator was a problem too. Pylint knows different types of issues, these are code style issues and can be - turned off - configured to what you like. They help getting your coding style consistent and default to PEP8 style. I have been on their website in the documentation section and found nothing that could easily help me here. That I use the same name for the index variable of for loops in different scopes is also warned about. Well, everything that _could_ be problematic _or_ confuse a reader is warned about. Pretty good in my eyes. No it isn't. If most of these line are in fact not problematic or confusing at all then people will in general no longer take notice of those kind of lines. If I use a specific variable like i only as an index in for loops, there is no reason to think this is problematic or confusing even if those loops are in different scopes. And all those lines reporting something that is not a problem will detract from the few lines that may be a real problem. Pychecker also warns about these shadowed variable. Pychecker goes even so far to warn you that a local variable in an imported module is shadowing a global variable of yours. Like the following line: /usr/lib/python2.3/random.py:247: Local variable (i) shadows global defined on line 43 in file demo1a.py That's odd. How are the two modules related? the program demo1a.py contains the following line: from random import Random, randint, sample So it seems pychecker thinks I shouldn't use something like for i in lst: ... in my code at the global level because some module in the standard library has a function with a local i. Pychecker also froze on my system. Pychecker imports the modules. Thus these things can happen when a module expects not to be imported as-is. I still find it unacceptable. -- Antoon Pardon -- http://mail.python.org/mailman/listinfo/python-list
Re: XMLRPCServer issues
1. Is there on option to get cx_Oracle to return string data as unicode rather than strings objects? XML-RPC aside, dealing with unicode objects might be better than dealing with encoded strings. 2. You might want to transmit integers as strings rather than use the XML-RPC integer type (which is limited to numbers between -2147483648 and 2147483647). Cheers, Brian -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
mwql wrote:
Hey guys, this maybe a stupid question, but I can't seem to find the
result anywhere online. When is the right time to use 'is' and when
should we use '=='?
Thanks alot~
'==' is the equality operator. It is used to test if two objects are
'equal'.
'is' is the identity operator, it is used to test if two
names/references point to the same object.
a = {'a': 3}
b = {'a': 3}
a == b
True
a is b
False
c = a
a is c
True
The two dictionaries a and b are equal, but are separate objects.
(Under the hood, Python uses 'id' to determine identity).
When you bind another name 'c' to point to dictionary a, they *are* the
same object - so a *is* c.
One place the 'is' operator is commonly used is when testing for None.
You only ever have one instance of 'None', so
a is None
is quicker than
a == None
(It only needs to check identity not value.)
I hope that helps.
Fuzzyman
http://www.voidspace.org.uk/python/index.shtml
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Properties
Is there a way of checking whether the call to a set-function is called from within the class, e.g. the __init__() contra object.set()? Thanks. Ronny Mandal -- http://mail.python.org/mailman/listinfo/python-list
Re: New development windows, IronPython or PythonWin
Thanks to all, my main concern about anything Microsoft picks up and runs with is that they vear off just slightly from the standard and freeze everyone else out like they have done with their browser, javascript etc.. etc... etc... So for now I will try to use Python / PythonWin with the COM support. Dan -- http://mail.python.org/mailman/listinfo/python-list
Re: New development windows, IronPython or PythonWin
Dan wrote: Thanks to all, my main concern about anything Microsoft picks up and runs with is that they vear off just slightly from the standard and freeze everyone else out like they have done with their browser, javascript etc.. etc... etc... So for now I will try to use Python / PythonWin with the COM support. Dan I shouldn't think that Jim Hugunin will divert from the standard. In fact he's even been asking on Python-Dev whether they should replicate the bugs in Python 2.4 or stick with the documented behaviour ! Jim is in charge of the project and was the lead developer behind Jython - so he literally knows Python inside out. Anyway - PythoNWin and COM may well be the right approach for your problem anyway. :-) Fuzzyman http://www.voidspace.org.uk/python/index.shtml -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL image size reduction script
nikie wrote: Philippe Martin wrote: Hi, Thanks to the NG, I got the script hereunder working. 1) I am not certain that the call to convert does much (checking the doc) I think you only need it if your source image comes in a format that can't be stored into a jpeg file (e.g. 8-bit paletted). You'll need that if you're converting from GIF files, for example. It shouldn't hurt otherwise. OK 2) Can this be improved as far as the final image size in (X,Y) ? I'm not sure if I get you: You tell the image object it's new (X,Y)-size in the resize method, don't you? Yes, I keep reducing the (X,Y) size as long as the file is too large (in bytes) For instance, passing a large .jpg with a target byte size of 7000, I get final (X,Y) results around (213, 174) ... but might want to strech it a bit while keeping the byte size. If I got you right, you want to compress the image to a certain file size. Maybe you should try optimizing the additional save parameters for the jpeg encoder. (http://www.pythonware.com/library/pil/handbook/formats.htm). Try reducing the quality parameter. l_image.save(l_tmp_file_name, quality=25) That might be it !!! Thanks, Philippe Hope this helps. Niki -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL image size reduction script
PS: where can I find those extra parameters in the doc (ex: quality) ... I must be blind. Philippe nikie wrote: Philippe Martin wrote: Hi, Thanks to the NG, I got the script hereunder working. 1) I am not certain that the call to convert does much (checking the doc) I think you only need it if your source image comes in a format that can't be stored into a jpeg file (e.g. 8-bit paletted). You'll need that if you're converting from GIF files, for example. It shouldn't hurt otherwise. 2) Can this be improved as far as the final image size in (X,Y) ? I'm not sure if I get you: You tell the image object it's new (X,Y)-size in the resize method, don't you? For instance, passing a large .jpg with a target byte size of 7000, I get final (X,Y) results around (213, 174) ... but might want to strech it a bit while keeping the byte size. If I got you right, you want to compress the image to a certain file size. Maybe you should try optimizing the additional save parameters for the jpeg encoder. (http://www.pythonware.com/library/pil/handbook/formats.htm). Try reducing the quality parameter. l_image.save(l_tmp_file_name, quality=25) Hope this helps. Niki -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
is is like id(obj1) == id(obj2) snip (Think of id as memory adresses.) Which means that is comparisons in general will be faster than == comparisons. According to PEP8 (python programming style guidelines) you should use 'is' when comparing to singletons like None. I take this to also include constants and such. That allows us to take short cuts through known terrain, such as in the massive_computations function below: -- import time class LotsOfData(object): def __init__(self, *data): self.data = data def __eq__(self, o): time.sleep(2) # time consuming computations... return self.data == o.data KNOWN_DATA = LotsOfData(1,2) same_data = KNOWN_DATA equal_data = LotsOfData(1,2) other_data = LotsOfData(2,3) def massive_computations(data = KNOWN_DATA): if data is KNOWN_DATA: return very quick answer elif data == KNOWN_DATA: return quick answer else: time.sleep(10) # time consuming computations... return slow answer print Here we go! print massive_computations() print massive_computations(same_data) print massive_computations(equal_data) print massive_computations(other_data) print Done. -- Cheers, Joel -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
In article [EMAIL PROTECTED], Joel Hedlund [EMAIL PROTECTED] wrote: Which means that is comparisons in general will be faster than == comparisons. I thought that == automatically compared identify before trying to compare the values. Or am I thinking of some special case, like strings? -- http://mail.python.org/mailman/listinfo/python-list
Re: For loop and list comprehension similarity
I think I like generator comprehension in this case better than either list comprehension or a filter because both of the latter create a new full result list before the loop even begins. At least I suppose they do. Also, I think Mitja's suggestion if not test: continue and Terry's filter function are more readable than comprehensions. It's not a contest though :-), all these variants are great, thank you all! Do you think this discussion is a proof that the following principle got violated, or do you think that loop with condition is not such an atomic thing to be subject to this: There should be one -- and preferably only one -- obvious way to do it. Cheers, Sergey. -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Roy Smith wrote: In article [EMAIL PROTECTED], Joel Hedlund [EMAIL PROTECTED] wrote: Which means that is comparisons in general will be faster than == comparisons. I thought that == automatically compared identify before trying to compare the values. Or am I thinking of some special case, like strings? You must be thinking of a special case: class A: ... def __cmp__(self, other): return 1 ... a = A() a is a True a == a False -Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Properties
Ronny Mandal wrote:
Is there a way of checking whether the call to a set-function is
called from within the class, e.g. the __init__() contra
object.set()?
import inspect
help(inspect.stack)
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
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Re: Difference between 'is' and '=='
Roy Smith wrote:
In article [EMAIL PROTECTED],
Joel Hedlund [EMAIL PROTECTED] wrote:
Which means that is comparisons in general will be faster than ==
comparisons.
I thought that == automatically compared identify before trying to compare
the values. Or am I thinking of some special case, like strings?
Even for strings there is a performance difference:
timeit.Timer('a'=='a').timeit()
0.26859784126281738
timeit.Timer('a' is 'a').timeit()
0.21730494499206543
mfg
- eth
--
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Re: PIL image size reduction script
Philippe Martin wrote: PS: where can I find those extra parameters in the doc (ex: quality) ... I must be blind. In the http://www.pythonware.com/library/pil/handbook/formats.htm page. Look in the JPEG section. Different file formats support different options. -- http://mail.python.org/mailman/listinfo/python-list
Re: What's the best way to learn perl for a python programmer?
Hello vj
I'll try and do as much as possible in pexpect but am sure I'll have do
some significant perl. Any suggestions on what is the best way to get
upto speed on perl?
Perl is (imho) much more complex and
somehow more powerful than Python
(if you can handle it) - it has more
development iterations behind it plus
a large contibuting community - and
their bear's den (CPAN) -- which
will probably save your project some-
times from debris falling around you.
BUT! There is no problem in using
a subset of Perl (called Baby-Perl)
that allows you translating your
Perl Scripts to Python by omitting $$
and { }, replace 'sub' by 'def'
(plus some minor modifications).
There is a nice comparison on Python
and Perl available on the Web, which gave
me a good laugh for more than 30 seconds ;-))
http://www.adequacy.org/stories/2001.12.20.165434.32.html
(too bad - most responders didn't get the point of it)
Regards,
M.
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Re: Advice for Python and Web Server/Services?
On Sunday 26 March 2006 5:00 pm, Dennis Lee Bieber wrote: Any possibility you need to specify an option on the socket connections to reuse-sockets without the normal time-out? The problem turned out to be keep-alive. Apparently, Comcast is limiting my inbound connections. Apache keeps the connections alive so it works fine. The Python servers don't support keep-alive and are using up the available connections too quickly. I'm now using Apache as a proxy to the Python server and it works well. Thanks for the response. On Sun, 26 Mar 2006 14:55:12 -0500, Ron Davis [EMAIL PROTECTED] declaimed the following in comp.lang.python: I've looked in to fastcgi and mod_python but I'm not sure either is what I need. What I want is for my Python program to be polling the web services 24/7 and Apache to serve static pages by itself but call a function in my already running Python program for files with a certain extension (.xml for example). I think you'll first need to disconnect the two sides... The program doing the polling has to run completely stand-alone from your own web-server. I also think you'll need to create some independent (file-system?) store which the polling program can write to; so your web server page can do the selected retrieval -- but since you don't want a database capable of concurrent access... The polling program needs to include an asynchronous or threaded scheme with a local socket so the web server (CGI) process can connect to it and requests the poller to return the data. Ideally, I'd like to figure out why the Python servers are having problems. This is a very low volume system so straight Python would be great if I can get it working. Any possibility you need to specify an option on the socket connections to reuse-sockets without the normal time-out? -- == [EMAIL PROTECTED] | Wulfraed Dennis Lee Bieber KD6MOG [EMAIL PROTECTED] | Bestiaria Support Staff == Home Page: http://www.dm.net/~wulfraed/ Overflow Page: http://wlfraed.home.netcom.com/ -- Ron Davis Custom Software Engineering -- http://mail.python.org/mailman/listinfo/python-list
Re: Nevow LivePage tutorial
On 26 Mar 2006 23:12:33 -0800, Mir Nazim [EMAIL PROTECTED] wrote: Hello, Can any one direct me to some tutorials for: 1. Nevow LivePage http://divmod.org/trac/wiki/DivmodNevow/Athena http://divmod.org/trac/browser/trunk/Nevow/examples/athenademo 2. Form handling in Nevow http://divmod.org/trac/browser/trunk/Nevow/examples/formbuilder http://forms-project.pollenation.net/cgi-bin/trac.cgi Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Python, equivalent of set command
In unix shell script I can do the following to get the status and values returned by a unix command OUTPUT=`some unix command` STATUS=$? if [ $STATUS -ne 0 ] then exit 1 else set $OUTPUT VAL1=$1 VAL2=$2 VAL3=$3 fi How can I achieve the same in python? I know how to run it via the os.system command and return the status, but how do I return the values too? -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
On Mon, 27 Mar 2006 14:52:46 +0200, Joel Hedlund [EMAIL PROTECTED] wrote: ... According to PEP8 (python programming style guidelines) you should use 'is' when comparing to singletons like None. I take this to also include constants and such ... This does *not* also mean constants and such: Python 2.4.2 (#1, Feb 22 2006, 08:02:53) [GCC 4.0.1 (Apple Computer, Inc. build 5247)] on darwin Type help, copyright, credits or license for more information. a = 123456789 a == 123456789 True a is 123456789 False Regards, Dan -- Dan Sommers http://www.tombstonezero.net/dan/ I wish people would die in alphabetical order. -- My wife, the genealogist -- http://mail.python.org/mailman/listinfo/python-list
Re: Python types
Dennis Lee Bieber wrote:
On Mon, 27 Mar 2006 01:34:14 +0200, Bruno Desthuilliers
[EMAIL PROTECTED] declaimed the following in
comp.lang.python:
Ok, so even if Python itself declares b and b2 (read: objects that names
b and b2 are bound to) to be of the same type, you cannot apply the
myop() operation on b2...
Try looking at class-based objects as a form of CONTAINER...
ouch, my ears :(
Two
containers can be of the same type, but the contents may be different.
(snip)
This is mostly how OO is implemented in Python (in javascript too FWIW)
- but this is not the semantic of classes/objects in OO. The OO
translation of a type - at least according to the definition proposed by
the OP, and this is a pretty common definition - is a set of attributes
and methods. In most OO languages, this set is fixed for *all* the
instances of a class (subclassing not withstanding - and subclassing is
already a not so trivial problem in type theory).
What I wanted to point out is that, while class-based, Python in, in
this respect, closer to a prototype-based language.
In fact, since the set of attributes and methods of a given object may
change during the object's lifetime, it's type(s) may change too. So
saying that objects in Python have a perfectly defined type is perhaps
not really accurate, or at least requires further precisions (well, IMHO)
And I didn't even mention the possibility of changing the value of
anobject.__class__ at runtime !-)
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
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Re: Difference between 'is' and '=='
It's really strange, if a = 1 b = 1 a is b == True the same thing applies for strings, but not for dict, lists or tuples I think the 'is' operator is useful for objects only, not for primitive types, I think I solved the mystery behind my bugged code =) -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL image size reduction script
Many thanks nikie wrote: Philippe Martin wrote: PS: where can I find those extra parameters in the doc (ex: quality) ... I must be blind. In the http://www.pythonware.com/library/pil/handbook/formats.htm page. Look in the JPEG section. Different file formats support different options. -- http://mail.python.org/mailman/listinfo/python-list
Re: Nevow LivePage tutorial
Jean-Paul Calderone wrote: On 26 Mar 2006 23:12:33 -0800, Mir Nazim [EMAIL PROTECTED] wrote: 2. Form handling in Nevow http://divmod.org/trac/browser/trunk/Nevow/examples/formbuilder http://forms-project.pollenation.net/cgi-bin/trac.cgi Jean-Paul And http://divmod.org/trac/wiki/DivmodNevow/FormHandling Tim Parkin -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
mwql wrote: It's really strange, if a = 1 b = 1 a is b == True the same thing applies for strings Not quite: 'abc' is 'abc' True 'abc' is 'ab' + 'c' False -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: XMLRPCServer issues
Brian Quinlan wrote: 1. Is there on option to get cx_Oracle to return string data as unicode rather than strings objects? XML-RPC aside, dealing with unicode objects might be better than dealing with encoded strings. I don't think cx_Oracle can return unicode string, so my code to convert string is not so bad. 2. You might want to transmit integers as strings rather than use the XML-RPC integer type (which is limited to numbers between -2147483648 and 2147483647). Is it a limit of XML-RPC RFC or a limit (probably with a good reason) of the python xmlrpclib ? Thanks for your answer. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python, equivalent of set command
loial In unix shell script I can do the following to get the status and loial values returned by a unix command loial OUTPUT=`some unix command` loial STATUS=$? loial if [ $STATUS -ne 0 ] loial then loial exit 1 loial else loial set $OUTPUT loial VAL1=$1 loial VAL2=$2 loial VAL3=$3 loial fi loial How can I achieve the same in python? I'm not much of a shell programmer, but it looks like you want something like: import os pipe = os.popen(some unix command) result = pipe.read() status = pipe.close() if not status: # but see below... val1, val2, val3 = result.split() Read up on the os.popen function to get the details of what's in the status variable. I think the exit status might be in the upper eight bits, but I don't remember off the top of my head. That will affect the test. Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Dan Sommers wrote: This does *not* also mean constants and such: Python 2.4.2 (#1, Feb 22 2006, 08:02:53) [GCC 4.0.1 (Apple Computer, Inc. build 5247)] on darwin Type help, copyright, credits or license for more information. a = 123456789 a == 123456789 True a is 123456789 False It's strange: python seem to cache constants from 0 to 99: for x in xrange(1000): if not eval(%d%x) is eval(%d%x): print x for me it printed 100-999. - eth -- http://mail.python.org/mailman/listinfo/python-list
Re: MVC in Python for web app dev
[EMAIL PROTECTED] wrote:
I'm aware that Pylons is trying to
compete with Rails in the near future but I'm just not clear on how
directly they are trying to compete...will Pylons have the same
generation functions and other time saving goodies that RoR has or am I
barking up the wrong tree?
Thanks for the reference to Pylon:
http://pylonshq.com/
I had not heard of it before and it looks promising.
Have you asked your questions ('the same generation functions and other
time saving goodies') of the Pylon folks?
Don.
--
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Re: Module documentation
Bruno Desthuilliers wrote: In the python shell, typing 'help(symbol)' should get you started most of the time. And honestly, it should work all of the time. If it doesn't, file a bug report. I can't stand it when that doesn't work. Some of us don't do all of our work with a browser handy, and a net connection. Mike -- http://mail.python.org/mailman/listinfo/python-list
Re: For loop and list comprehension similarity
[EMAIL PROTECTED] wrote: Do you think this discussion is a proof that the following principle got violated, or do you think that loop with condition is not such an atomic thing to be subject to this: There should be one -- and preferably only one -- obvious way to do it. Mitja's suggestion was the one obvious way. The others are all interesting, maybe even preferable in some cases, but I don't think most experienced Python programmers would be more likely to start with one of them than with the simple for-loop-with-explicit-test. -Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Em Seg, 2006-03-27 às 08:23 -0500, Dan Sommers escreveu: On Mon, 27 Mar 2006 14:52:46 +0200, Joel Hedlund [EMAIL PROTECTED] wrote: ... According to PEP8 (python programming style guidelines) you should use 'is' when comparing to singletons like None. I take this to also include constants and such ... This does *not* also mean constants and such: Python 2.4.2 (#1, Feb 22 2006, 08:02:53) [GCC 4.0.1 (Apple Computer, Inc. build 5247)] on darwin Type help, copyright, credits or license for more information. a = 123456789 a == 123456789 True a is 123456789 False Not those kind of constants, but this one: Python 2.4.2 (#2, Nov 20 2005, 17:04:48) [GCC 4.0.3 2005 (prerelease) (Debian 4.0.2-4)] on linux2 Type help, copyright, credits or license for more information. CONST = 123456789 a = CONST a == CONST True a is CONST True -- Felipe. -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
mwql wrote: It's really strange, if a = 1 b = 1 a is b == True the same thing applies for strings, but not for dict, lists or tuples I think the 'is' operator is useful for objects only, not for primitive types, I think I solved the mystery behind my bugged code =) The reason that is works for small numbers is that these are cached for performance reasons. Try a = 100 b = 100 a is b False So - your conclusion is basically right: use is on (complex) objects, not on numbers and strings and other built-ins. The exception from the rule is None - that should only exist once, so foo is not None is considered better style than foo == None. Diez -- http://mail.python.org/mailman/listinfo/python-list
Next PyPy Sprint: Tokyo 23/4 - 29/4
Tokyo PyPy Sprint: 23rd - 29th April 2006 The next PyPy sprint is scheduled to take place 23rd- 29th April 2006 (Sunday-Saturday) in Akihabara, Tokyo, Japan. We will together with FSIJ (Free Software Initiative of Japan) aim to promote Python and PyPy. We therefor invite Japanese hackers knowledgeable in Python to join our sprint! We'll give newcomer-friendly introductions. To learn more about the new Python-in-Python implementation look here: http://codespeak.net/pypy For this sprint we are particularly interested in meeting and coding on PyPy together with interested Japanese Python hackers. Please register your interest at [EMAIL PROTECTED] as soon as possible and we will help with any questions regarding getting started, pointing to relevant documentation etc. The PyPy team is curious and interested in the experience of hacking code for embedded devices and would love to discuss and get feedback on optimisation efforts and the current state of PyPy. Goals and topics of the sprint -- Possible suggestions for topics are: - Work on gensqueak (our Squeak backend) or possibly other backends. - Implementing Python 2.5 features in PyPy. - Progress further on an 'rctypes' module aiming at letting us use a ctypes implementation of an extension module from the compiled pypy-c. - Writing ctypes implementations of modules to be used by the above tool. - Experimenting and improving performance of our garbage collectors. - Experiment with PyPy flexibility or other aspects of the implementation. - Possibly experiment with writing modules translatable for use both in PyPy and CPython. - Whatever participants want to do with PyPy or particular areas of PyPy (please send suggestions to the mailing list before to allow us to plan and give feedback) Location Accomodation The sprint will be held at National Institute of AIST (National Institute of Advanced Industrial Science and Technology, http://www.aist.go.jp/index_en.html), Akihahabara (the technical gadget district in Tokyo). Yutaka Niibe is our contact person there, helping with arranging facilities. Niibe is the chairman of FSIJ and they have invited us to sprint in Tokyo and we are very grateful for the help and interest we have recieved so far. The facilities we are sprinting in are located here: http://www.gtrc.aist.go.jp/en/access/index.html#Akihabara The actual address is: Akihabara Dai Bldg , 1-18-13 Sotokanda, Chiyoda-ku, Tokyo 101-0021 Japan Phone: +81-3-5298-4729 Hotel areas - we are recommended to book hotels in Ueno and Asakusa (old town), from those areas there are only two metro stops to Akihabara. Please note that hotelrooms in Tokyo are often very small. http://www.wh-rsv.com/english/akihabara/index.html (nearest hotel to sprint location) http://www.greenhotel.co.jp/ochanomizu_e.html http://www.ohgai.co.jp/index-e.html (Ueno) http://www.toyoko-inn.com/e_hotel/00012/index.html (Asakusa) http://www.hotelnewkanda.com/ (second nearest, but no english page) Here is a url for booking hotels with not too unreasonable rates (see map): http://japan-hotelguide.com/hotels/Japan/Tokyo/index.htm For more general tourist information about travelling to Japan and Tokyo - please see: http://www.jnto.go.jp/eng/ http://www.japantravelinfo.com/ (really useful information regarding airfares, hotels, currency, phones etc etc) Comments on the weather: In end April it is ca 20 degrees Celsius. Exact times --- The public PyPy sprint is held Sunday 23rd - Saturday 29th April 2006. Hours will be from 10:00 until people have had enough. It's a good idea to arrive a day before the sprint starts and leave a day later. Sometimes people cannot stay for the whole sprint - you are welcome even if you can only stay for a day or a few days. Sunday: Starting at 10:00. This day is focused on getting to know PyPy enought to start to participate. We will hold a PyPy tutorial and an architectural overview. Planning meeting for the work to be done during the week and grouping of developers (pairs or groups mixing new participants with core developers). Dinner in the evening (Yutaka will arrange a place for us to go to). Monday-Tuesday: Starting at 10:00 with status meetings. Possible regrouping depending on the interest and progress of the various teams. Wednesday: Breakday (coding is allowed although we recommend taking a break). Thursday-Saturday: Starting at 10:00 with status meetings. Possible regrouping depending on the interest and progress of the various teams. Ending on Saturday with a Closure session - summing of the work and planning work to be done until the next sprint. Network, Food, currency We will have access to WiFi at AIST - please make sure you have wlan
Re: determine file type
On Sun, 26 Mar 2006 19:52:32 -0700, Mark Gibson wrote: import os def test_file(filename, maxread=1024): if os.path.isdir(filename): return 'directory' afile = open(filename) # open as text for achar in afile.read(maxread): if ord(achar) 127: return 'binary' return 'text' Pefect, thanks! Not only is it not perfect, as given it isn't even correct. open(lots_of_nulls.bin, w).write(\0 * 1024) test_file(lots_of_nulls.bin) 'text' However, with a more careful algorithm for deciding what's text and what's not, the general approach is fine. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: XMLRPCServer issues
looping wrote: 2. You might want to transmit integers as strings rather than use the XML-RPC integer type (which is limited to numbers between -2147483648 and 2147483647). Is it a limit of XML-RPC RFC or a limit (probably with a good reason) of the python xmlrpclib ? the specification defines an integer field as a four-byte signed integer. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: COM Client / Server creation?
Thanks, I am going to try to implement with Python. -- http://mail.python.org/mailman/listinfo/python-list
Re: adding a new line of text in Tk
Ben Cartwright wrote: w =Label(root, text=Congratulations you have made it this far,just a few more questions then i will be asking you some) The problem i have is where i have started to write some textCongratulations you have made it this far,just a few more questions then i will be asking you some) I would actually like to add some text but it puts it all on one line.I would like to be able to tell it to start a new line. Just use \n in your string, e.g.: w = Label(root, text=Line 1\nLine 2\nLine 3) Or a triple-quoted string will do the trick: w = Label(root, text=Line 1 Line 2 Line 3) you can also use the wraplength option to set a max width for the label widget: w = Label( root, text=long paragraph..., wraplength=150, justify=LEFT ) also see: http://effbot.org/tkinterbook/label.htm /F -- http://mail.python.org/mailman/listinfo/python-list
Re: XMLRPCServer issues
Fredrik Lundh wrote: looping wrote: 2. You might want to transmit integers as strings rather than use the XML-RPC integer type (which is limited to numbers between -2147483648 and 2147483647). Is it a limit of XML-RPC RFC or a limit (probably with a good reason) of the python xmlrpclib ? the specification defines an integer field as a four-byte signed integer. /F OK, I will remove my MAXINT hack and convert value to string. Thanks everybody for your fast answers, nice group with nice (and brillant) people. See you later for my next question. -- http://mail.python.org/mailman/listinfo/python-list
Re: access mbx files?
Donn Cave, [EMAIL PROTECTED] I suppose it isn't supported by the mailbox module basically because it isn't all that commonly encountered. It may be more common on mail servers, but there it's email net protocol data, POP or IMAP. If Mahogany has been using this format for `local' folders (i.e., via filesystem), I think that may have been kind of poor judgement on the part of its developers. I cannot judge that, although I think I recall the choice was made for reasons of speed. What do you see as the downsides? Just that it is uncommon (and thus questions like my original questions arise)? Thanks, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list
DELETE an image
hi guys, could u tell me how to delete images ( files) from a folder by using dtml tags in zope? Because I upload images there and test whether it is meet size requirment and then upload it to the folder it supposed to be. Pls help me, thanks. Cheng -- http://mail.python.org/mailman/listinfo/python-list
tkinter+matplotlib
i have coded some progs that use the Pmw.Blt.Graph widgets, embedded in a simple Tkinter GUI , | from Tkinter import * | import Pmw | ... | frame=Frame(root) | ... | graph=Pmw.Blt.Graph(frame,...) | graph.line_create(...) | graph.pack(...) ` now i'd like to port those progs to an environment where i have no BLT assuming that i can use matplotlib to draw the line graphs i need, how do i place the graph widget inside my tkinter GUI? tia, gb -- If you grow tired of the friends you make Never ever turn the back on them Say they were the best of time you ever had The best of times with the thougthless kind-- John Cale -- http://mail.python.org/mailman/listinfo/python-list
Re: Python, equivalent of set command
loial wrote: In unix shell script I can do the following to get the status and values returned by a unix command OUTPUT=`some unix command` STATUS=$? if [ $STATUS -ne 0 ] then exit 1 else set $OUTPUT VAL1=$1 VAL2=$2 VAL3=$3 fi How can I achieve the same in python? I know how to run it via the os.system command and return the status, but how do I return the values too? http://docs.python.org/lib/node241.html 6.8.3.1 Replacing /bin/sh shell backquote output=`mycmd myarg` == output = Popen([mycmd, myarg], stdout=PIPE).communicate()[0] The popen object also has a 'returncode' attribute. -- http://mail.python.org/mailman/listinfo/python-list
COM server / COM client
Does the COM server created with python have to be compiled? I have the need to integrate database access but, I can not have any proprietary software. Meaning no compiled programs built by me. So, if python can do com clients and servers without compiling, Im good. But I don't know if that is possible. The ctypes example implies that it must be compiled using py2exe. I know the clients don't have to be compiled. What about the server? -- http://mail.python.org/mailman/listinfo/python-list
Re: a problem to solve
[EMAIL PROTECTED] wrote: And furthermore, having Python's bitwise operators is nice, but it's not nice enough. I need the bitwise functionality gmpy provides that's not available in Python: scan for position of least significant 1 or 0, Cute tricks (artifact of two's complement notation): v -v == isolated least significant bit of v math.log(v -v, 2) == bit number of least significant bit. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: access mbx files?
Quoth David Isaac [EMAIL PROTECTED]: | Donn Cave, [EMAIL PROTECTED] | I suppose it isn't supported by the mailbox module basically because | it isn't all that commonly encountered. It may be more common on mail | servers, but there it's email net protocol data, POP or IMAP. If | Mahogany has been using this format for `local' folders (i.e., via | filesystem), I think that may have been kind of poor judgement on the | part of its developers. | | I cannot judge that, although I think I recall the choice was made | for reasons of speed. What do you see as the downsides? | Just that it is uncommon (and thus questions like my original | questions arise)? That's one problem, it's inaccessible to a wide variety of email software you might want to run. Maybe worse, it's fragile. It has, for no particular reason, a header full of NUL bytes, which some editors will through away. Any change to contents without the corresponding change to the header destroys the folder past that point. Etc. And for all that, it doesn't buy you much. Donn Cave, [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: maximum() efficency
Just for completeness: The functions in Steve's original post named maximum calculate the minimum. Also, timing-wise, on my machine with a random list of 20 integers Steve's iteration version and Mitja's version are about equal, the system built-in is equal or slightly slower, and Paul's version about 3-4x slower. If the comparison function is very complex, the mileage may vary of course. -- http://mail.python.org/mailman/listinfo/python-list
Re: COM server / COM client
Dan wrote: Does the COM server created with python have to be compiled? I have the need to integrate database access but, I can not have any proprietary software. Meaning no compiled programs built by me. So, if python can do com clients and servers without compiling, Im good. But I don't know if that is possible. The ctypes example implies that it must be compiled using py2exe. I know the clients don't have to be compiled. What about the server? Sounds like you are walking a fine line on the no compiled programs written by me thing. Py2exe doesn't REALLY compile python. Rather it PACKAGEs it into an .exe file with any required external routines in library.zip. With proper bundle option, you can put everything into the .exe file itself (except for mscvrt71.dll). Just makes it easier to distribute and you don't have to install Python. Using py2exe and Inno Setup (my recommendation) makes it easier to distribute your program to multiple computers. That said, no you don't have to compile. If you don't create .exe by using py2exe you must have Python on the machine and must set up any supporting libraries (like ctypes) in lib/site-packages. -Larry Bates -- http://mail.python.org/mailman/listinfo/python-list
encode short string as filename (unix/windows)
want to encode/decode an arbitrary short 8-bit string as save filename. is there a good already builtin encoding to do this (without too much inflation) ? or re.sub expression? or which characters are not allowed in filenames on typical OS? robert -- http://mail.python.org/mailman/listinfo/python-list
Re: Accessing func_name from inside a function
Eyal Lotem wrote: By the way, the real problem here is referencing by name, rather than using true references. Which is the result of using a textual language. The real solution would be to store real-references to the function and only present the name in a graphical interface. There is a problem with this attitude (to which I used to subscribe). Just as what constitutes a mathematical proof is a social agreement among mathematicians, programmers need to be able to read programs by other programmers. People do not communicate in data structures. I worked with LML, a lazy ML variant that (among other things) allowed specification of the print form of structures. I wound up debugging (for a nasty 12 hours) a program which printed identically to the correct program, but was not, in fact, the correct program. That one experience has convinced me that programs are defined in print, not structures. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
On 2006-03-27, robert [EMAIL PROTECTED] wrote: want to encode/decode an arbitrary short 8-bit string as save filename. is there a good already builtin encoding to do this (without too much inflation) ? or re.sub expression? or which characters are not allowed in filenames on typical OS? Under unix, / and NULL aer not allowed. There are other characters that are not recommended, but those are the only two that are not allowed. -- Grant Edwards grante Yow! .. the MYSTERIANS are at in here with my CORDUROY visi.comSOAP DISH!! -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
want to encode/decode an arbitrary short 8-bit string as save filename. is there a good already builtin encoding to do this (without too much inflation) ? or re.sub expression? or which characters are not allowed in filenames on typical OS? On Windows, / \ : * ? | are forbidden, and the name can't be empty. Using urlsafe_b64encode/...decode should work on any platform. -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
robert wrote: want to encode/decode an arbitrary short 8-bit string as save filename. is there a good already builtin encoding to do this (without too much inflation) ? or re.sub expression? Yuu could use the base64-encoder. Disadvantage is clearly that you can't easily read your original text. Alternatively, three is that encoding that is used by e.g. emails if you have an umlaut in a name. I _think_ it is called puny-code, but I'm not sure how and if you can use that from within python - google yourself :) diez -- http://mail.python.org/mailman/listinfo/python-list
Re: maximum() efficency
Arne Ludwig [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Just for completeness: The functions in Steve's original post named maximum calculate the minimum. Also, timing-wise, on my machine with a random list of 20 integers Steve's iteration version and Mitja's version are about equal, the system built-in is equal or slightly slower, and Paul's version about 3-4x slower. If the comparison function is very complex, the mileage may vary of course. Arne - The version I posted (which is not mine by the way, but I've lost the original citation) becomes much more competitive when run with psyco. With your list of 200,000 integers, I believe it will outpace even the C library built-ins. -- Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
On Mon, 27 Mar 2006 18:13:17 +0200, Diez B. Roggisch [EMAIL PROTECTED]
wrote:
robert wrote:
want to encode/decode an arbitrary short 8-bit string as save filename.
is there a good already builtin encoding to do this (without too much
inflation) ? or re.sub expression?
Yuu could use the base64-encoder. Disadvantage is clearly that you can't
easily read your original text. Alternatively, three is that encoding that
is used by e.g. emails if you have an umlaut in a name. I _think_ it is
called puny-code, but I'm not sure how and if you can use that from within
python - google yourself :)
punycode is used by dns. A commonly used email codec is quoted-printable.
Here's an example of each:
u'Helló world'.encode('utf-8').encode('quopri')
'Hell=C3=B3=20world'
u'Helló world'.encode('punycode')
'Hell world-jbb'
Note the extra trip through utf-8 for quoted-printable, as it is not
implemented in Python as a character encoding, but a byte encoding, so you
cannot (safely) apply it to a unicode string.
Jean-Paul
--
http://mail.python.org/mailman/listinfo/python-list
Re: COM object pointer cast
On 27 Mar 2006 00:19:09 -0800, Axel Bock [EMAIL PROTECTED] wrote: I am fooling around with the Python-COM bridge, and I have a little question with that. In the component I am using is a method which will return an Entry object - basically. In truth it returns some object which inherits from entry, and I know which one, but - as said - the method will only return the IEntry interface pointer. Now I would like to cast that one to the one I need :) . Is there an easy way to do it, or do I have to use the QueryInterface-method to get what I want? There's an easy way - use win32com.client.CastTo(). See the convert_tracks.py script on this page - http://www.brunningonline.net/simon/blog/archives/001742.html for an example. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: object references
On Sat, 25 Mar 2006 21:33:24 -0800, DrConti wrote:
Dear Python developer community,
I'm quite new to Python, so perhaps my question is well known and the
answer too.
I need a variable alias ( what in other languages you would call a
pointer (c) or a reference (perl))
Others have given you reasons why you can't do this, or shouldn't do this.
In general, I agree with them -- change your algorithm so you don't
need indirect references.
But if you can't get away from it, here is another work-around that might
help:
class ObjectClass:
Test primary Key assignment
if __name__ == __main__:
ObjectClassInstantiated=ObjectClass()
ObjectClassInstantiated.AnAttribute='First PK Elem'
ObjectClassInstantiated.AnotherOne='Second PK Elem'
ObjectClassInstantiated.Identifier=[]
ObjectClassInstantiated.Identifier.append(ObjectClassInstantiated.AnAttribute)
ObjectClassInstantiated.Identifier.append(ObjectClassInstantiated.AnotherOne)
print ObjectClassInstantiated.Identifier
ObjectClassInstantiated.AnAttribute='First PK Elem Changed'
print ObjectClassInstantiated.Identifier
# helper class
class Indirect:
def __init__(self, value):
self.value = value
def mutate(self, newvalue):
self.value = newvalue
def __eq__(self, other):
return self.value == other
def __repr__(self):
return - %r % self.value
instance = ObjectClass()
instance.attribute = Indirect('First PK Elem')
instance.another_attribute = Indirect('Second PK Elem')
instance.identifier = [instance.attribute, instance.another_attribute]
print instance.identifier
instance.attribute.mutate('First PK Elem Changed')
print instance.identifier
which prints
[- 'First PK Elem', - 'Second PK Elem']
[- 'First PK Elem Changed', - 'Second PK Elem']
as requested.
--
Steven.
--
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Re: COM server / COM client
Sounds like you are walking a fine line on the no compiled programs written by me thing. Yeah, I hate it. I could have written a C++ server, client application etc.. very easily. Instead, I have had to write javascript on the client to embed in an html page to view, insert,delete etc.. SQL server table over the intranet via ADO. But, requirements are requirements. Besides, I am learning a lot and thats always good. We are integrators, so our clients specifications are always vague and with an eye toward leaving themselves outs whenever possible. That said, no you don't have to compile. If you don't create .exe by using py2exe you must have Python on the machine and must set up any supporting libraries (like ctypes) in lib/site-packages. That won't be a problem since all of the clients will be our own pc's so we will be installing python on each. What about activeX controls? Will I be able to create an activeX client control using python for embedding into a web document, again without compiling ? I know I could use Javascript to gain access to the python server but I don't know if it will allow me to subscribe to the events properly. In the ADO interfaces at least you can not receive the events fired from the server via Javascript or VBScript. Thanks, Dan -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
On Mon, 27 Mar 2006 08:14:07 -0800, nikie wrote: want to encode/decode an arbitrary short 8-bit string as save filename. is there a good already builtin encoding to do this (without too much inflation) ? or re.sub expression? or which characters are not allowed in filenames on typical OS? On Windows, / \ : * ? | are forbidden, and the name can't be empty. Windows also has a number of reserved names that you can't use. However, in general, it is best to ignore that and just let Windows raise an error if it chooses. But for completeness, here is the the canonical list of prohibited file names and characters for Windows: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/naming_a_file.asp or http://makeashorterlink.com/?I2B853DDC -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
Jean-Paul Calderone wrote:
punycode is used by dns. A commonly used email codec is
quoted-printable. Here's an example of each:
u'Helló world'.encode('utf-8').encode('quopri')
'Hell=C3=B3=20world'
u'Helló world'.encode('punycode')
'Hell world-jbb'
Note the extra trip through utf-8 for quoted-printable, as it is not
implemented in Python as a character encoding, but a byte encoding, so
you cannot (safely) apply it to a unicode string.
Jean-Paul
u'Helló world\\/\x00'.encode('punycode')
'Hell world\\/\x00-elb'
u'Helló world\\/\x00'.encode('utf-8').encode('quopri')
'Hell=C3=B3=20world\\/=00'
that doesn't remove \ /
that other base.. things similar
so finally found me reggae'ing :-( , but this provides minimal optical
damage for common strings ...
def encode_as_filename(s):
def _(m): return +%02X % ord(m.group(0))
return re.sub('[\x00/*?:|+\n]',_,s)
def decode_from_filename(s):
def _(m): return chr(int(m.group(0)[1:],16))
return re.sub(\\+[\dA-F]{2,2},_,s)
newsletter.encode_as_filename('[EMAIL PROTECTED]/\\+\n\x00:+test')
'[EMAIL PROTECTED]'
newsletter.decode_from_filename(_)
'[EMAIL PROTECTED]/\\+\n\x00:+test'
Robert
--
http://mail.python.org/mailman/listinfo/python-list
using a perl mod
almost 41 million hits from google about using perl mod's in python was a bit discouraging...So, I thought about asking humans. There are some perl modules written to manage files, acls, etc in afs. Rather than wrapping the c-compiled versions of afs commands in sys.popen and parsing the output, I was hoping to use the perl mods and the perl objects returned by these mods in python -- since I can't stand reading perl. The question then becomes, are there any python modules that encapsulate and map perl objects into python object? -- David Bear -- let me buy your intellectual property, I want to own your thoughts -- -- http://mail.python.org/mailman/listinfo/python-list
Re: encode short string as filename (unix/windows)
Steven D'Aprano wrote: On Mon, 27 Mar 2006 08:14:07 -0800, nikie wrote: want to encode/decode an arbitrary short 8-bit string as save filename. is there a good already builtin encoding to do this (without too much inflation) ? or re.sub expression? or which characters are not allowed in filenames on typical OS? On Windows, / \ : * ? | are forbidden, and the name can't be empty. Windows also has a number of reserved names that you can't use. However, in general, it is best to ignore that and just let Windows raise an error if it chooses. But for completeness, here is the the canonical list of prohibited file names and characters for Windows: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/naming_a_file.asp or http://makeashorterlink.com/?I2B853DDC thanks. infact to avoid COMx etc. I have also to prepend and remove a char like _ on encode/decode in addition to what I just posted Robert -- http://mail.python.org/mailman/listinfo/python-list
front end GUI
I'm looking for software to create a simple GUI to execute python code for users in the office. The GUI would need a couple text boxes for user input and some option buttons and check boxes. Can anyone recommend free software that doesn't require a huge learning curve? My python skills are probably a 3 or 4 on a scale from 1 to 10. Thanks for your help! R.D. -- http://mail.python.org/mailman/listinfo/python-list
Where does Python look for libraries?
I have been trying to get the gdmodule installed and have run into an issue. When I import gd I get the following error. import gd Traceback (most recent call last): File stdin, line 1, in ? File /usr/local/lib/python2.3/site-packages/gd.py, line 10, in ? import _gd ImportError: /usr/local/lib/libgd.so.2: Undefined symbol libiconv_open But, when I run nm libiconv.so in the directory with the iconv library I get an entry like this 00011fe0 T libiconv_open so I know the functionality is there. So, my question. Does python have a way to add search directories for locating libraries? Thanks. -- http://mail.python.org/mailman/listinfo/python-list
CGI redirection: let us discuss it further
I am now programming python scripts for CGI environment. The redirection has been discussed in this forum for over one hundred times. I have seen most of them, but still have some questions: 1. Are there any method (in python of course) to redirect to a web page without causing a Back button trap(ie, when user click the back button on their web browser, they are redirect to their current page, while their hope is probably to go back to the last page they have seen, rather than the redirection page with a Location: url head and blank content.)? 2. Are there any method to use relative path, rather than full absolute URI path in Location: url? It is very essential for later transplant work, e.g.,transplant a folder of cgi scripts from one web server to another, with different URL. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
Clemens Hepper wrote: It's strange: python seem to cache constants from 0 to 99: That's true. The Python api doc says that Python keeps an array of integer objects for all integers between -1 and 100. See http://docs.python.org/api/intObjects.html. This also seems to be true for integers from -5 to -2 on (ActiveState) Python 2.4.2. -- fw -- http://mail.python.org/mailman/listinfo/python-list
Re: using a perl mod
Don't know if there is a way to call perl from Python but the perl inline python module allows you to call perl from python from within an outer perl interpreter. Thts what I make of the following anyway: http://aspn.activestate.com/ASPN/CodeDoc/Inline-Python/Python.html - Paddy. -- http://mail.python.org/mailman/listinfo/python-list
Re: using a perl mod
There is also:PyPerl at: http://search.cpan.org/dist/pyperl/perlmodule.pod But you need to check if it is current. - Pad. -- http://mail.python.org/mailman/listinfo/python-list
Re: Difference between 'is' and '=='
In article [EMAIL PROTECTED], Diez B. Roggisch [EMAIL PROTECTED] wrote: ... So - your conclusion is basically right: use is on (complex) objects, not on numbers and strings and other built-ins. The exception from the rule is None - that should only exist once, so foo is not None is considered better style than foo == None. But even better style is just `foo' or `not foo'. Or not, depending on what you're thinking. The key point between `is' and `==' has already been made - - use `is' to compare identity - use `==' to compare value It's that simple, and it's hard to add to this without potentially layering some confusion on it. While Python's implementation makes the use of identity with small numbers a slightly more complicated issue, there isn't a lot of practical difference. To take a common case that has already been mentioned here, if I define some constant symbolic values as small integers, as long as I take care that their values are distinct, I can reasonably use identity and ignore this technical weakness. I can assume that no one is going to supply randomly selected integers in this context. Meanwhile, the use of identity clarifies the intent. Depending, of course, on what the intent may be, which brings us to None, and a point about values in Python that was brought to a fairly brilliant light some years back by someone we don't hear from often here any more, unfortunately. - use `is' to compare identity - use `==' to compare value - use neither to test for `somethingness' I'm not going to try to elucidate the theory of something and nothing in Python, but suffice it to say that there are places where it may be better to write if not expr: than if expr is None: or worse yet, if expr == False: That's what I think, anyway. Donn Cave, [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: front end GUI
DataSmash schrieb: I'm looking for software to create a simple GUI to execute python code for users in the office. The GUI would need a couple text boxes for user input and some option buttons and check boxes. Can anyone recommend free software that doesn't require a huge learning curve? My python skills are probably a 3 or 4 on a scale from 1 to 10. Use the shipped tkinter. Diez -- http://mail.python.org/mailman/listinfo/python-list
pysqlite
anyone have v2.x of pysqlite that I could download? the website is down for a hardware upgrade with no date as to when it will be back. I checked sourceforge but there are no files there to download. thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: CGI redirection: let us discuss it further
Sullivan WxPyQtKinter enlightened us with: 1. Are there any method (in python of course) to redirect to a web page without causing a Back button trap(ie, when user click the back button on their web browser, they are redirect to their current page, while their hope is probably to go back to the last page they have seen, rather than the redirection page with a Location: url head and blank content.)? I don't know if this is possible using CGI. I use CherryPy, and it has an InternalRedirect method. Same is true for mod_python and Apache. Sybren -- The problem with the world is stupidity. Not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself? Frank Zappa -- http://mail.python.org/mailman/listinfo/python-list
Re: Programming challenge: wildcard exclusion in cartesian products
Going in a slightly different direction ... There has been lots of published work on how to create efficient FSMs from regexps. Generally these FSMs are used for pattern matching (i.e. does string 's' match regexp 'e'?). Is there any corresponding literature on the topic addressed by the OP's challenge of generating the languaged defined by a regexp (or the complement of that regexp)? --jfc -- http://mail.python.org/mailman/listinfo/python-list
Re: pysqlite
Dennis Lee Bieber wrote: On 27 Mar 2006 10:17:21 -0800, abcd [EMAIL PROTECTED] declaimed the following in comp.lang.python: anyone have v2.x of pysqlite that I could download? the website is down for a hardware upgrade with no date as to when it will be back. Source or binary (or everything)? Architecture? I need v 2.x for windows, running python v2.4 u can email it to me, codecraig _A_T_ gmail _D_O_T_ com thx -- http://mail.python.org/mailman/listinfo/python-list
problems with looping, i suppose
Here's an exercise I was doing to guess a number from 1-100. Just for fun (ha ha) I decided to add some error checking too, and now when I run it, the DOS prompt flashes real quick and disappears. At first, I had just the top try/except block and not the second one, and that worked (as far as it would work), but after adding the second try/except, it has this problem. I'm sure it has something to do with the looping and the breaks/continues. I'd appreciate any help on this, and also any suggestions for programs that let you step through code to debug it (I'm used to Visual Studio). I have SPE installed at home, but not here at work so I can't try it right now. I assume it has a debugger. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: problems with looping, i suppose
John Salerno wrote:
Here's an exercise I was doing
This might help:
import random
number = random.choice(range(1, 100))
tries = 0
while True:
try:
guess = input('Enter a number between 1 and 100: ')
break
except NameError:
print 'Invalid number\n'
continue
while True:
tries += 1
try:
if guess == number:
print 'Congratulations! You got it in', tries, 'guess(es).'
break
elif guess number:
guess = input('Too low. Try again: ')
elif guess number:
guess = input('Too high. Try again: ')
except NameError:
print 'Invalid number\n'
continue
raw_input()
--
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Re: object references
Steven D'Aprano wrote:
On Sat, 25 Mar 2006 21:33:24 -0800, DrConti wrote:
Dear Python developer community,
I'm quite new to Python, so perhaps my question is well known and the
answer too.
I need a variable alias ( what in other languages you would call a
pointer (c) or a reference (perl))
Others have given you reasons why you can't do this, or shouldn't do this.
In general, I agree with them -- change your algorithm so you don't
need indirect references.
But if you can't get away from it, here is another work-around that might
help:
(snip)
And another one, that mess less with attributes (but more with lookup
rules - use it at your own risks !-):
class CompoundAttribute(object):
def __init__(self, *names):
self._names = names
def __get__(self, obj, objtype):
if obj is None:
return self
return [getattr(obj, name) for name in self._names]
def __set__(self, obj, value):
raise TypeError, object '%s' does not support assignement % self
import types
class ObjectClass(object):
def __getattribute__(self, name):
v = object.__getattribute__(self, name)
if not isinstance(v, types.FunctionType) \
and hasattr(v, '__get__'):
return v.__get__(self, self.__class__)
return v
instance = ObjectClass()
instance.attribute = 'First PK Elem'
instance.another_attribute = 'Second PK Elem'
instance.identifier = CompoundAttribute('attribute', 'another_attribute')
NB : Sorry, not tested.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
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Re: problems with looping, i suppose
John Salerno wrote:
Here's an exercise I was doing to guess a number from 1-100.
Here's another question that is related:
while True:
year = raw_input('Enter year (or other character to quit): ')
try:
year = int(year)
except NameError:
break
if (year % 4 == 0) and (year % 100 != 0 or year % 400 == 0):
print year, 'is a leap year.\n'
else:
print year, 'is not a leap year.\n'
raw_input()
This works as expected, except that if you enter any character other
than a number, the program just quits. Why doesn't it still execute the
raw_input function and pause? I think this is what is happening in the
other exercise too, but I don't know why. If you break out of the loop,
should it still pause at raw_input?
--
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Re: problems with looping, i suppose
Just barely looked the code answer: check you scope on the second try block. if that doesn't work... I'll read it for real :) Try PyDev plugin with eclipse - it's served me fairly well, but I did come from Java - so I'm an eclipse fan already. -- http://mail.python.org/mailman/listinfo/python-list
Re: object references
DrConti wrote:
I need a variable alias ( what in other languages you would call a
pointer (c) or a reference (perl))
Or, you think you need it.
I read some older mail articles and I found that the offcial position
about that was that variable referencing wasn't implemented because
it's considered bad style.
Generally, yes. The line goes, roughly, You've decided on a solution
and are twisting your problem to fit it.
There was also a suggestion to write a real problem where referencing
is really needed. I have one...:
I'm trying to generate dynamically class methods which works on
predefined sets of object attributes.
one of these is the set of attributes identfying uniquely the object
(primary key).
First, this is _not_ a real problem; this is a bunch of code. The
real problem request is to provide an actual use case, not some code
where you want to write what you want to write.
A naïve attempt to do the job:
class ObjectClass:
Test primary Key assignment
if __name__ == __main__:
ObjectClassInstantiated=ObjectClass()
ObjectClassInstantiated.AnAttribute='First PK Elem'
ObjectClassInstantiated.AnotherOne='Second PK Elem'
ObjectClassInstantiated.Identifier=[]
ObjectClassInstantiated.Identifier.append(ObjectClassInstantiated.AnAttribute)
ObjectClassInstantiated.Identifier.append(ObjectClassInstantiated.AnotherOne)
print ObjectClassInstantiated.Identifier
ObjectClassInstantiated.AnAttribute='First PK Elem Changed'
print ObjectClassInstantiated.Identifier
If you insist on this kind of approach, you could use a pair of
an object, and an attribute name as a reference, and use getattr
and setattr to access the identified attribute. _But__ I emphasize
that you are thinking about your problem from the point of view
of a solution, not from the point of view of the problem.
You'd probably like this:
class Example(object):
Test primary Key assignment
def __init__(self, one, two, other):
self.one = one
self.two = two
self.other = other
def __repr__(self):
return '%s(%r, %r, %r)' % (
type(self).__name__, self.one, self.two, self.other)
if __name__ == __main__:
eg = Example(3.1415, 3+4j, 'pi')
ref_attr = eg, 'one'
ref_other = eg, 'other'
print eg, getattr(*ref_attr), getattr(*ref_other)
eg.one = 'First PK Elem'
print eg, getattr(*ref_attr), getattr(*ref_other)
setattr(*ref_other + (u'Strangely',))
print eg, getattr(*ref_attr), getattr(*ref_other)
But you might consider this:
class Another(Example):
Test primary Key assignment
key = ('one', 'two')
def getkey(v):
return [getattr(v, part) for part in v.key]
if __name__ == __main__:
eg2 = Another(3.1415, 3+4j, 'pi')
print eg2, getkey(eg2)
eg2.one = 'First PK Elem'
print eg2, getkey(eg2)
setattr(eg2, 'two', u'Strangely')
print eg2, getkey(eg2)
--
-Scott David Daniels
[EMAIL PROTECTED]
--
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