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Re: Given a string - execute a function by the same name

2008-04-29 Thread Bruno Desthuilliers


[EMAIL PROTECTED] a écrit :

I'm parsing a simple file and given a line's keyword, would like to call
the equivalently named function.

There are 3 ways I can think to do this (other than a long if/elif
construct):

1. eval() 


2. Convert my functions to methods and use getattr( myClass, method )

3. Place all my functions in dictionary and lookup the function to be
called



4. Place all your functions in a module and use getattr(the_module, func)

5. use globals().get(func)

 Any suggestions on the best way to do this?

#1 is the worst possible solution, and #2 doesn't make sens if you don't 
need methods.


#4 is simple but can be problematic since these functions are not 
necessarily related enough to make for a module with hi cohesion and low 
coupling.


#5 is the simplest solution, but can be dangerous, since just any 
function in the global namespace (which includes the builtins...) can be 
called.


#3 is a bit heaviest to setup and maintain, but much more secure since 
you explicitely choose the availables functions.


Depending on the context (ie: where this 'simple file' comes from), I'd 
choose #3 or #5.


My 2 cents...
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SWIG Python undefined reference

2008-04-29 Thread Soren

Hi,

I went through the SWIG tutorial for the example named simple.

I managed to get to the first step, creating example_wrap.c using
swig, and doing:
gcc -fpic -c example_wrap.c -IC:\python24\include  to create
example_wrap.o

But when I needed to compile the library file using:
gcc -shared example_wrap.o -o examplemodule.so I received a lot of
undefined reference compiler errors like:

example_wrap.o(.text+0x35a5):example_wrap.c: undefined reference to
`_imp__PyErr
_SetString'

there are many other similar errors all prefaced with _imp__Py, so I
am assuming there is a linker error with the python libraries. I have
adjusted my PATH variable to include all the python directories (libs/
dlls).

Does anyone here have any suggestions?

FILES FROM TUTORIAL:


//example.c
#include time.h
double My_variable = 3.0;

int fact(int n) {
if (n = 1) return 1;
else return n*fact(n-1);
}

int my_mod(int x, int y) {
return (x%y);
}

char *get_time()
{
time_t ltime;
time(ltime);
return ctime(ltime);
}
//***

//example.i
%module example
%{
/* Put header files here or function declarations like below */
extern double My_variable;
extern int fact(int n);
extern int my_mod(int x, int y);
extern char *get_time();
%}

extern double My_variable;
extern int fact(int n);
extern int my_mod(int x, int y);
extern char *get_time();
//***

//setup.py
from distutils.core import setup, Extension

setup(name='example',
version = '1.0',
ext_modules=[
Extension('example', ['example.c', 'example.i'])
])
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Re: How to unget a line when reading from a file/stream iterator/generator?

2008-04-29 Thread Duncan Booth

George Sakkis [EMAIL PROTECTED] wrote:

 On Apr 28, 10:10 pm, [EMAIL PROTECTED] wrote:
 George,

  Is there an elegant way to unget a line when reading from a
  file/stream 
 iterator/generator?

 http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/502304

 That's exactly what I was looking for!

 For those following this thread, the above recipe creates a generic
 object that wraps any iterator with an 'unget' (push) capability.
 Clean and elegant!

 Thank you,
 Malcolm
 
 A small suggestion: since unget is expected to be called infrequently,
 next should better be faster for the common case instead of penalizing
 it with a try/except:
 
 def next(self):
 if not self.pushed_back:
 return self.it.next()
 else:
 return self.pushed_back.pop()
 

If speed is an issue then it may be better to avoid the test altogether:

def __init__(self, it):
self.it = it
self.pushed_back = []
self.nextfn = it.next

def __iter__(self):
return self

def __nonzero__(self):
if self.pushed_back:
return True

try:
self.pushback(self.nextfn())
except StopIteration:
return False
else:
return True

def popfn(self):
lst = self.pushed_back
res = lst.pop()
if not lst:
self.nextfn = self.it.next
return res

def next(self):
return self.nextfn()

def pushback(self, item):
self.pushed_back.append(item)
self.nextfn = self.popfn
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Re: So you think PythonCard is old? Here's new wine in an old bottle.

2008-04-29 Thread Panyasan

Hi,

I am one of the two developers working on the xml-to-javascript
converter (qxtransformer) John has mentioned and we are thrilled that
our project has found a use in the PythonCard community.

However, we have a problem getting PythonCard to work on our Macs (Mac
OS 10.5 Leopard). We should probably be asking this on the PythonCard
help list, but since the list seems to be somewhat deserted (very few
posts) and John is active here and people seem to be using PythonCard,
maybe someone has an idea. It might be very simple and stupid - I have
never worked with python before.

I am using
- PythonCard 0.8.2 release on Leopard, which is copied by setup.py to /
Library/Python/2.5/site-packages
- John's layoutEditor package, (http://qxtransformer.googlegroups.com/
web/layoutEditor.zip)

PythonCard email list says that Leopard and PythonCard 0.8.2 seem to
like each other generally:

http://sourceforge.net/mailarchive/forum.php?thread_name=EE5213D5-A005-4ED0-9512-111B6D4F06A7%40bu.eduforum_name=pythoncard-users

and I can get the examples working. However, when I start John's
modified layoutEditor.py, I get an empty window and the following
error is thrown:

no resource file for /Users/bibliograph/Programme/PythonCard/tools/
layoutEditor/multipropertyEditor
Traceback (most recent call last):
  File /BinaryCache/wxWidgets/wxWidgets-11~57/Root/System/Library/
Frameworks/Python.framework/Versions/2.5/Extras/lib/python/wx-2.8-mac-
unicode/wx/_core.py, line 14095, in lambda
  File /Library/Python/2.5/site-packages/PythonCard/tools/
layoutEditor/layoutEditor.py, line 153, in on_initialize
self.propertyEditorWindow = model.childWindow(self,
PropertyEditor)
  File /Library/Python/2.5/site-packages/PythonCard/model.py, line
213, in childWindow
rsrc = resource.ResourceFile(filename).getResource()
  File /Library/Python/2.5/site-packages/PythonCard/resource.py,
line 45, in __init__
self.dictionary = util.readAndEvalFile(rsrcFileName)
  File /Library/Python/2.5/site-packages/PythonCard/util.py, line
39, in readAndEvalFile
f = open(filename)
TypeError: coercing to Unicode: need string or buffer, NoneType found

there is a file PythonCard/tools/layoutEditor/modules/
multipropertyEditor.rsrc.py

When I resize the window, I get the following errors

Tue Apr 29 10:48:08 noname Python[40440] Error: CGContextConcatCTM:
invalid context
Tue Apr 29 10:48:08 noname Python[40440] Error: CGContextSaveGState:
invalid context
Tue Apr 29 10:48:08 noname Python[40440] Error: doClip: invalid
context
Tue Apr 29 10:48:08 noname Python[40440] Error: CGContextSaveGState:
invalid context
Tue Apr 29 10:48:08 noname Python[40440] Error:
CGContextSetBlendMode: invalid context
Tue Apr 29 10:48:08 noname Python[40440] Error:
CGContextSetShouldAntialias: invalid context
Traceback (most recent call last):
  File /Library/Python/2.5/site-packages/PythonCard/model.py, line
884, in _dispatch
handler(background, aWxEvent)
  File /Library/Python/2.5/site-packages/PythonCard/tools/
layoutEditor/layoutEditor.py, line 560, in on_size
self.createDC()
  File /Library/Python/2.5/site-packages/PythonCard/tools/
layoutEditor/layoutEditor.py, line 556, in createDC
dc.SetLogicalFunction(wx.INVERT)
  File /BinaryCache/wxWidgets/wxWidgets-11~57/Root/System/Library/
Frameworks/Python.framework/Versions/2.5/Extras/lib/python/wx-2.8-mac-
unicode/wx/_gdi.py, line 4079, in SetLogicalFunction
wx._core.PyAssertionError: C++ assertion status == noErr failed
at ../src/mac/carbon/graphics.cpp(1324) in EnsureIsValid(): Cannot
nest wxDCs on the same window

Thanks for any pointers,

Christian
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Re: Question regarding Queue object

2008-04-29 Thread Nick Craig-Wood

Terry [EMAIL PROTECTED] wrote:
  On Apr 28, 5:30 pm, Nick Craig-Wood [EMAIL PROTECTED] wrote:
  David [EMAIL PROTECTED] wrote:
Another idea would be to have multiple queues, one per thread or per
message type group. The producer thread pushes into the appropriate
queues (through an intelligent PutMsg function), and the consumer
threads pull from the queues they're interested in and ignore the
others.
 
  Unfortunately a thread can only wait on one Queue at once (without
  polling).  So really the only efficient solution is one Queue per
  thread.
 
  Make an intelligent PutMsg function which knows which Queue (or
  Queues) each message needs to be put in and all the threads will have
  to do is Queue.get() and be sure they've got a message they can deal
  with.
 
  I do have one Queue per thread. The problem is the thread can not peek
  into the Queue and select msg with certain ID first.

My point is don't put messages that the thread doesn't need in the
queue in the first place.  Ie move that logic into PutMsg.

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Re: Receive data from socket stream

2008-04-29 Thread Nick Craig-Wood

[EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
  But as I said in my first post, it's simple when you know the amount
  of data that you're going to receive, or when you'll receive data
  until the remote peer closes the connection. But what about receiving
  a message with undetermined length in a connection that you don't want
  to close?

You obviously need some sort of protocol.  Here is some code (taken
from a real project and modified a bit) which returns \r\n seperated
lines from a socket as they arrive which is a very simple (but
widespread) protocol.

self.rx_buf is set to  in the initialisation
self.sock is the socket

def rx_line(self):
message = None
while 1:
pos = self.rx_buf.find(\r\n)
if pos = 0:
message = self.rx_buf[:pos]
self.rx_buf = self.rx_buf[pos+2:]
break
try:
rx = self.sock.recv(4096)
except socket.error, e:
self.sock = None
raise ServerNetworkException(e)
if len(rx) == 0:
self.sock = None
raise ServerDisconnectedException()
self.rx_buf += rx
return message

Sorry I mis-understood your original post!

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Re: SWIG Python undefined reference

2008-04-29 Thread Soren


Ok I found out how to do it using:

gcc -Ic:\python24\include -Lc:\python24\libs --shared example_wrap.c
example.c -lpython24 -o _example.pyd

but now I get a dynamic module does not define init function error
when I try to import it into python..

Anyone??

Soren
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Re: Why is None = 0

2008-04-29 Thread Duncan Booth

=?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?= [EMAIL PROTECTED] wrote:

 (FWIW, in 2.x, x=4?, it's None  numbers  anything else;
 numbers are ordered by value, everything else is ordered
 by type name, then by address, unless comparison functions
 are implemented).

Quite apart from Jon pointing out that this isn't true for all cases when 
copmparing against None, the other half also isn't true:

 class C: pass

 C()  5
True

That happens at least in Python 2.5.2 on win32. Yet another reason to avoid 
old-style classes.

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Re: Receive data from socket stream

2008-04-29 Thread Nick Craig-Wood

Hrvoje Niksic [EMAIL PROTECTED] wrote:
  Nick Craig-Wood [EMAIL PROTECTED] writes:
 
   Note that appending to a string is almost never a good idea, since it
   can result in quadratic allocation.
 
  My aim was clear exposition rather than the ultimate performance!
 
  That would normally be fine.  My post wasn't supposed to pick
  performance nits, but to point out potentially quadratic behavior.
 
  Anyway str += was optimised in python 2.4 or 2.5 (forget which) wasn't
  it?
 
  That optimization works only in certain cases, when working with
  uninterned strings with a reference count of 1, and then only when the
  strings are in stored local variables, rather than in global vars or
  in slots.  And then, it only works in CPython, not in other
  implementations.  The optimization works by cheating -- breaking the
  immutable string abstraction in the specific cases in which it is
  provably safe to do so.
  http://utcc.utoronto.ca/~cks/space/blog/python/ExaminingStringConcatOpt
  examines it in some detail.

Ah, I didn't realise that - thanks for the interesting link.

For the example I gave, just a simple local variable the optimisation
kicks in.  I can see how you could easily migrate that to an instance
variable and the optimisation would no longer work, eg

$ python -m timeit -s 's=' 'for i in xrange(1): s+=x'
1000 loops, best of 3: 1.04 msec per loop

$ python -m timeit -s 'class A: pass' -s 'a=A(); a.s=' 'for i in 
xrange(1): a.s+=x'
10 loops, best of 3: 160 msec per loop

  Guido was reluctant to accept the patch that implements the
  optimization because he thought it would change the way people write
  code, a sentiment expressed in
  http://mail.python.org/pipermail/python-dev/2004-August/046702.html
  This discussion shows that he was quite right in retrospect.  (I'm not
  saying that the optimization is a bad thing, just that it is changing
  the recommended way of writing Python in a way that other
  implementations cannot follow.)

Certainly something I wasn't aware of before - thanks!

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Re: SWIG Python undefined reference

2008-04-29 Thread Soren

On Apr 29, 11:31 am, Soren [EMAIL PROTECTED] wrote:
 Ok I found out how to do it using:

 gcc -Ic:\python24\include -Lc:\python24\libs --shared example_wrap.c
 example.c -lpython24 -o _example.pyd

 but now I get a dynamic module does not define init function error
 when I try to import it into python..

 Anyone??

 Soren

In case anyone is having the same problem the solution for me was:

gcc example.c example_wrap.c -Ic:\python24\include -Lc:\python24\libs -
lpython24 -Xlinker -expoert-dynamic -shared -o _example.pyd

Soren
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Пояса массажеры с термо-эффе ктом

2008-04-29 Thread Золотой Клон

Неопреновый пояс для похудения из высококачественного материала
тонизирует тело и заставляет досадные жировые складки исчезать с
невероятной скоростью.
Принцип воздействия саунта-белта схож с давно известными неопреновыми
поясами для похудения. Но для того, чтобы неопреновый пояс помогал
худеть, в нем нужно интенсивно заниматься физической нагрузкой, тогда
идет быстрое расщепление жира в том месте, где надет неопреновый пояс.
Сауна-белт нужно всего лишь включить в розетку - все остальное он
сделает сам. Никаких физических нагрузок! При этом скорость
расщепления жира в несколько раз быстрее, чем при физической нагрузке
в неопреновом поясе!

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Learn python packaging for Ubuntu and Debian in the Ubuntu Open Week

2008-04-29 Thread SPE - Stani's Python Editor

Hi All,

If you wrote some python code that you want to package or know a cool
python application of which you like to make a deb installer, the
python packaging session is all for you! Do you develop some cross-
platform open source software and you want to give its popularity a
boost by bringing it to Ubuntu and Debian, read on! (Packages are what
installers are for Windows.)

This session will be hosted by the respected Emilio (pochu). I've
worked closely together with him (and others of the Debian PAPT team
like POX  ScottK) to make sure these packages landed well in Ubuntu
Hardy and Debian Unstable:
- Phatch (sudo apt-get install phatch, http://photobatch.stani.be)
- SPE (sudo apt-get install spe, http://pythonide.stani.be)

I've requested this session as I found there was almost no information
available tailored for python coders. I hope many people will attend.
The logs will be available here:
https://wiki.ubuntu.com/MeetingLogs/openweekhardy/PythonPackaging

The complete program of the Ubuntu Open Week is available here:
https://wiki.ubuntu.com/UbuntuOpenWeek

Feel free to comment or questions ahead of this session on this
thread. I am sure Emilio will read this thread.

See you there!
Stani
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Re: SWIG Python undefined reference

2008-04-29 Thread Paul Melis

Instead of manually trying to get all the options to gcc correct you 
might want to look at using distutils for compiling your extension.
See the SWIG documentation, section 30.2.2 
(http://www.swig.org/Doc1.3/Python.html#Python_nn6)


Paul

Soren wrote:

Hi,

I went through the SWIG tutorial for the example named simple.

I managed to get to the first step, creating example_wrap.c using
swig, and doing:
gcc -fpic -c example_wrap.c -IC:\python24\include  to create
example_wrap.o

But when I needed to compile the library file using:
gcc -shared example_wrap.o -o examplemodule.so I received a lot of
undefined reference compiler errors like:

example_wrap.o(.text+0x35a5):example_wrap.c: undefined reference to
`_imp__PyErr
_SetString'

there are many other similar errors all prefaced with _imp__Py, so I
am assuming there is a linker error with the python libraries. I have
adjusted my PATH variable to include all the python directories (libs/
dlls).

Does anyone here have any suggestions?

FILES FROM TUTORIAL:


//example.c
#include time.h
double My_variable = 3.0;

int fact(int n) {
if (n = 1) return 1;
else return n*fact(n-1);
}

int my_mod(int x, int y) {
return (x%y);
}

char *get_time()
{
time_t ltime;
time(ltime);
return ctime(ltime);
}
//***

//example.i
%module example
%{
/* Put header files here or function declarations like below */
extern double My_variable;
extern int fact(int n);
extern int my_mod(int x, int y);
extern char *get_time();
%}

extern double My_variable;
extern int fact(int n);
extern int my_mod(int x, int y);
extern char *get_time();
//***

//setup.py
from distutils.core import setup, Extension

setup(name='example',
version = '1.0',
ext_modules=[
Extension('example', ['example.c', 'example.i'])
])

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Re: Learn python packaging for Ubuntu and Debian in the Ubuntu Open Week

2008-04-29 Thread SPE - Stani's Python Editor

I forgot an important detail...

This session will be hosted Thu 1 May at 21.00 UTC on IRC in #ubuntu-
classroom.
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Zope/DTML Infuriating...

Hello Everyone.

I am relatively new to Zope(using it for a work project) and I was
wondering if someone here could help me out or at least refer me to a
decent documentationg for Zope/DTML/Python (at the detail level of
php.net or Java API reference).  
http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/
isn't really detailed enough for my taste. if it doesn't contain a
exhautive description of all available base classes it's simply no
good as a reference resource.

Anyway I have the following problem. I'm using zope 2.9 and I would
expect the following dtml code to yield a list containing main1, main2
etc.

dtml-let prefix='main'
ul
dtml-in expr=_.range(1,10)
  lidtml-var expr=_['prefix'] + _['sequence-item']/li
/dtml-in
/ul
/dtml-let

But it doesn't work(and yes i know that i could simply do ... dtml-
var prefixdtml-var sequence-item..., but that's not what i need).
I've the checked that i'm referring to the variables correctly, so the
only explanation i can come up with, is that '+' doesn't result in a
string concatenation (with implicit typecast to string of the integer
variable(this is a interpreted language after all)). It apparently
works in other cases but for some reason not here. I get the following
cryptical error message which makes me none the wiser.

An error was encountered while publishing this resource.

Error Type: AttributeError
Error Value: 'NoneType' object has no attribute 'group'

I would appreciate any feedback you might have regarding this. Thanks
in Advance.


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Re: Zope/DTML Infuriating...

2008-04-29 Thread Marco Mariani


Jens wrote:


I've the checked that i'm referring to the variables correctly, so the
only explanation i can come up with, is that '+' doesn't result in a
string concatenation (with implicit typecast to string of the integer
variable(this is a interpreted language after all)).


No, sorry. You really need to read the python tutorial at the very least.
You might have wrong assumptions from previous PHP experiences.

 'x'+4
Traceback (most recent call last):
  File stdin, line 1, in module
TypeError: cannot concatenate 'str' and 'int' objects


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Bollywood, Asian, Indie Films And More.

2008-04-29 Thread sureka


Bollywood, Asian, Indie Films And More.

http://besthotmovies.blogspot.com/
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Re: Given a string - execute a function by the same name

Bruno,

Thank you for your detailed analysis. I learned a lot about Python
reading everyone's responses.

For development I'm using #5: globals().get(func) because its
seamless to add additional functionality.

But when I release into production I'm going to shift to #3: Place all
my functions in dictionary and lookup the function to be called. This
technique will allow me to precisely control the dynamic nature of my
application.

Thanks again to everyone who contributed on this thread.

Regards,
Malcolm
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Re: Zope/DTML Infuriating...

On Apr 29, 1:59 pm, Marco Mariani [EMAIL PROTECTED] wrote:
 Jens wrote:
  I've the checked that i'm referring to the variables correctly, so the
  only explanation i can come up with, is that '+' doesn't result in a
  string concatenation (with implicit typecast to string of the integer
  variable(this is a interpreted language after all)).

 No, sorry. You really need to read the python tutorial at the very least.
 You might have wrong assumptions from previous PHP experiences.

   'x'+4
 Traceback (most recent call last):
    File stdin, line 1, in module
 TypeError: cannot concatenate 'str' and 'int' objects
  
... and the non snobby answer would have been:

...  dtml-var expr=_['prefix'] + str(_['sequence-item'])
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Re: How to unget a line when reading from a file/stream iterator/generator?

Duncan,

 If speed is an issue then it may be better to avoid the test altogether ... 
 snipped

Thanks for your suggestion.

Regards,
Malcolm
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Re: Zope/DTML Infuriating...

On Apr 29, 1:59 pm, Marco Mariani [EMAIL PROTECTED] wrote:
 Jens wrote:
  I've the checked that i'm referring to the variables correctly, so the
  only explanation i can come up with, is that '+' doesn't result in a
  string concatenation (with implicit typecast to string of the integer
  variable(this is a interpreted language after all)).

 No, sorry. You really need to read the python tutorial at the very least.
 You might have wrong assumptions from previous PHP experiences.

   'x'+4
 Traceback (most recent call last):
    File stdin, line 1, in module
 TypeError: cannot concatenate 'str' and 'int' objects
  
... and the non snobby answer would have been:

...  dtml-var expr=_['prefix'] + str(_['sequence-item'])
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Re: simple chemistry in python

2008-04-29 Thread baoilleach

If you are familiar with parsing XML, much of the data you need is
stored in the following file:
http://bodr.svn.sourceforge.net/viewvc/*checkout*/bodr/trunk/bodr/elements/elements.xml?revision=34content-type=text%2Fplain

This file is part of the Blue Obelisk Data Repository, an effort by
several chemistry software developers to share common information. If
you have any further questions, please email blueobelisk-
[EMAIL PROTECTED]

Noel

On Apr 29, 8:48 am, Astan Chee [EMAIL PROTECTED] wrote:
Hi,
Im looking for a python module to do simple chemistry things. Things
like, finding the name of elements given the atomic number (and vice
versa); what state the given matter is in depending on certain
parameters; maybe even color of certain elements or even calculating the
result of combining certain elements.
I was looking for something simple, but everything I see seems to be a
full blown chemistry set.
I know I can probably spend a day doing this one element at a time, but
I was wondering if there is already something like this done in a small
scale?
Thanks for any information
Astan

--
Formulations of number theory: Complete, Consistent, Non-trivial. Choose
two.

Animal Logichttp://www.animallogic.com

Please think of the environment before printing this email.

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Re: Zope/DTML Infuriating...

2008-04-29 Thread Marco Mariani


Jens wrote:


You might have wrong assumptions from previous PHP experiences.

  'x'+4
Traceback (most recent call last):
   File stdin, line 1, in module
TypeError: cannot concatenate 'str' and 'int' objects
 

... and the non snobby answer would have been:

...  dtml-var expr=_['prefix'] + str(_['sequence-item'])



Sorry. Not trying to be snobbish, only in a hurry.

That answer would have been less useful, because there are TONS of 
details in the python tutorial, that set the language apart from its 
scripting cousins.
Reading the syntax and thinking yeah, got it, boring, next chapter is 
a common mistake I've also made sometime, especially with python when 
I've been deceived by its apparent simplicity.

Then, later, the same happened with Javascript, of course.
And it's bound to happen again, as much as I'll try to be careful :-(
--
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Re: Given a string - execute a function by the same name

2008-04-29 Thread Arnaud Delobelle

On 29 Apr, 13:10, [EMAIL PROTECTED] wrote:
 Bruno,

 Thank you for your detailed analysis. I learned a lot about Python
 reading everyone's responses.

 For development I'm using #5: globals().get(func) because its
 seamless to add additional functionality.

 But when I release into production I'm going to shift to #3: Place all
 my functions in dictionary and lookup the function to be called. This
 technique will allow me to precisely control the dynamic nature of my
 application.

 Thanks again to everyone who contributed on this thread.

 Regards,
 Malcolm

You could avoid #5 from the start using a decorator:

functions = {}

def register(func):
functions[func.__name__] = func
return func

@register
def foo(): print Foo!

@register
def bar(): print Bar!


 functions
{'foo': function foo at 0x6f2f0, 'bar': function bar at 0x6f330}
 functions['bar']()
Bar!

--
Arnaud
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Using Python to verify streaming tv/radio station links

2008-04-29 Thread donnyf

Hi guys. I've put together a website ( http://worldwidemediaproject.com
) that is a database of internet streaming tv/radio stations from
around the world. I have built the site with all users in mind. The
site should be Linux, Unix, Mac, Win, etc friendly as I do not hide
the actual stream link or force the user to use an embedded player to
view/listen to the streams. In fact, you can even download the streams
you like as a playlist that you can load into your player of choice
(and even a few PVR software plugins).

In building the site, I have enabled the user to report stations that
are nonfunctional. In addition to this, I would like to automate the
checking of the links in the database as well as any user submitted
links. What I am wanting to do is to script this with a simple for
loop which would loop through a file containing the station stream
link as well as the station id. I'd like to pass each through some
kind of verification function and if a connection is made then the
stream is good and move on to the next. If the connection fails then
the stream is bad, I would like to add the station id to a file
containing all 'nonfunctional' streams that I can later automate to
flag the stations.

Is there an easy way to use python to verify a stream exists? I've
done a little experimenting with sockets and was able to connect to my
usenet server and talk to it, but I don't really know what's involved
with connecting to streaming windows media, real media and winamp
servers or what to expect as far as connection status messages.   I am
not unfamiliar with python, but I am far from an expert. If anyone
could give me a hand with this or give me a push in the right
direction I would greatly appreciate it!

Many thanks!
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Re: Goodbying Spaces

2008-04-29 Thread Victor Subervi

On Fri, Apr 25, 2008 at 4:29 PM, Luis Zarrabeitia [EMAIL PROTECTED] wrote:


 Whats the result of using id.strip()?:

 In [1]:  asdfasdf   .strip()
 Out[1]: 'asdfasdf'

 It should work, I guess...


It didn´t for some reason. That was the first thing I tried.



 Btw, you can write your code without using len in a cleaner way:

 try:
  if id[0] == ' ':
id = id[1:]   # Note this slice notation...
 except:
  pass

 try:
  if id[-1] == ' ':   # id[-1] would be the last character
id = id[:-1]  # Again, a slice with only one argument
 except:
  pass


Oh, yeah. Forgot about that. Thanks!
Victor
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Re: Given a string - execute a function by the same name

2008-04-29 Thread Max M


[EMAIL PROTECTED] skrev:

Bruno,




But when I release into production I'm going to shift to #3: Place all
my functions in dictionary and lookup the function to be called. This
technique will allow me to precisely control the dynamic nature of my
application.


Just one tiny note: What you will be doing is a variation of the factory 
pattern.


So this search might give you some new ideas:

http://www.google.dk/search?hl=enq=python+factory+pattern


--

hilsen/regards Max M, Denmark

http://www.mxm.dk/
IT's Mad Science

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Re: Zope/DTML Infuriating...

On Apr 29, 2:45 pm, Marco Mariani [EMAIL PROTECTED] wrote:
 Jens wrote:
  You might have wrong assumptions from previous PHP experiences.

    'x'+4
  Traceback (most recent call last):
     File stdin, line 1, in module
  TypeError: cannot concatenate 'str' and 'int' objects

  ... and the non snobby answer would have been:

  ...  dtml-var expr=_['prefix'] + str(_['sequence-item'])

 Sorry. Not trying to be snobbish, only in a hurry.

 That answer would have been less useful, because there are TONS of
 details in the python tutorial, that set the language apart from its
 scripting cousins.
 Reading the syntax and thinking yeah, got it, boring, next chapter is
 a common mistake I've also made sometime, especially with python when
 I've been deceived by its apparent simplicity.
 Then, later, the same happened with Javascript, of course.
 And it's bound to happen again, as much as I'll try to be careful :-(

Hey no worriest. Is this the tutorial you're referring to:

http://docs.python.org/lib/typesmapping.html

Is there anything better? I miss the discussion and examples that
accompany
most entries in php.net.
--
http://mail.python.org/mailman/listinfo/python-list

Re: Zope/DTML Infuriating...

On Apr 29, 2:45 pm, Marco Mariani [EMAIL PROTECTED] wrote:
 Jens wrote:
  You might have wrong assumptions from previous PHP experiences.

    'x'+4
  Traceback (most recent call last):
     File stdin, line 1, in module
  TypeError: cannot concatenate 'str' and 'int' objects

  ... and the non snobby answer would have been:

  ...  dtml-var expr=_['prefix'] + str(_['sequence-item'])

 Sorry. Not trying to be snobbish, only in a hurry.

 That answer would have been less useful, because there are TONS of
 details in the python tutorial, that set the language apart from its
 scripting cousins.
 Reading the syntax and thinking yeah, got it, boring, next chapter is
 a common mistake I've also made sometime, especially with python when
 I've been deceived by its apparent simplicity.
 Then, later, the same happened with Javascript, of course.
 And it's bound to happen again, as much as I'll try to be careful :-(

Hey no worriest. Is this the tutorial you're referring to:

http://docs.python.org/lib/typesmapping.html

Is there anything better? I miss the discussion and examples that
accompany
most entries in php.net.
--
http://mail.python.org/mailman/listinfo/python-list

Simple TK Question - refreshing the canvas when not in focus

Hey everyone!
  I'm not very good with Tk, and I am using a very simple canvas to
draw some pictures (this relates to that nokia screen emulator I had a
post about a few days ago).

Anyway, all is well, except one thing.  When I am not in the program,
and the program receives a draw command (from a FIFO pipe), the canvas
does not refresh until I click into the program. How do I force it to
refresh, or force the window to gain focus?  It seems like pretty
common behavior, but a few things that I've tried have not worked.

Class screen():
def __init__(self):
self.root = Tkinter.Tk()
self.root.title('Nokia Canvas')
self.canvas = Tkinter.Canvas(self.root, width =130,
height=130)
self.canvas.pack()
self.root.mainloop()

Then somewhere a long the line I do:
self.canvas.create_line(args[0], args[1], args[2],
args[3], fill=color)
self.canvas.pack()

I've tried self.root.set_focus(), self.root.force_focus(),
self.canvas.update(), etc. but I can't get it.
Thanks!
Blaine
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Re: Zope/DTML Infuriating...

On Apr 29, 2:45 pm, Marco Mariani [EMAIL PROTECTED] wrote:
 Jens wrote:
  You might have wrong assumptions from previous PHP experiences.

    'x'+4
  Traceback (most recent call last):
     File stdin, line 1, in module
  TypeError: cannot concatenate 'str' and 'int' objects

  ... and the non snobby answer would have been:

  ...  dtml-var expr=_['prefix'] + str(_['sequence-item'])

 Sorry. Not trying to be snobbish, only in a hurry.

 That answer would have been less useful, because there are TONS of
 details in the python tutorial, that set the language apart from its
 scripting cousins.
 Reading the syntax and thinking yeah, got it, boring, next chapter is
 a common mistake I've also made sometime, especially with python when
 I've been deceived by its apparent simplicity.
 Then, later, the same happened with Javascript, of course.
 And it's bound to happen again, as much as I'll try to be careful :-(

Hey no worriest. Is this the tutorial you're referring to:

http://docs.python.org/lib/typesmapping.html

Is there anything better? I miss the discussion and examples that
accompany
most entries in php.net.
--
http://mail.python.org/mailman/listinfo/python-list

Re: Why is None = 0

On Apr 29, 5:32 am, Duncan Booth [EMAIL PROTECTED] wrote:
 =?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?= [EMAIL PROTECTED] wrote:
  (FWIW, in 2.x, x=4?, it's None  numbers  anything else;
  numbers are ordered by value, everything else is ordered
  by type name, then by address, unless comparison functions
  are implemented).

 Quite apart from Jon pointing out that this isn't true for all cases when
 copmparing against None, the other half also isn't true:

  class C: pass
  C()  5

 True

 That happens at least in Python 2.5.2 on win32. Yet another reason to avoid
 old-style classes.

Sorry - but what are new style classes?
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Windows Printing using win32print

2008-04-29 Thread José Roberto

Olá KellyK!
I have read your comentary about how to print with python in windows using 
win32print. 
I have trying to use in my problem : print a figure (.jpg, .png...etc) could 
you help me?
Thanks a lot
JRoberto--
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Re: list.reverse()

2008-04-29 Thread Roy Smith

In article [EMAIL PROTECTED],
 Bruno Desthuilliers [EMAIL PROTECTED] wrote:

 Mark Bryan Yu a écrit :
  This set of codes works:
  
  x = range(5)
  x.reverse()
  x
  [4, 3, 2, 1, 0]
  
  But this doesn't:
  
  x = range(5).reverse()
  print x
  None
 
 This works just as expected - at least for anyone having read the doc.
 
  Please explain this behavior. range(5) returns a list from 0 to 4 and
  reverse just reverses the items on the list that is returned by
  range(5). Why is x None (null)?
 
 Because that's what list.reverse() returns. Call it a wart if you want 
 (FWIW, I do), but at least that's well documented.

The reasoning goes along the lines of, reverse in place is an expensive 
operation, so we don't want to make it too easy for people to do.  At 
least that's the gist of what I got out of the argument the many times it 
has come up.

And, yes, I agree with Bruno that it's a wart.

What you want to do is look at the reversed() function.  Not only does it 
return something (other than Null), but it is much faster because it 
doesn't have to store the reversed list anywhere.  What it returns is an 
iterator which walks the list in reverse order.  If you really want it as a 
list, you can turn it into one (with the list() constructor), or you can 
just iterate over it with a for loop.

Same with list.sort() vs. the global sorted().

 range(5)
[0, 1, 2, 3, 4]

 reversed(range(5))
listreverseiterator object at 0x6f8d0

 list(reversed(range(5)))
[4, 3, 2, 1, 0]

 for i in reversed(range(5)):
... print i
... 
4
3
2
1
0

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Re: list.reverse()

On Apr 29, 9:32 am, Roy Smith [EMAIL PROTECTED] wrote:
 In article [EMAIL PROTECTED],
  Bruno Desthuilliers [EMAIL PROTECTED] wrote:



  Mark Bryan Yu a écrit :
   This set of codes works:

   x = range(5)
   x.reverse()
   x
   [4, 3, 2, 1, 0]

   But this doesn't:

   x = range(5).reverse()
   print x
   None

  This works just as expected - at least for anyone having read the doc.

   Please explain this behavior. range(5) returns a list from 0 to 4 and
   reverse just reverses the items on the list that is returned by
   range(5). Why is x None (null)?

  Because that's what list.reverse() returns. Call it a wart if you want
  (FWIW, I do), but at least that's well documented.

 The reasoning goes along the lines of, reverse in place is an expensive
 operation, so we don't want to make it too easy for people to do.  At
 least that's the gist of what I got out of the argument the many times it
 has come up.

 And, yes, I agree with Bruno that it's a wart.

 What you want to do is look at the reversed() function.  Not only does it
 return something (other than Null), but it is much faster because it
 doesn't have to store the reversed list anywhere.  What it returns is an
 iterator which walks the list in reverse order.  If you really want it as a
 list, you can turn it into one (with the list() constructor), or you can
 just iterate over it with a for loop.

 Same with list.sort() vs. the global sorted().

  range(5)

 [0, 1, 2, 3, 4]

  reversed(range(5))

 listreverseiterator object at 0x6f8d0

  list(reversed(range(5)))

 [4, 3, 2, 1, 0]

  for i in reversed(range(5)):

 ... print i
 ...
 4
 3
 2
 1
 0



Check out this cool little trick I recently learned:
 x=range(5)
 x.reverse() or x
[4, 3, 2, 1, 0]

Useful for returning lists that you need to sort or reverse without
wasting that precious extra line :)

What it does: x.reverse() does the reverse and returns None.  or is
bitwise, so it sees that 'None' is not 'True' and then continues to
process the next operand, x.  x or'd with None will always be x (and x
has just been changed by the reverse()).  So you get the new value of
x :)

Blaine
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Re: Windows Printing using win32print

2008-04-29 Thread Tim Golden


José Roberto wrote:

Olá KellyK!
I have read your comentary about how to print with python in windows using win32print. 
I have trying to use in my problem : print a figure (.jpg, .png...etc) could you help me?


Does this help?

http://timgolden.me.uk/python/win32_how_do_i/print.html#rough_and_ready

TJG
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Re: Simple unicode-safe version of str(exception)?

2008-04-29 Thread Bjoern Schliessmann

Martin v. Löwis wrote:

 e is an exception object, not a Unicode object.

Er, sure, thanks for pointing that out. At first sight he should
substitute e with e.message then since he tries to convert to
string (for display?).

Regards,


Björn

-- 
BOFH excuse #366:

ATM cell has no roaming feature turned on, notebooks can't connect

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Issue with regular expressions

2008-04-29 Thread Julien

Hi,

I'm fairly new in Python and I haven't used the regular expressions
enough to be able to achieve what I want.
I'd like to select terms in a string, so I can then do a search in my
database.

query = ' some words  with and withoutquotes '
p = re.compile(magic_regular_expression)   $ --- the magic happens
m = p.match(query)

I'd like m.groups() to return:
('some words', 'with', 'and', 'without quotes')

Is that achievable with a single regular expression, and if so, what
would it be?

Any help would be much appreciated.

Thanks!!

Julien
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Re: Zope/DTML Infuriating...

2008-04-29 Thread Marco Mariani


Jens wrote:


Hey no worriest. Is this the tutorial you're referring to:

http://docs.python.org/lib/typesmapping.html

Is there anything better?


That's the library reference - the one to keep under the pillow.
It also documents the core -- i.e. builtin objects.


As for the language semantics, I suggest the whole of

http://docs.python.org/tut/

then a bit of

http://docs.python.org/ref/ref.html

A good alternative could be the new edition of Python in a Nutshell.
The author has a very clear style and leaves no corners uncovered.



I miss the discussion and examples that accompany most entries in php.net.


This is a post + comments about strong/weak typing, although not an 
in-depth analyses.


http://www.artima.com/forums/flat.jsp?forum=106thread=7590

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Re: list.reverse()

2008-04-29 Thread Bruno Desthuilliers


Roy Smith a écrit :
(snip)

The reasoning goes along the lines of, reverse in place is an expensive 
operation, so we don't want to make it too easy for people to do.  At 
least that's the gist of what I got out of the argument the many times it 
has come up.


IIRC, it's more along the line of reverse in place is a *destructive* 
operation, so we don't want to make it too easy for people to forget 
about it.


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SSL through python. possible ?

2008-04-29 Thread TkNeo

I need to do SSL file transfer using python? Is there a library i can
use ?

Thanks.
--
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Re: Zope/DTML Infuriating...

2008-04-29 Thread Christian Heimes

Jens schrieb:
 Hello Everyone.
 
 I am relatively new to Zope(using it for a work project) and I was
 wondering if someone here could help me out or at least refer me to a
 decent documentationg for Zope/DTML/Python (at the detail level of
 php.net or Java API reference).  
 http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/
 isn't really detailed enough for my taste. if it doesn't contain a
 exhautive description of all available base classes it's simply no
 good as a reference resource.

Are you forced to use DTML for the job? ZPT are far superior and easier
to work with, if you have to output HTML.

Christian

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Re: simple chemistry in python

2008-04-29 Thread Aaron Watters

On Apr 29, 8:41 am, baoilleach [EMAIL PROTECTED] wrote:
 This file is part of the Blue Obelisk Data Repository, an effort by
 several chemistry software developers to share common information

This ref is incredibly cool.  Is there a guide or
meta-index for similar open scientific data repositories
(not web search forms: downloadable complete data)?
   -- Aaron Watters

===
http://www.xfeedme.com/nucular/pydistro.py/go?FREETEXT=valence
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Re: SSL through python. possible ?

2008-04-29 Thread Mike Driscoll

On Apr 29, 8:56 am, TkNeo [EMAIL PROTECTED] wrote:
 I need to do SSL file transfer using python? Is there a library i can
 use ?

 Thanks.

Did you try Google? Here's a few links that look like possibilities:

http://sandbox.rulemaker.net/ngps/m2/
http://pypgsql.sourceforge.net/misc/python-ssl.html
http://pypi.python.org/pypi/ssl/
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/117004

HTH

Mike
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Re: So you think PythonCard is old? Here's new wine in an old bottle.

2008-04-29 Thread John Henry

On Apr 29, 1:57 am, Panyasan [EMAIL PROTECTED] wrote:
 Hi,

 I am one of the two developers working on the xml-to-javascript
 converter (qxtransformer) John has mentioned and we are thrilled that
 our project has found a use in the PythonCard community.

 However, we have a problem getting PythonCard to work on our Macs (Mac
 OS 10.5 Leopard). We should probably be asking this on the PythonCard
 help list, but since the list seems to be somewhat deserted (very few
 posts) and John is active here and people seem to be using PythonCard,
 maybe someone has an idea. It might be very simple and stupid - I have
 never worked with python before.

 I am using
 - PythonCard 0.8.2 release on Leopard, which is copied by setup.py to /
 Library/Python/2.5/site-packages
 - John's layoutEditor package, (http://qxtransformer.googlegroups.com/
 web/layoutEditor.zip)

 PythonCard email list says that Leopard and PythonCard 0.8.2 seem to
 like each other generally:

 http://sourceforge.net/mailarchive/forum.php?thread_name=EE5213D5-A00...

 and I can get the examples working. However, when I start John's
 modified layoutEditor.py, I get an empty window and the following
 error is thrown:

 no resource file for /Users/bibliograph/Programme/PythonCard/tools/
 layoutEditor/multipropertyEditor
 Traceback (most recent call last):
   File /BinaryCache/wxWidgets/wxWidgets-11~57/Root/System/Library/
 Frameworks/Python.framework/Versions/2.5/Extras/lib/python/wx-2.8-mac-
 unicode/wx/_core.py, line 14095, in lambda
   File /Library/Python/2.5/site-packages/PythonCard/tools/
 layoutEditor/layoutEditor.py, line 153, in on_initialize
 self.propertyEditorWindow = model.childWindow(self,
 PropertyEditor)
   File /Library/Python/2.5/site-packages/PythonCard/model.py, line
 213, in childWindow
 rsrc = resource.ResourceFile(filename).getResource()
   File /Library/Python/2.5/site-packages/PythonCard/resource.py,
 line 45, in __init__
 self.dictionary = util.readAndEvalFile(rsrcFileName)
   File /Library/Python/2.5/site-packages/PythonCard/util.py, line
 39, in readAndEvalFile
 f = open(filename)
 TypeError: coercing to Unicode: need string or buffer, NoneType found

 there is a file PythonCard/tools/layoutEditor/modules/
 multipropertyEditor.rsrc.py

 When I resize the window, I get the following errors

 Tue Apr 29 10:48:08 noname Python[40440] Error: CGContextConcatCTM:
 invalid context
 Tue Apr 29 10:48:08 noname Python[40440] Error: CGContextSaveGState:
 invalid context
 Tue Apr 29 10:48:08 noname Python[40440] Error: doClip: invalid
 context
 Tue Apr 29 10:48:08 noname Python[40440] Error: CGContextSaveGState:
 invalid context
 Tue Apr 29 10:48:08 noname Python[40440] Error:
 CGContextSetBlendMode: invalid context
 Tue Apr 29 10:48:08 noname Python[40440] Error:
 CGContextSetShouldAntialias: invalid context
 Traceback (most recent call last):
   File /Library/Python/2.5/site-packages/PythonCard/model.py, line
 884, in _dispatch
 handler(background, aWxEvent)
   File /Library/Python/2.5/site-packages/PythonCard/tools/
 layoutEditor/layoutEditor.py, line 560, in on_size
 self.createDC()
   File /Library/Python/2.5/site-packages/PythonCard/tools/
 layoutEditor/layoutEditor.py, line 556, in createDC
 dc.SetLogicalFunction(wx.INVERT)
   File /BinaryCache/wxWidgets/wxWidgets-11~57/Root/System/Library/
 Frameworks/Python.framework/Versions/2.5/Extras/lib/python/wx-2.8-mac-
 unicode/wx/_gdi.py, line 4079, in SetLogicalFunction
 wx._core.PyAssertionError: C++ assertion status == noErr failed
 at ../src/mac/carbon/graphics.cpp(1324) in EnsureIsValid(): Cannot
 nest wxDCs on the same window

 Thanks for any pointers,

 Christian

Christian,

It appears you're missing a file.  Where did you placed my program?  I
see that there are two places being mentioned:

 no resource file for /Users/bibliograph/Programme/PythonCard/tools/
 layoutEditor/multipropertyEditor

and

 File /Library/Python/2.5/site-packages/PythonCard/tools/
 layoutEditor/layoutEditor.py, line 556, in createDC

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Re: Issue with regular expressions

2008-04-29 Thread Paul McGuire

On Apr 29, 8:46 am, Julien [EMAIL PROTECTED] wrote:
 I'd like to select terms in a string, so I can then do a search in my
 database.

 query = '     some words  with and without    quotes     '
 p = re.compile(magic_regular_expression)   $ --- the magic happens
 m = p.match(query)

 I'd like m.groups() to return:
 ('some words', 'with', 'and', 'without quotes')

 Is that achievable with a single regular expression, and if so, what
 would it be?


Julien -

I dabbled with re's for a few minutes trying to get your solution,
then punted and used pyparsing instead.  Pyparsing will run slower
than re, but many people find it much easier to work with readable
class names and instances rather than re's typoglyphics:

from pyparsing import OneOrMore, Word, printables, dblQuotedString,
removeQuotes

# when a quoted string is found, remove the quotes,
# then strip whitespace from the contents
dblQuotedString.setParseAction(removeQuotes,
   lambda s:s[0].strip())

# define terms to be found in query string
term = dblQuotedString | Word(printables)
query_terms = OneOrMore(term)

# parse query string to extract terms
query = ' some words  with and withoutquotes '
print tuple(query_terms.parseString(query))

Gives:
('some words', 'with', 'and', 'withoutquotes')

The pyparsing wiki is at http://pyparsing.wikispaces.com.  You'll find
an examples page that includes a search query parser, and pointers to
a number of online documentation and presentation sources.

-- Paul
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Re: list.reverse()

2008-04-29 Thread Paul McGuire

On Apr 28, 1:12 pm, Mark Bryan Yu [EMAIL PROTECTED] wrote:
 This set of codes works:

  x = range(5)
  x.reverse()
  x

 [4, 3, 2, 1, 0]


You can also use list slicing to get a reversed list:

 x = range(5)
 x
[0, 1, 2, 3, 4]
 x[::-1]
[4, 3, 2, 1, 0]

-- Paul
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Colors for Rows

2008-04-29 Thread Victor Subervi

Hi;

why doesn't this work?

z = 3

for d in id:

  z += 1

  if z % 4 == 0:

bg = '#ff'

  elif z % 4 == 1:

bg = '#d2d2d2'

  elif z % 4 == 2:

bg = '#F6E5DF'

  else:

bg = '#EAF8D5'

try:

  print 'tr bgcolor=%s\n' % bg

except:

  print 'tr\n'



It never increments z! Yet, if I print z, it will increment and change the
bgcolor! Why?!

Victor
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Re: Simple TK Question - refreshing the canvas when not in focus

2008-04-29 Thread Eric Brunel


On Tue, 29 Apr 2008 15:22:12 +0200, blaine [EMAIL PROTECTED] wrote:


Hey everyone!
  I'm not very good with Tk, and I am using a very simple canvas to
draw some pictures (this relates to that nokia screen emulator I had a
post about a few days ago).

Anyway, all is well, except one thing.  When I am not in the program,
and the program receives a draw command (from a FIFO pipe), the canvas
does not refresh until I click into the program. How do I force it to
refresh, or force the window to gain focus?  It seems like pretty
common behavior, but a few things that I've tried have not worked.

Class screen():
def __init__(self):
self.root = Tkinter.Tk()
self.root.title('Nokia Canvas')
self.canvas = Tkinter.Canvas(self.root, width =130,
height=130)
self.canvas.pack()
self.root.mainloop()

Then somewhere a long the line I do:
self.canvas.create_line(args[0], args[1], args[2],
args[3], fill=color)
self.canvas.pack()


Unrelated question: why are you doing a .pack() again here? Packing the  
widget just inserts it at the right place in its container, so you only  
have to do it once. So the one you did in __init__ is enough.



I've tried self.root.set_focus(), self.root.force_focus(),
self.canvas.update(), etc. but I can't get it.


IIRC:
- self.root.set_focus() will only work if your application already has the  
focus, so it's not what you need here.
- self.root.force_focus() is usually considered as evil: it'll give the  
focus to your application whatever the user is doing, which is usually  
*really* annoying. So I guess a lot of window managers just refuse to do  
it; this may be what happens here.


But self.canvas.update() should work. If it doesn't, then there are  
probably limitations on your platform that prevents it to work... Do you  
happen to have other applications that can update their display while they  
don't have the focus? Do they have the same problem? If they do, it's  
probably a limitation on the platform and I guess you won't be able to do  
anything about it... BTW, what platform are you on?



Thanks!
Blaine


HTH
--
python -c print ''.join([chr(154 - ord(c)) for c in  
'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])

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Re: Question regarding Queue object

2008-04-29 Thread Terry

On Apr 29, 3:01 pm, Dennis Lee Bieber [EMAIL PROTECTED] wrote:
 On Sun, 27 Apr 2008 03:27:59 -0700 (PDT), Terry [EMAIL PROTECTED]
 declaimed the following in comp.lang.python:

  I'm trying to implement a message queue among threads using Queue. The
  message queue has two operations:
  PutMsg(id, msg) #  this is simple, just combine the id and msg as one
  and put it into the Queue.
  WaitMsg(ids, msg) # this is the hard part

  WaitMsg will get only msg with certain ids, but this is not possible
  in Queue object, because Queue provides no method to peek into the
  message queue and fetch only matched item.

  Now I'm using an ugly solution, fetch all the messages and put the not
  used ones back to the queue. But I want a better performance. Is there
  any alternative out there?

 Create your own queue class -- including locking objects.

 Implement the queue itself (I've not looked at how Queue.Queue is
 really done) as a priority queue (that is, a simple list ordered by your
 ID -- new items are inserted after all existing items with the same or
 lower ID number).

 Surround list manipulations with a lock based on a Condition.

 Now, the trick -- the .get(ID) sequence being something like (this
 is pseudo-code):

 while True:
 self.condition.acquire()
 scan self.qlist for first entry with ID
 if found:
 remove entry from self.qlist
 self.condition.release()
 return entry
 self.condition.wait()

 -=-=-=-=-   the .put(ID, data) looks like

 self.condition.acquire()
 scan self.qlist for position to insert (ID, data)
 self.condition.notifyAll()
 self.condition.release()

 -=-=-=-=-

 Essentially, if the first pass over the list does not find an entry
 to return, it waits for a notify to occur... and notification will only
 occur when some other thread puts new data into the list.
 --
 WulfraedDennis Lee Bieber   KD6MOG
 [EMAIL PROTECTED]  [EMAIL PROTECTED]
 HTTP://wlfraed.home.netcom.com/
 (Bestiaria Support Staff:   [EMAIL PROTECTED])
 HTTP://www.bestiaria.com/

Yes, now I have a similar solution in my code. But after read the
stackless python, I'm thinking if I can move to stackless, which might
improve the performance of my thread. Because I'm trying to simulate
some behavior of the real world (trading), I believe there will be a
lot of threads in the future in my program.
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Re: Issue with regular expressions

2008-04-29 Thread Robert Bossy


Julien wrote:

Hi,

I'm fairly new in Python and I haven't used the regular expressions
enough to be able to achieve what I want.
I'd like to select terms in a string, so I can then do a search in my
database.

query = ' some words  with and withoutquotes '
p = re.compile(magic_regular_expression)   $ --- the magic happens
m = p.match(query)

I'd like m.groups() to return:
('some words', 'with', 'and', 'without quotes')

Is that achievable with a single regular expression, and if so, what
would it be?

Any help would be much appreciated.
  

Hi,

I think re is not the best tool for you. Maybe there's a regular 
expression that does what you want but it will be quite complex and hard 
to maintain.


I suggest you split the query with the double quotes and process 
alternate inside/outside chunks. Something like:


import re

def spulit(s):
   inq = False
   for term in s.split(''):
   if inq:
   yield re.sub('\s+', ' ', term.strip())
   else:
   for word in term.split():
   yield word
   inq = not inq

for token in spulit(' some words  with and withoutquotes '):
   print token
  
 
Cheers,

RB
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Re: Question regarding Queue object

2008-04-29 Thread Terry

On Apr 29, 4:32 pm, [EMAIL PROTECTED] wrote:
 On 27 Apr, 12:27, Terry [EMAIL PROTECTED] wrote:



  Hello!

  I'm trying to implement a message queue among threads using Queue. The
  message queue has two operations:
  PutMsg(id, msg) #  this is simple, just combine the id and msg as one
  and put it into the Queue.
  WaitMsg(ids, msg) # this is the hard part

  WaitMsg will get only msg with certain ids, but this is not possible
  in Queue object, because Queue provides no method to peek into the
  message queue and fetch only matched item.

  Now I'm using an ugly solution, fetch all the messages and put the not
  used ones back to the queue. But I want a better performance. Is there
  any alternative out there?

  This is my current solution:

  def _get_with_ids(self,wait, timeout, ids):
  to = timeout
  msg = None
  saved = []
  while True:
  start = time.clock()
  msg =self.q.get(wait, to)
  if msg and msg['id'] in ids:
  break;
  # not the expecting message, save it.
  saved.append(msg)
  to = to - (time.clock()-start)
  if to = 0:
  break
  # put the saved messages back to the queue
  for m in saved:
  self.q.put(m, True)
  return msg

  br, Terry

 Wy put them back in the queue?
 You could have a defaultdict with the id as key and a list of
 unprocessed messages with that id as items.
 Your _get_by_ids function could first look into the unprocessed
 messages for items with that ids and then
 look into the queue, putting any unprocessed item in the dictionary,
 for later processing.
 This should improve the performances, with a little complication of
 the method code (but way simpler
 that implementing your own priority-based queue).

 Ciao
 -
 FB

Yes, this will improve the performance. And I can see there's a
problem in my current implementation. The order of the message might
be changed if I put the saved message back to the end of the queue.
This may cause some confusion later, though I don't want to depend too
much on the message orders.

And you remind me one thing -- I need to implement 'priority' for
messages, so that the message with highest priority will tend to be
fetched first. OMG, this is going to be much more complicated then I
have expected.

Thanks for your suggestion. And I hope this will also work when I move
to stackless.
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Re: Issue with regular expressions

2008-04-29 Thread cokofreedom

| #  Double Quote Text 
|# match a double quote
|(#  - Two Possiblities:
|\\.  # match two backslashes followed by anything
(include newline)
||# OR
|[^] # do not match a single quote
|)*   #  - from zero to many
|# finally match a double quote
|
||#  OR 
|
| #  Single Quote Text 
|'# match a single quote
|(#  - Two Possiblities:
|\\.  # match two backslashes followed by anything
(include newline)
||# OR
|[^'] # do not match a single quote
|)*   #  - from zero to many
|'# finally match a single quote
|, DOTALL|VERBOSE)

Used this before (minus those | at the beginning) to find double
quotes and single quotes in a file (there is more to this that looks
for C++ and C style quotes but that isn't needed here), perhaps you
can take it another step to not do changes to these matches?

r(\\.|[^])*|'(\\.|[^'])*', DOTALL)

is it in a single line :)
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Re: Given a string - execute a function by the same name

Hi Max,

Thank you for pointing out the pattern of my request.

Using your google query
(http://www.google.dk/search?hl=enq=python+factory+pattern) I found the
following description of what I'm doing.

Command Dispatch Pattern
http://www.suttoncourtenay.org.uk/duncan/accu/pythonpatterns.html#id26

Regards,
Malcolm
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Re: Issue with regular expressions

2008-04-29 Thread Paul Melis


Julien wrote:

Hi,

I'm fairly new in Python and I haven't used the regular expressions
enough to be able to achieve what I want.
I'd like to select terms in a string, so I can then do a search in my
database.

query = ' some words  with and withoutquotes '
p = re.compile(magic_regular_expression)   $ --- the magic happens
m = p.match(query)

I'd like m.groups() to return:
('some words', 'with', 'and', 'without quotes')

Is that achievable with a single regular expression, and if so, what
would it be?


Here's one way with a single regexp plus an extra filter function.

 import re
 p = re.compile('(([^]+))|([^ \t]+)')
 m = p.findall(q)
 m
[('  some words', '  some words', ''), ('', '', 'with'), ('', '', 
'and'), ('withoutquotes   ', 'withoutquotes   ', '')]

 def f(t):
... if t[0] == '':
... return t[2]
... else:
... return t[1]
...
 map(f, m)
['  some words', 'with', 'and', 'withoutquotes   ']

If you want to strip away the leading/trailing whitespace from the 
quoted strings, then change the last return statement to

be return t[1].strip().

Paul
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Re: list.reverse()

2008-04-29 Thread Diez B. Roggisch



The reasoning goes along the lines of, reverse in place is an expensive 
operation, so we don't want to make it too easy for people to do.  At 
least that's the gist of what I got out of the argument the many times it 
has come up.



It's not about the storage - it is about the in-place-modification. The 
reasioning is that people otherwise could assume that


a = [1, 2]
b = a.reverse()
assert a[0] == 1 and b[0] == 2

would hold, but instead of course a is changed.

Using reversed as

b = reversed(a)

will make that assumption hold.

Diez
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Re: Issue with regular expressions

2008-04-29 Thread Hrvoje Niksic

Julien [EMAIL PROTECTED] writes:

 I'm fairly new in Python and I haven't used the regular expressions
 enough to be able to achieve what I want.
 I'd like to select terms in a string, so I can then do a search in my
 database.

 query = ' some words  with and withoutquotes '
 p = re.compile(magic_regular_expression)   $ --- the magic happens
 m = p.match(query)

I don't think you can achieve this with a single regular expression.
Your best bet is to use p.findall() to find all plausible matches, and
then rework them a bit.  For example:

p = re.compile(r'[^]*|[\S]+')
p.findall(query)
['  some words', 'with', 'and', 'withoutquotes   ']

At that point, you can easily iterate through the list and remove the
quotes and excess whitespace.
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Re: Issue with regular expressions

2008-04-29 Thread harvey . thomas

On Apr 29, 2:46 pm, Julien [EMAIL PROTECTED] wrote:
 Hi,

 I'm fairly new in Python and I haven't used the regular expressions
 enough to be able to achieve what I want.
 I'd like to select terms in a string, so I can then do a search in my
 database.

 query = '     some words  with and without    quotes     '
 p = re.compile(magic_regular_expression)   $ --- the magic happens
 m = p.match(query)

 I'd like m.groups() to return:
 ('some words', 'with', 'and', 'without quotes')

 Is that achievable with a single regular expression, and if so, what
 would it be?

 Any help would be much appreciated.

 Thanks!!

 Julien

You can't do it simply and completely with regular expressions alone
because of the requirement to strip the quotes and normalize
whitespace, but its not too hard to write a function to do it. Viz:

import re

wordre = re.compile('[^]+|[a-zA-Z]+').findall
def findwords(src):
ret = []
for x in wordre(src):
if x[0] == '':
#strip off the quotes and normalise spaces
ret.append(' '.join(x[1:-1].split()))
else:
ret.append(x)
return ret

query = ' Some words  withand withoutquotes '
print findwords(query)

Running this gives
['Some words', 'with', 'and', 'without quotes']

HTH

Harvey
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Re: Question regarding Queue object

2008-04-29 Thread Terry

On Apr 29, 5:30 pm, Nick Craig-Wood [EMAIL PROTECTED] wrote:
 Terry [EMAIL PROTECTED] wrote:
   On Apr 28, 5:30 pm, Nick Craig-Wood [EMAIL PROTECTED] wrote:
   David [EMAIL PROTECTED] wrote:
 Another idea would be to have multiple queues, one per thread or per
 message type group. The producer thread pushes into the appropriate
 queues (through an intelligent PutMsg function), and the consumer
 threads pull from the queues they're interested in and ignore the
 others.

   Unfortunately a thread can only wait on one Queue at once (without
   polling).  So really the only efficient solution is one Queue per
   thread.

   Make an intelligent PutMsg function which knows which Queue (or
   Queues) each message needs to be put in and all the threads will have
   to do is Queue.get() and be sure they've got a message they can deal
   with.

   I do have one Queue per thread. The problem is the thread can not peek
   into the Queue and select msg with certain ID first.

 My point is don't put messages that the thread doesn't need in the
 queue in the first place.  Ie move that logic into PutMsg.

 --
 Nick Craig-Wood [EMAIL PROTECTED] --http://www.craig-wood.com/nick

Well, I'm simulating the real world. It's like that you wouldn't drop
or proceed a task when you already started your lunch, just save it
and process it later when you finish your lunch.
Of course the task sender can send the task again and again if he got
not ack from you. But that's  just one possible situation in the real
world, and not an efficient one.
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Re: Simple TK Question - refreshing the canvas when not in focus

On Apr 29, 10:36 am, Eric Brunel [EMAIL PROTECTED] wrote:
 On Tue, 29 Apr 2008 15:22:12 +0200, blaine [EMAIL PROTECTED] wrote:
  Hey everyone!
I'm not very good with Tk, and I am using a very simple canvas to
  draw some pictures (this relates to that nokia screen emulator I had a
  post about a few days ago).

  Anyway, all is well, except one thing.  When I am not in the program,
  and the program receives a draw command (from a FIFO pipe), the canvas
  does not refresh until I click into the program. How do I force it to
  refresh, or force the window to gain focus?  It seems like pretty
  common behavior, but a few things that I've tried have not worked.

  Class screen():
  def __init__(self):
  self.root = Tkinter.Tk()
  self.root.title('Nokia Canvas')
  self.canvas = Tkinter.Canvas(self.root, width =130,
  height=130)
  self.canvas.pack()
  self.root.mainloop()

  Then somewhere a long the line I do:
  self.canvas.create_line(args[0], args[1], args[2],
  args[3], fill=color)
  self.canvas.pack()

 Unrelated question: why are you doing a .pack() again here? Packing the
 widget just inserts it at the right place in its container, so you only
 have to do it once. So the one you did in __init__ is enough.

  I've tried self.root.set_focus(), self.root.force_focus(),
  self.canvas.update(), etc. but I can't get it.

 IIRC:
 - self.root.set_focus() will only work if your application already has the
 focus, so it's not what you need here.
 - self.root.force_focus() is usually considered as evil: it'll give the
 focus to your application whatever the user is doing, which is usually
 *really* annoying. So I guess a lot of window managers just refuse to do
 it; this may be what happens here.

 But self.canvas.update() should work. If it doesn't, then there are
 probably limitations on your platform that prevents it to work... Do you
 happen to have other applications that can update their display while they
 don't have the focus? Do they have the same problem? If they do, it's
 probably a limitation on the platform and I guess you won't be able to do
 anything about it... BTW, what platform are you on?

  Thanks!
  Blaine

 HTH
 --
 python -c print ''.join([chr(154 - ord(c)) for c in
 'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])

Thanks a lot for the response! To answer your first question - I'm
using pack() there because I didn't mean to slip it in - this is
something I wrote very quickly and was playing around with... and
pack() should not be there, heh.

I'm just using OS X with Python 2.5.  For the record - I don't mind if
the application forces focus.  The only time I will be running this
emulator is when I'm trying to use it.

I'll try the update() again.  I would want to use that on the canvas
itself right? Not the root window?

Blaine
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Re: Why is None = 0

2008-04-29 Thread Duncan Booth

blaine [EMAIL PROTECTED] wrote:

 On Apr 29, 5:32 am, Duncan Booth [EMAIL PROTECTED] wrote:
 =?ISO-8859-15?Q?=22Martin_v=2E_L=F6wis=22?= [EMAIL PROTECTED]
 wrote: 
  (FWIW, in 2.x, x=4?, it's None  numbers  anything else;
  numbers are ordered by value, everything else is ordered
  by type name, then by address, unless comparison functions
  are implemented).

 Quite apart from Jon pointing out that this isn't true for all cases
 when copmparing against None, the other half also isn't true:

  class C: pass
  C()  5

 True

 That happens at least in Python 2.5.2 on win32. Yet another reason to
 avoid old-style classes.
 
 Sorry - but what are new style classes?
 
New style classes are anything type derived from object. e.g.

   class D(object): pass

or (since list is derived from object):

   class E(list): pass

Old style classes are those which either have old-style base classes or 
no base class at all (and no __metaclass__ either but don't worry about 
that for now) e.g. the class C above.

The problem with old style classes is that various things either work 
subtly differently or don't work at all, but you don't get much warning. 
So basically steer clear of them. An example of something which doesn't 
work with old style classes would be the @property decorator: you can 
get the property, but setting it simply overwrites the property with the 
new value.

See http://www.google.co.uk/search?q=python+%22new+style%22 for more 
information.
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Re: Using Python to verify streaming tv/radio station links

2008-04-29 Thread alexelder

On Apr 29, 1:52 pm, [EMAIL PROTECTED] wrote:
 Hi guys. I've put together a website (http://worldwidemediaproject.com
 ) that is a database of internet streaming tv/radio stations from
 around the world. I have built the site with all users in mind. The
 site should be Linux, Unix, Mac, Win, etc friendly as I do not hide
 the actual stream link or force the user to use an embedded player to
 view/listen to the streams. In fact, you can even download the streams
 you like as a playlist that you can load into your player of choice
 (and even a few PVR software plugins).

 In building the site, I have enabled the user to report stations that
 are nonfunctional. In addition to this, I would like to automate the
 checking of the links in the database as well as any user submitted
 links. What I am wanting to do is to script this with a simple for
 loop which would loop through a file containing the station stream
 link as well as the station id. I'd like to pass each through some
 kind of verification function and if a connection is made then the
 stream is good and move on to the next. If the connection fails then
 the stream is bad, I would like to add the station id to a file
 containing all 'nonfunctional' streams that I can later automate to
 flag the stations.

 Is there an easy way to use python to verify a stream exists? I've
 done a little experimenting with sockets and was able to connect to my
 usenet server and talk to it, but I don't really know what's involved
 with connecting to streaming windows media, real media and winamp
 servers or what to expect as far as connection status messages.   I am
 not unfamiliar with python, but I am far from an expert. If anyone
 could give me a hand with this or give me a push in the right
 direction I would greatly appreciate it!

 Many thanks!

Hey!

With regards checking feeds, look into urllib (maybe) and the httplib
(definitely). They /could/ offer some sort of information regarding
the activity of your feeds. Without knowing anything about the
streaming protocols I wouldn't suggest my methods to necessarily be
the most helpful. You could, at least [maybe], establish whether a
feed is active if it can return a HTTP 200 response. If that's a
sufficient check I would suggest that httplib is the place to start.

Alex.
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Re: So you think PythonCard is old? Here's new wine in an old bottle.

2008-04-29 Thread Panyasan


 Christian,

 It appears you're missing a file.  Where did you placed my program?  I
 see that there are two places being mentioned:

  no resource file for /Users/bibliograph/Programme/PythonCard/tools/
  layoutEditor/multipropertyEditor

 and

  File /Library/Python/2.5/site-packages/PythonCard/tools/
  layoutEditor/layoutEditor.py, line 556, in createDC

I unzipped the folder you uploaded and placed it in the PythonCard/
tools folder. I get the same error if I try to start the default
resourceEditor.py or layoutEditor.py scripts, so it does not seem to
have to do with your modifications.
When I copy multipropertyEditor.rsrc.py files from PythodCard/tools/
resourceEditor/modules folder to PythodCard/tools/resourceEditor/, it
will throw the error about a different file - might this be some kind
of PATH error?

C.
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Re: Given a string - execute a function by the same name

Arnaud,

Just when I thought my solution couldn't get any better :)

Thanks for that great tip and for an excellent demonstration of using a
decorator.

Regards,
Malcolm

snip
You could avoid #5 from the start using a decorator:

functions = {}

def register(func):
functions[func.__name__] = func
return func

@register
def foo(): print Foo!

@register
def bar(): print Bar!


 functions
{'foo': function foo at 0x6f2f0, 'bar': function bar at 0x6f330}
 functions['bar']()
Bar!
/snip
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PyExcerlerator details

2008-04-29 Thread A_H

Hi, I'm using PyExcelerator, and it's great, but I can't figure out a
few things:


(1)  I set the cell style to '0.00%' but the style does not work.

(2)  I want to place a border around the cells( x1, y1, x2, y2 ) but I
can't find any example of doing that.
Well I do see ONE example, but it erases the cells if I do it after,
or when I write to the cells that erases the outline.
Surely I don't have to tediously set each cells border?

Help?
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Re: Zope/DTML Infuriating...

2008-04-29 Thread William Heymann

On Tuesday 29 April 2008, Jens wrote:
 Hello Everyone.


 dtml-let prefix='main'
 ul
 dtml-in expr=_.range(1,10)
   lidtml-var expr=_['prefix'] + _['sequence-item']/li
 /dtml-in
 /ul
 /dtml-let



I think you are going to really regret doing things this way, it is only going 
to make your life much harder regardless of if you are using zpt or dtml by 
doing stuff like this inside the template. The most correct way in zope to do 
this is to use a python script object and have the dtml call that.

For example your python script would have

return ['main%s' % i for i in range(1,10)]

and your dtml would have

ul
dtml-in path.to.you.script()
 lidtml-var sequence-item/li
/ul


This leads to much cleaner and easier to maintain systems.
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Re: File IO Issues, help :(

2008-04-29 Thread Kevin K

On Apr 29, 1:07 am, Kevin K [EMAIL PROTECTED] wrote:
 On Apr 29, 12:55 am, Peter Otten [EMAIL PROTECTED] wrote:



  Kevin K wrote:
   On Apr 29, 12:38 am, Eric Wertman [EMAIL PROTECTED] wrote:
   chuck in a jsfile.close().  The buffer isn't flushing with what you
   are doing now.  jsfile.flush() might work... not sure.  Closing and
   re-opening the file for sure will help though.

   Yeah sorry I forgot to include the close() in the quote but its there.
   In fact I moved it up a bit and still no luck heres the new code:

   jsfile = open(../timeline.js, r+)
   jscontent = jsfile.readlines()
   jsfile.truncate()

   for line in jscontent:
   if re.search('var d =', line):
   line = var d = \+mint['1'].ascdate()+\\n
   print line
   jsfile.write(line)
   jsfile.close()

   I tried this can got the same result...??

  
  truncate(...)
  truncate([size]) - None.  Truncate the file to at most size bytes.

  Size defaults to the current file position, as returned by tell().
  

  After the readlines() call the current file position is at the end of the
  file. Try jsfile.truncate(0).

  Also note that readlines() reads the whole file into memory. For large files
  it would therefore be better to write to a new file and rename it
  afterwards.

  Peter

 Thanks Peter that seemed to be most of the problem, however I now have
 a bunch of null characters in the file. Could it be an unwanted line
 in the list that im writing?

 Thanks,
 Kevin

Awesome that seems to work fine! Thanks a lot for your help guys!
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Re: Zope/DTML Infuriating...

On Apr 29, 3:16 pm, Christian Heimes [EMAIL PROTECTED] wrote:
 Jens schrieb:

  Hello Everyone.

  I am relatively new to Zope(using it for a work project) and I was
  wondering if someone here could help me out or at least refer me to a
  decent documentationg for Zope/DTML/Python (at the detail level of
  php.net or Java API reference).  
  http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/
  isn't really detailed enough for my taste. if it doesn't contain a
  exhautive description of all available base classes it's simply no
  good as a reference resource.

 Are you forced to use DTML for the job? ZPT are far superior and easier
 to work with, if you have to output HTML.

 Christian

For now, I have to use DTML as I am building on an existing solution.
I might look into ZPT's but I have limited time and theres no to time
at this point to redo everything as ZPT. In the long run we're
probably
going in a completely different direction, but that a another story.

I like some aspects of zope but I find that it ends up sitting between
two chairs. On one hand it want's to be a templating language which is
easy to get into for novices, but on the other hand you really have be
familiar with python to be able to so stuff thats only slighty more
complicated
then standard SSI. And don't get me started on the whole security
philosophy.

@Marco:
Thanks for the links :-) Python may be one of those really elegant
languages, but the reference is really sub standard. Checkout the
layout
of php.net for comparison. Think what you will about php, but the
reference
is excellent. For that matter check out msdn section on old-school
asp, or
even the common-lisp documentation(http://www.lispworks.com/
documentation/HyperSpec/Front/Contents.htm)
It's  accessibility like that i'm missing. It shouldn't take 10 min
and a usenet
post to figure to how to basic stuff like string concatenation. And
theres
still plenty of unanswered questions after checking the reference:

- What is the exact definition of the operator e.g. op + (string,
string) - string, op + (int, int) : int, op + (float ...
- What is the exact operator precedence
- Why is it, when primitive data types seem to be objects (similar to
javascript), that type casting is done through build-in functions
rather than methods, e.g. String.toInt('5') or '5'.toInt() or x =
Integer.fromString('5').



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Re: Zope/DTML Infuriating...