Arlington VA Python sprint
A note to Washington DC-area Python people: the Arlington sprint will be held tomorrow, Saturday the 23rd, at the Arlington Career Center. Directions are in the wiki at http://wiki.python.org/moin/ArlingtonSprint. --amk -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
PyCon 2007 submission now open
The web application for submitting proposals to PyCon 2007 is now available at http://us.pycon.org/apps07/proposals/, so you can now send in your talk ideas. The deadline for submitting a proposal is October 31st. For more information, see the Call For Proposals at http://us.pycon.org/TX2007/CallForProposals. We're also accepting proposals for three-hour tutorials for the day before the conference. Tutorial proposals can be submitted through e-mail; please see http://us.pycon.org/TX2007/CallForTutorials for information. Andrew M. Kuchling [EMAIL PROTECTED] Co-chair, PyCon 2007 http://us.pycon.org -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
ANN: DBUtils 0.9.2 has been released
DBUtils 0.9.2 has been released. DBUtils is a suite of tools providing solid, persistent and pooled connections to a database that can be used in all kinds of multi-threaded environments such as Webware for Python or other web application servers. The suite supports DB-API 2 compliant database interfaces and the classic PyGreSQL interface. The new version is available for download at: * http://www.python.org/pypi/DBUtils/ and * http://www.w4py.org/downloads/DBUtils/ Changes: * http://www.w4py.org/DBUtils/Docs/RelNotes-0.9.2.html User's Guide available at: * http://www.w4py.org/DBUtils/Docs/UsersGuide.html -- Christoph Zwerschke -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: Using py2exe to wrap a service?
CONCLUSION: Tim Golden sent me a patched version of his active_directory.py ver 0.4 and that solved my problem! Thanks all for your attention and in particular, Tim! //Maria 111a112 from win32com.client.gencache import EnsureDispatch 180c181 _connection = Dispatch (ADODB.Connection) --- _connection = EnsureDispatch (ADODB.Connection) 216c217 command = Dispatch (ADODB.Command) --- command = EnsureDispatch (ADODB.Command) 419a421 -- http://mail.python.org/mailman/listinfo/python-list
Re: How does IPython modify the sys.path?
Daniel Mark wrote: So how dos IPython modify my sys.path without trace??? sys.path.append() Specifically, line 321 of ipmaker.py -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to save a running program and reload next time ?
Hans Georg Krauthaeuser wrote: [EMAIL PROTECTED] wrote: Can objects be saved and reloaded by Pickle ? I have tried but no success. Yes, that's the intended use of pickle/cPickle. There are examples in the docs: http://docs.python.org/lib/module-pickle.html What have you tried and what didn't work? Hans Georg My program is a genetic algorithm based program, so I thought I just need to save a generation object of the population and reload it later then my program could continue. But after I saved a generation object from within python using cPickle and reload it from another program, it said that some class object couldn't be found. Now I realized that a program cannot be suspended and reloaded by just simply dumping and loading using cPickle/Pickle. I will try stackless python later. Thanks a lot . Regards, xiaojf -- http://mail.python.org/mailman/listinfo/python-list
Re: How does IPython modify the sys.path?
Daniel Mark wrote: However, I cannot figure out how IPython can change my sys.path. I refer to all the following sources 1 http://www.python.org/doc/current/inst/search-path.html Installing Python Modules 2 KEY_LOCAL_MACHINE\Software\Python\PythonCore\2.4\PythonPath 3 My machine has no environment variable PYTHONPATH 4 There is no *.pth file under C:\Program Files\Python24\Lib\site-packages that contains that information (i.e. C:\\Documents and Settings\\Daniel\\_ipython) did you look up sys.path in the documentation ? A list of strings that specifies the search path for modules. Initialized from the environment variable PYTHONPATH, plus an installation-dependent default. /.../ A program is free to modify this list for its own purposes. http://pyref.infogami.com/sys.path /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to save a running program and reload next time ?
[EMAIL PROTECTED] wrote: Hans Georg Krauthaeuser wrote: [EMAIL PROTECTED] wrote: Can objects be saved and reloaded by Pickle ? I have tried but no success. Yes, that's the intended use of pickle/cPickle. There are examples in the docs: http://docs.python.org/lib/module-pickle.html What have you tried and what didn't work? Hans Georg My program is a genetic algorithm based program, so I thought I just need to save a generation object of the population and reload it later then my program could continue. But after I saved a generation object from within python using cPickle and reload it from another program, it said that some class object couldn't be found. Now I realized that a program cannot be suspended and reloaded by just simply dumping and loading using cPickle/Pickle. I will try stackless python later. Thanks a lot . Regards, xiaojf I use pickle to periodically save measured data for measurements that take several days to finish. Actually, I save a class instance with the data, the measurement methods and additional informations what method was called and with what parameters. If the measurement crashes due to some reasons, I recreate the class instance from the pickle file, call the appropriate method with the saved parameters. Then, the method has to look what data is already there and will continue to measure the rest. I have no idea whether that will help you in your situation. Anyway, I wish you all the best. Hans Georg -- http://mail.python.org/mailman/listinfo/python-list
Help with JPEG support with PIL 1.1.5 and OSX
Hi I've spent a good majority of my day trying to figure out how to have PIL 1.1.5 working on my OSX 10.3.9_PPC machine. I'm still stuck and I have not gotten anywhere. Could somebody please help me... I've scoured all the documentation, google, and mailing lists to no avail. I believe the problem may lay in a jpeglib problem with OSX 10.3.9, or a python paths problem. Here is info on my system (note this is not the default Python version that comes with OSX): Python 2.4.1 (#2, Mar 31 2005, 00:05:10) [GCC 3.3 20030304 (Apple Computer, Inc. build 1666)] on darwin This email is really long, I've seperated the sections with 3-4 lines of spacing. Here is my own PIL installation summary, I followed directions in README. I am using the most recent install package from the PIL website. I also tried using the default JPEG_ROOT=None and JPEG_ROOT = sw/lib, where I was able to locate the jpeglib files. --- running install running build running build_py running build_ext PIL 1.1.5 BUILD SUMMARY version 1.1.5 platform darwin 2.4.1 (#2, Mar 31 2005, 00:05:10) [GCC 3.3 20030304 (Apple Computer, Inc. build 1666)] *** TKINTER support not available --- JPEG support ok --- ZLIB (PNG/ZIP) support ok *** FREETYPE2 support not available To add a missing option, make sure you have the required library, and set the corresponding ROOT variable in the setup.py script. To check the build, run the selftest.py script. running build_scripts running install_lib running install_scripts changing mode of /Library/Frameworks/Python.framework/Versions/2.4/bin/pilconvert.py to 755 changing mode of /Library/Frameworks/Python.framework/Versions/2.4/bin/pildriver.py to 755 changing mode of /Library/Frameworks/Python.framework/Versions/2.4/bin/pilfile.py to 755 changing mode of /Library/Frameworks/Python.framework/Versions/2.4/bin/pilfont.py to 755 changing mode of /Library/Frameworks/Python.framework/Versions/2.4/bin/pilprint.py to 755 creating /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packag es/PIL.pth --- This file was 212KB. I tried running the self-test and this is my output: * Failure in example: _info(Image.open(Images/lena.jpg)) from line #24 of selftest.testimage Exception raised: Traceback (most recent call last): File ./doctest.py, line 499, in _run_examples_inner exec compile(source, string, single) in globs File string, line 1, in ? File ./selftest.py, line 21, in _info im.load() File PIL/ImageFile.py, line 180, in load d = Image._getdecoder(self.mode, d, a, self.decoderconfig) File PIL/Image.py, line 328, in _getdecoder raise IOError(decoder %s not available % decoder_name) IOError: decoder jpeg not available 1 items had failures: 1 of 55 in selftest.testimage ***Test Failed*** 1 failures. *** 1 tests of 55 failed. I ran $python -vv -c import _imaging and this was the important output: import _imaging # dynamically loaded from /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/PIL/_imaging.so This file was 962KB. The _imaging.so file mentioned above (962KB) was not actually the same one that I compiled earlier (212KB). So I figured there must be some problem with my python path. I copied the newly compiled version into the python PIL directory above and tried again. Same problem on self test. I then tried the Darwin ports py-pil (http://py-pil.darwinports.com/). This is the output that I got when installing: sudo port install py-pil --- Fetching freetype --- Attempting to fetch freetype-2.1.10.tar.bz2 from http://download.savannah.gnu.org/releases/freetype/ --- Verifying checksum(s) for freetype --- Extracting freetype --- Applying patches to freetype --- Configuring freetype --- Building freetype with target all --- Staging freetype into destroot --- Packaging tgz archive for freetype 2.1.10_1 --- Installing freetype 2.1.10_1 --- Activating freetype 2.1.10_1 --- Cleaning freetype --- Fetching jpeg --- Attempting to fetch jpegsrc.v6b.tar.gz from http://www.ijg.org/files --- Verifying checksum(s) for jpeg --- Extracting jpeg --- Applying patches to jpeg --- Configuring jpeg --- Building jpeg with target all --- Staging jpeg into destroot --- Packaging
Re: How to return an not string' error in function?
I've learned a lot from you two, thank you:) Peace -- http://mail.python.org/mailman/listinfo/python-list
Re: distutils on Windows with VC++ 8
Martin v. Löwis wrote in news:[EMAIL PROTECTED] in comp.lang.python: [EMAIL PROTECTED] schrieb: I'm trying to install two different packages which wrap C or C++ code and which make use of distutils.build_ext, which barfs because my only compiler is too new. Trying this both on Python 2.4.3 and 2.5. Evidently there is a requirement that the compiler used to build the C/C++ in the installation must be the same as was used to build Python? Am I understanding that correctly? Yes. What's the workaround? There are several work-arounds, but they all come down to get a copy of the one of the supported compilers. The options are: - get a copy of VS 2003 on Ebay Download the 1.1 SDK: url:http://www.microsoft.com/downloads/details.aspx?familyid=9B3A2CA6- 3647-4070-9F41-A333C6B9181Ddisplaylang=en yes it does have 90 odd megabytes of stuff you don't want but the C/C++ compiler is in there. - use cygwin/mingw (should work for C, might not work for C++ if you use MFC or some other MS-compiled library) - find the VS 2003 Toolkit; Microsoft took it off the net, but Google may still be able to help I think the VS 2003 toolkit is a framework for extending Visual Studio 2003, IOW a bunch of .NET dlls, some examples and a helpfile (no compiler). Rob. -- http://www.victim-prime.dsl.pipex.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange behaviour of 'is'
Steve Holden [EMAIL PROTECTED] wrote: Absolutely correct. It would be more interesting to discuss how the output from these statements varied between (say) CPython, Jython and Iron Python. At the moment the discussion is indeed about insignificant implementation trivia. CPython seems to collapse identical float values if they are in the same compilation unit: x = 2. y = 2. x is y False x = 2.; y = 2. x is y True y = [2., 2.] y[0] is y[1] True IronPython doesn't collapse them even when they are in expression: IronPython 1.0.60816 on .NET 2.0.50727.42 Copyright (c) Microsoft Corporation. All rights reserved. x = 2. y = 2. x is y False x = 2.; y = 2. x is y False y = [2., 2.] y[0] is y[1] False JPython seems to behave in a similar manner to CPython: Python command console - JPython 2.1 x = 2. y = 2. x is y 0 x = 2.; y = 2. x is y 1 y = [2., 2.] y[0] is y[1] 1 Sorry, I don't have a more recent Jython implementation to hand to complete the comparison. -- http://mail.python.org/mailman/listinfo/python-list
Re: Can I inherit member variables?
Thanks Bruno, That is a more natural way to do it. The code looks a lot cleaner now. Lorcan. -- http://mail.python.org/mailman/listinfo/python-list
Re: new string method in 2.5 (partition)
In message [EMAIL PROTECTED], Gabriel Genellina wrote: ... a python string has both a length *and* a null terminator (for ease of interfacing C routines ... How does that work for strings with embedded nulls? Or are the C routines simply fooled into seeing a truncated part of the string? -- http://mail.python.org/mailman/listinfo/python-list
what is the best practice to separate Pygtk and long running thread code
Hi,
I am using pygtk for the first times.
I am wondering what would be the best pattern to interface pygtk with
a thread.
The thread is collecting informations (over the network for example) or
is doing some long calculations.
I would like also to separate the gui part to the action part so that I
should be easier to maintain.
What should be the best practice in order to achieve this ?
***
What I use now is :
1)
the gui is launching the action evrey 1 sec and is checking for
message using a queue every second also.
gui.py
etc ...
class window1(SimpleGladeApp):
[EMAIL PROTECTED] class window1 }
[EMAIL PROTECTED] init window1.__init__ {
def __init__(self, path='gui.glade',
root='window1',
domain=app_name, kwargs={}):
path = os.path.join(glade_dir, path)
SimpleGladeApp.__init__(self, path, root, domain, **kwargs)
self.q=Queue.Queue()
self.action=act.action(self.q)
gobject.timeout_add (1000,self.action.go) # this is the action
asked
gobject.timeout_add (1000,self.process) # check if a new message is
available in the queue
def process (self):
dir (self.q)
if self.q.empty() == False :
print from main ,self.q.get()
return True
...etc
2)
The action part is making somehow the interface between the running
thread and the gui :
It puts the new information in the queue for the gui to process it
later.
action.py
import os
import gui
import time
import Queue
import Spethread # thread that always run in the background
class Singleton(object):
_instance = None
def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = super(Singleton, cls).__new__(cls, *args,
**kwargs)
return cls._instance
class action(Singleton):
def __init__(self, queue):
self.q=queue
self.thread_seb=Spethread.worker()
self.thread_seb.start()
self.go()
def go(self):
if self.thread_seb:
reponse=self.thread_seb.status()
self.q.put(reponse)
else :
self.q.put(le thread n'existe plus )
return True
def stop(self):
self.thread_seb.die()
3)
The thread part is just a thread that should from time to time
time.Sleep in order for action to query if it has some new messages.
Spethread.py
import threading
import time
class worker(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
self.value=0
self.go_on=1
def run(self):
print self.go_on=,self.go_on
while self.go_on == 1:
self.value=int(time.time())
res=2
for i in range(0, 100):
res=res^i
print res
time.Sleep(0.01)
def status(self):
return self.value
def die(self):
print die request
self.go_on=0
Thanks in advance for sharing this informations.
Sebastien.
PS :
the entire gui.py
[EMAIL PROTECTED] python gui.py {
[EMAIL PROTECTED] header gui.py {
#!/usr/bin/env python
# -*- coding: UTF8 -*-
# Python module gui.py
# Autogenerated from gui.glade
# Generated on Wed Sep 20 22:03:00 2006
# Warning: Do not modify any context comment beginning with # @--
# They are required to keep user's code
# Doing so will make it unable for kefir to help you further manage
your project
[EMAIL PROTECTED] header gui.py }
[EMAIL PROTECTED] app gui {
import os
import gobject
import gtk
import action as act
import Queue
from SimpleGladeApp import SimpleGladeApp, bindtextdomain
app_name = 'gui'
app_version = '0.0.1'
glade_dir = ''
locale_dir = ''
bindtextdomain(app_name, locale_dir)
[EMAIL PROTECTED] app gui }
[EMAIL PROTECTED] window window1 {
[EMAIL PROTECTED] class window1 {
class window1(SimpleGladeApp):
[EMAIL PROTECTED] class window1 }
[EMAIL PROTECTED] init window1.__init__ {
def __init__(self, path='gui.glade',
root='window1',
domain=app_name, kwargs={}):
path = os.path.join(glade_dir, path)
SimpleGladeApp.__init__(self, path, root, domain, **kwargs)
self.q=Queue.Queue()
self.action=act.action(self.q)
gobject.timeout_add (1000,self.action.go)
gobject.timeout_add (1000,self.process)
[EMAIL PROTECTED] init window1.__init__ }
[EMAIL PROTECTED] new window1.new {
def new(self):
print 'A new %s has been created' % self.__class__.__name__
[EMAIL PROTECTED] new window1.new }
[EMAIL PROTECTED] custom window1 {
# Write your own methods here
[EMAIL PROTECTED] custom window1 }
[EMAIL PROTECTED] callback window1.on_button1_clicked
Re: new string method in 2.5 (partition)
Lawrence D'Oliveiro [EMAIL PROTECTED] wrote:
In message [EMAIL PROTECTED], Gabriel
Genellina wrote:
... a python string has both a length *and* a null terminator (for
ease of interfacing C routines ...
How does that work for strings with embedded nulls? Or are the C routines
simply fooled into seeing a truncated part of the string?
If passed to a C library function it would mean that the C code would
generally only use up to the first embedded null. However the Python
standard library will usually check for nulls first so it can throw an
error:
with open('test.txt', 'r') as f:
... print f.read()
...
Hello world
with open('test.txt\x00junk', 'r') as f:
... print f.read()
...
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: file() argument 1 must be (encoded string without NULL
bytes), not str
What actually happens is that Python argument parsing code will reject
values with embedded nulls if asked to convert a parameter to a C string
('s', 'z', 'es', or 'et' formats), but will allow them if converting to a C
string and a length ('s#', 'z#', 'es#', or 'et#').
--
http://mail.python.org/mailman/listinfo/python-list
Re: I need some help with a regexp please
John Machin wrote: ... A little more is unfortunately not enough. The best advice you got was to use an existing e-mail address validator. We got bitten by this at the last place I worked - we were using a regex email validator (from Microsoft IIRC), and we kept having problems with specific email addresses from Ireland. There are stack of Irish email addresses out there of the form paddy.o'[EMAIL PROTECTED] - perfectly valid email address, but doesn't satisfy the usual naive versions of regex validators. We use an even worse validator at my current job, but the feeling the management have (not one I agree with) is that unusual email addresses, whilst perhaps valid, are uncommon enough not to worry about -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and CORBA
On Thu, 21 Sep 2006 15:11:07 +0200, Diez B. Roggisch [EMAIL PROTECTED] wrote: AFAIK Fnorb also had license issues - I'm not entirely sure of that, but better check it. The earlier versions seem to have been somewhat proprietary, but the latest one should be as free as Python is. Extract from the license agreement (just before the legalese starts): The intent of this license is to grant you the same freedoms to use fnOrb that you enjoy under the Python 2.2 License (http://www.python.org/2.2/license.html). So there should be no problem with that (AFAICT, but I'm no lawyer...) HTH -- python -c print ''.join([chr(154 - ord(c)) for c in 'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-']) -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses (was: I need some help with a regexp please)
Ben Finney wrote: ... The best advice I've seen when people ask How do I validate whether an email address is valid? was Try sending mail to it. There are advantages to the regex method. It is faster than sending an email and getting a positive or negative return code. The delay may not be acceptable in many applications. Secondly, the false negatives found by a reasonable regex will be few compared to the number you'd get if the smtp server went down, or a remote relay was having problems delivering the message etc etc. From a business point of view, it is probably more important to reduce the number of false negatives than to reduce the number of false positives - every false negative is a potential loss of a customer. False positives? Who cares really as long as they are paying ;-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses (was: Ineed some help with a regexp please)
bruce wrote:
so ben...
if you were creating a web app with an email form... rather than try to
check if the email is valid...
Ever bothered to read the relevant rfc ?
you'd create something to allow anyone to
potentially spam the hell out of a system...
I'm sorry, but I fail to see how validating (or not) an email address
could prevent using a webmail form for spamming. Care to elaborate ?
my two cents worth... try to verify/validate that the email is valid,
If it doesn't have an @ somewhere in it, it's not a valid mail address.
Else, it may or not be a valid email address - and then the only
reliable way to know is to send a mail to that address.
and
possibly belongs to the user...
How do you intend to check this ?
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses
Ben Finney wrote:
Steve Holden [EMAIL PROTECTED] writes:
Ben Finney wrote:
The best advice I've seen when people ask How do I validate
whether an email address is valid? was Try sending mail to it.
That only applies if it's a likely-looking email address. If someone
asks me to send mail to splurge.!#$%*[EMAIL PROTECTED]{}_) I will
probably assume that it isn't worth my time trying.
You, as a human, can possibly make that decision, if you don't care
about turning away someone who *does* have such an email address. How
can an algorithm do so? There are many valid email addresses that look
as bizarre as the example you gave.
The sending system's mail transport agent, not regular
expressions, determines which part is the domain to send the mail
to.
The domain name system, not regular expressions, determines what
domains are valid, and what host should receive mail for that
domain.
Most especially, the receiving mail system, not regular
expressions, determines what local-parts are valid.
Nevertheless, I am *not* going to try delivery to (for example) a
non-local address that doesn't contain an at@ sign.
Would you try delivery to an email address that contains two or more
@ symbols? If not, you will be denying delivery to valid RFC2821
addresses.
This is, of course, something you're entitled to do. But you've then
consciously chosen not to use is the email address valid? as your
criterion, and the original request for such validation becomes moot.
What proportion of deliverable e-mail addresses have more than one @ in
them?
It may be a good idea, if the supplier of the e-mail address is a human
and is on-line, to run a plausibility check -- does it look like the
vast majority of addresses? Sure,
[EMAIL PROTECTED]@[EMAIL PROTECTED] may be valid and deliverable,
but [EMAIL PROTECTED]@pastetwice.unorg may be valid and
undeliverable. IMHO a quick Please check and confirm dialogue would
be warranted.
Cheers,
John
--
http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses (was:Ineed some help with a regexp please)
Bruno Desthuilliers wrote: if you were creating a web app with an email form... rather than try to check if the email is valid... Ever bothered to read the relevant rfc ? or the perl faq: http://faq.perl.org/perlfaq9.html#How_do_I_check_a_val /F -- http://mail.python.org/mailman/listinfo/python-list
Re: I need some help with a regexp please
Ant wrote: John Machin wrote: ... A little more is unfortunately not enough. The best advice you got was to use an existing e-mail address validator. We got bitten by this at the last place I worked - we were using a regex email validator (from Microsoft IIRC), and we kept having problems with specific email addresses from Ireland. There are stack of Irish email addresses out there of the form paddy.o'[EMAIL PROTECTED] - perfectly valid email address, but doesn't satisfy the usual naive versions of regex validators. We use an even worse validator at my current job, but the feeling the management have (not one I agree with) is that unusual email addresses, whilst perhaps valid, are uncommon enough not to worry about Oh, sorry for the abbreviation. use implies source from believedly reliable s/w source; test; then deploy :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Building things with setup.py
Robert Kern wrote:
James Stroud wrote:
I did build my own python 2.5, yesterday, requiring me to rebuild all
extensions.
Do other extensions build correctly? If so, it's beginning to look like
a problem in numpy.distutils .
It seems that every thing has built without incident (numarray, numeric,
mxtexttools, pil, reportlab, just to name a few), with the exception,
strangely enough, of python2.5 itself. Python required hiding previous
python installations.
Everything I do is compiled by hand as joe-user. I'm in a situation
where I can't do RPM (and I don't have root on my work machine
(theoretically ;-)) so, to be a good joe-user, everything I add goes
into the prefix:
$HOME/Programs
This is the listing from $HOME/Programs/lib/python2.5/config:
euler 6% ls
total 4092
8 config.c 12 install-sh* 44 Makefile 8 python.o
8 Setup.config
8 config.c.in 3960 libpython2.5.a12 makesetup*24 Setup
8 Setup.local
The build process, by the way, required my copying libpython2.5.a to
$HOME/Programs/lib.
Hmm. That doesn't quite sound right, but it's been a while since I
compiled the interpreter from source.
Sorry. To clarify, making libpython2.5a available in a $LD_LIBRARY_PATH
was necessary to build numpy and scipy.
The text files Setup.config and Setup.local do not seem to have
terribly specific information in them. Which file in particular should
I inspect?
Makefile has most of that information. You can verify that distutils is
finding it like so:
from distutils import sysconfig
sysconfig.get_makefile_filename()
'/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/config/Makefile'
d = sysconfig.parse_makefile(_)
import pprint
pprint.pprint(d)
{'AR': 'ar',
...
}
This output from the check is here:
http://www.jamesstroud.com/build-scipy-logs/distutil-check.txt
I'm not sure if this is relevant to what you see in the check, but I
installed scipy_distutils AFTER installing scipy.
I did not capture output from the build and I could not find a file
with the word log in it that appears to be a build log. The jist of
the problem is that first it can't find symbols from libpython2.5,
then from libthread, etc. Then, it complains about no MAIN__ when
linking the .so files with g77 and no main with gcc (which is
curious), so I must include the -shared flag, after including
-llibrary type flags for all of the libraries it doesn't know about.
What versions of gcc and g77 are you using?
euler 2% g77 -v
Reading specs from
/auto_nfs/data10/users/jstroud/Programs/bin/../lib/gcc/i686-pc-linux-gnu/3.4.2/specs
Configured with: ./configure --prefix=/data1/users/jstroud/Programs :
(reconfigured) ./configure --prefix=/data1/users/jstroud/Programs
Thread model: posix
gcc version 3.4.2
euler 3% gcc -v
Reading specs from
/auto_nfs/data10/users/jstroud/Programs/bin/../lib/gcc/i686-pc-linux-gnu/3.4.2/specs
Configured with: ./configure --prefix=/data1/users/jstroud/Programs :
(reconfigured) ./configure --prefix=/data1/users/jstroud/Programs
Thread model: posix
gcc version 3.4.2
If its necessary, I can run setup.py build again and send the output
to a file and post that to scipy-dev if you think it might be helpful.
Yes, that is what I intended.
This is posted here:
http://www.jamesstroud.com/build-scipy-logs/build-scipy-py2.5-euler.txt
For symmetry, similar output for numpy is posted here:
http://www.jamesstroud.com/build-scipy-logs/build-numpy-py2.5-euler.txt
Please let me know if I can be of any further help with these issues.
James
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Re: Building things with setup.py
Martin v. Löwis wrote: James Stroud schrieb: This is annoying. I am trying to build scipy right now but every .so file requires my adding -lpython2.5 -lpthread -lm -lutil -ldl -shared to the ld flags. That shouldn't be necessary. Linking without this should work just fine. Unfortunately, this was not my experience. That way, since you made libpython2.5.a a static library, you link an entire Python interpreter into each and every extension module. This should not be done. Actually, a straight configure, make, install of the python2.5 source produced this library. What happens if you omit these flags? Please see my last message to Robert Kern. James -- http://mail.python.org/mailman/listinfo/python-list
Re: Can I inherit member variables?
Gabriel Genellina wrote:
At Thursday 21/9/2006 09:14, Bruno Desthuilliers wrote:
When you construct an object instance, it is of a certain type from
that
precise moment, and you can't change that afterwards.
Err... Actually, in Python, you can. It's even a no-brainer.
Yes, but trying to explain that to a beginner would just make things
worse...
Agreed. But this newsgroup is not only read by beginners, and the last
part of your statement happens to be false. The first part is ok, and
would have been enough IMHO.
You must grab the inheritance concept first.
Mmm... It's clear that the OP didn't get the concept right...
OTHO, inheritance (not subtyping...) is a very overrated concept IMHO
and really not central to OO - at least with dynamically typed languages
(or using type inference). It's in fact nothing more than a special case
of composition/delegation. What's really important here is polymorphic
dispatch, which shouldn't (and, in Python, doesn't) rely on
implementation inheritance.
I really think that insisting on implementation inheritance is the wrong
way to teach OO. But I may not be a good teacher !-)
--
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: Tkinter button not working as expected
[EMAIL PROTECTED] wrote: I've created a short test program that uses tkFileDialog.askdirectory to help the user input a path into a tk entry widget. The problem I'm having is that when I run the code as listed below, the getPath function is called when the program initially runs, not when the button is pressed. the right side of an assignment is always evaluated before it is assigned, so self.button[command] = self.getPath(t) will call self.getPath(t) and then assign the return value to button[command]. quite obvious, if you think about it, right ? the easiest way to fix this is to add a local function that calls getPath, and use that as the button callback: def callback(): self.getPath(t) self.button[command] = callback (if you want, you can inline the getPath code in the callback). /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to save a running program and reload next time ?
Hans Georg Krauthaeuser wrote: [EMAIL PROTECTED] wrote: Hans Georg Krauthaeuser wrote: [EMAIL PROTECTED] wrote: Can objects be saved and reloaded by Pickle ? I have tried but no success. Yes, that's the intended use of pickle/cPickle. There are examples in the docs: http://docs.python.org/lib/module-pickle.html What have you tried and what didn't work? Hans Georg My program is a genetic algorithm based program, so I thought I just need to save a generation object of the population and reload it later then my program could continue. But after I saved a generation object from within python using cPickle and reload it from another program, it said that some class object couldn't be found. Now I realized that a program cannot be suspended and reloaded by just simply dumping and loading using cPickle/Pickle. I will try stackless python later. Thanks a lot . Regards, xiaojf I use pickle to periodically save measured data for measurements that take several days to finish. Actually, I save a class instance with the data, the measurement methods and additional informations what method was called and with what parameters. If the measurement crashes due to some reasons, I recreate the class instance from the pickle file, call the appropriate method with the saved parameters. Then, the method has to look what data is already there and will continue to measure the rest. I have no idea whether that will help you in your situation. Anyway, I wish you all the best. Hans Georg I just realized another serious problem. Random values are extensively used in my program, so the program may probably not continue to run from an absolutely identical state where it stopped. Can the state of the random value generator be saved ? Regards, xiaojf -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses
John Machin [EMAIL PROTECTED] writes: What proportion of deliverable e-mail addresses have more than one @ in them? I don't know. Fortunately, I don't need to; I don't validate email addresses by regular expression. What proportion of deliverable email addresses do you want to discard as not valid? -- \ Theology is the effort to explain the unknowable in terms of | `\ the not worth knowing. -- Henry L. Mencken | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Building things with setup.py
Robert Kern wrote: James Stroud wrote: I did build my own python 2.5, yesterday, requiring me to rebuild all extensions. Do other extensions build correctly? If so, it's beginning to look like a problem in numpy.distutils . Actually, I just found that MySQLdb had a similar problem with zlib, but instead of bonking during linking, it complained about the compress symbol when trying to import into python. The fix was adding -lz for the linking step, after which it imported just fine. James -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses
Ben Finney wrote: John Machin [EMAIL PROTECTED] writes: What proportion of deliverable e-mail addresses have more than one @ in them? I don't know. Fortunately, I don't need to; I don't validate email addresses by regular expression. What proportion of deliverable email addresses do you want to discard as not valid? None. Re-read my post. I was suggesting suggesting an are you sure in the case of weird or infrequent ones. Discarding wasn't mentioned. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is it possible to save a running program and reload next time ?
[EMAIL PROTECTED] wrote: Can the state of the random value generator be saved ? Yes. You can pickle random._inst or your own random.Random instance. Peter -- http://mail.python.org/mailman/listinfo/python-list
CONSTRUCT - New/Old Style Classes, build-in/extension types
Another topic [1] has raised the need of a deeper teach-in. Where can I find _compact_ documentation about * Differece between New Style / Old Style Classes Are there any documents available (again: compact ones) which describe unification attemps subjecting * New Style Classes * Old Style Classes * Build In Types * Extension Types (note: I am aware about search engines. I ask for documentation which other developers have found useful) . [1] CONSTRUCT - Adding Functionality to the Overall System http://groups.google.com/group/comp.lang.python/browse_thread/thread/4618ccef252c82cd -- http://lazaridis.com -- http://mail.python.org/mailman/listinfo/python-list
Re: byte count unicode string
willie [EMAIL PROTECTED] writes:
ustr = buf.decode('UTF-8')
type(ustr)
type 'unicode'
Is it a unicode object that contains a UTF-8 encoded
string object?
No, it's just unicode, which is a string over a certain character set.
UTF-8 is a way to encode unicode strings as byte strings.
You should read the wikipedia article about unicode, it will help you
understand.
http://en.wikipedia.org/wiki/Unicode
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Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Ilias Lazaridis wrote: note: I am aware about search engines. but you're incapable of using them, or ? I ask for documentation which other developers have found useful most recent Python books contains good discussions of the things you're asking for. maybe you should buy a book ? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Ilias Lazaridis [EMAIL PROTECTED] writes: Where can I find _compact_ documentation about Can you tell us what is lacking about the documentation at URL:http://www.python.org/doc/ ? Specifically, what problems have you found in understanding these topics from the documentation available at that site? -- \The World is not dangerous because of those who do harm but | `\ because of those who look at it without doing anything. -- | _o__) Albert Einstein | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: distutils on Windows with VC++ 8
I use the Visual C++ Toolkit 2003 to compile Python extension for Python 2.4. Once installed, it works well. With and without distutils. I also have a installation of Visual Studio 2005 on the same machine. See: http://www.vrplumber.com/programming/mstoolkit/ for more information. There are a lot of tools 'missing' in VTK 2003 for example nmake or cvtres. If you need them, you can copy them from your VS 2005 installation. BTW VTK 2003 does not come with debugging versions of the runtime libs. That means you can not build debug releases this way. HTH, Noel -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses (was: Ineed some help with a regexp please)
you'd create something to allow anyone to potentially spam the hell out of a system... I'm sorry, but I fail to see how validating (or not) an email address could prevent using a webmail form for spamming. Care to elaborate ? The best way would be to implement some limiting features. Try two times from the same IP address in less than 10 minutes and you are banned for the day. Or some such. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re[2]: unicode mystery/problem
John, thanks for your extensive answer. Hi, I am using Python 2.4.3 on Fedora Core4 and Eric3 Python IDE . Below mentioned code works fine in the Eric3 environment. While trying to start it from the command line, it returns: Traceback (most recent call last): File pokus_1.py, line 5, in ? print str(a) UnicodeEncodeError: 'ascii' codec can't encode character u'\xc1' in position 6: ordinal not in range(128) JM So print a works, but print str(a) crashes. JM Instead, insert this: JMimport sys JMprint default, sys.getdefaultencoding() JMprint stdout, sys.stdout.encoding JM and run your script at the command line. It should print: JM default ascii JM stdout x in the command line it prints: * default ascii stdout UTF-8 JM here, and crash at the later use of str(a). JM Step 2: run your script under Eric3. It will print: JM default y JM stdout z in the Eric3 it prints: if the # -*- Eencoding: utf_8 -*- is set than: default utf_8 stdout unhandled AttributeError, AsyncFile instance has no attribute 'encoding' if the encoding is not set than it prints: DeprecationWarning: Non-ASCII character '\xc3' in file /root/eric/analyza_dat_TPC/pokus_1.py on line 26, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details execfile(sys.argv[0], self.debugMod.__dict__) default latin-1 stdout unhandled AttributeError, AsyncFile instance has no attribute 'encoding' JM and then should work properly. It is probable that x == y == z == JM 'utf-8' JM Step 3: see below. == 8 = #!/usr/bin python # -*- Encoding: utf_8 -*- JM There is no UTF8-encoded text in this short test script. Is the above JM encoding comment merely a carry-over from your real script, or do you JM believe it is necessary or useful in this test script? Generally, I am working with string like u'DISKOV\xc1 POLE' (I am getting it from the database) My intention to use # -*- Encoding: utf_8 -*- was to suppress DeprecationWarnings if I use utf_8 in the code (like u'DISKOV\xc1 POLE') a= u'DISKOV\xc1 POLE' print a print str(a) == 8 = Even it looks strange, I have to use str(a) syntax even I know the a variable is a string. JM Some concepts you need to understand: JM (a) a is not a string, it is a reference to a string. JM (b) It is a reference to a unicode object (an implementation of a JM conceptual Unicode string) ... JM (c) which must be distinguished from a str object, which represents a JM conceptual string of bytes. JM (d) str(a) is trying to produce a str object from a unicode object. Not JM being told what encoding to use, it uses the default encoding JM (typically ascii) and naturally this will crash if there are non-ascii JM characters in the unicode object. I am trying to use ChartDirector for Python (charts for Python) and the method layer.addDataSet() needs above mentioned syntax otherwise it returns an Error. JM Care to tell us which error??? you can see the Error description and author comments here: http://tinyurl.com/ezohe layer.addDataSet(data, colour, str(dataName)) I have try to experiment with the code a bit. the simplest code where I can demonstrate my problems: #!/usr/bin python import sys print default, sys.getdefaultencoding() print stdout, sys.stdout.encoding a=['P\xc5\x99\xc3\xad','Petr Jake\xc5\xa1'] b=my nice try %s % ''.join(a).encode(utf-8) print b When I run it from the command line i am getting: sys:1: DeprecationWarning: Non-ASCII character '\xc3' in file pokus_1.py on line 26, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details default ascii stdout UTF-8 Traceback (most recent call last): File pokus_1.py, line 8, in ? b=my nice try %s % ''.join(a).encode(utf-8) UnicodeDecodeError: 'ascii' codec can't decode byte 0xc5 in position 1: ordinal not in range(128) JM The method presumably expects a str object (8-bit string). What does JM its documentation say? Again, what error message do you get if you feed JM it a unicode object with non-ascii characters? JM [Step 3] For foo in set(['x', 'y', 'z']): JM Change str(dataName) to dataName.encode(foo). Change any debugging JM display to use repr(a) instead of str(a). Test it with both Eric3 and JM the command line. JM [Aside: it's entirely possible that your problem will go away if you JM remove the letter u from the line a= u'DISKOV\xc1 POLE' -- however if JM you want to understand what is happening generally, I suggest you don't JM do that] JM HTH, JM John -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses
Ben Finney wrote: John Machin [EMAIL PROTECTED] writes: What proportion of deliverable e-mail addresses have more than one @ in them? I don't know. Fortunately, I don't need to; I don't validate email addresses by regular expression. What proportion of deliverable email addresses do you want to discard as not valid? Just as a matter of interest, are you expecting that you'll find out about the undeliverable ones? Because in many cases nowadays you wont, since so many domains are filtering out undeliverable mail messages as an anti-spam defence. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange behaviour of 'is'
Duncan Booth wrote: Steve Holden [EMAIL PROTECTED] wrote: Absolutely correct. It would be more interesting to discuss how the output from these statements varied between (say) CPython, Jython and Iron Python. At the moment the discussion is indeed about insignificant implementation trivia. CPython seems to collapse identical float values if they are in the same compilation unit: x = 2. y = 2. x is y False x = 2.; y = 2. x is y True y = [2., 2.] y[0] is y[1] True IronPython doesn't collapse them even when they are in expression: IronPython 1.0.60816 on .NET 2.0.50727.42 Copyright (c) Microsoft Corporation. All rights reserved. x = 2. y = 2. x is y False x = 2.; y = 2. x is y False y = [2., 2.] y[0] is y[1] False JPython seems to behave in a similar manner to CPython: Python command console - JPython 2.1 x = 2. y = 2. x is y 0 x = 2.; y = 2. x is y 1 y = [2., 2.] y[0] is y[1] 1 Sorry, I don't have a more recent Jython implementation to hand to complete the comparison. Perfectly all right: you make the point very well that the behavior is an implementation artifact and not a language feature. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: I need some help with a regexp please
John Machin wrote: Ant wrote: John Machin wrote: ... A little more is unfortunately not enough. The best advice you got was to use an existing e-mail address validator. We got bitten by this at the last place I worked - we were using a regex email validator (from Microsoft IIRC) ... Oh, sorry for the abbreviation. use implies source from believedly reliable s/w source; test; then deploy :-) I actually meant that we got bitten by using a regex validator, not by using an existing one. Though we did get bitten by an existing one, and it being from Microsoft we should have known better ;-) -- http://mail.python.org/mailman/listinfo/python-list
Re: send with timeout socket
Stéphane Ninin wrote: Hello, I have a few questions regarding sockets with timeouts. Assuming you set a timeout t on a socket s and then call: 1) s.sendall Is the socket.timeout exception thrown when not the data was sent in the given time t or if nothing was sent ? 2) Similar question for s.send: Is the socket.timeout exception thrown when nothing was sent or ... ? What I am actually trying to do is this: I have a thread which uses a socket to communicate with a socket server, the socket sends data to the server, but it shouldnot block on the send, so I want to do something like this: def sendall(self,data): while data: n = self.send(data) data = data[n:] try: self.request.send(data) except socket.timeout, e: if self.isTerminated(): return but I am not sure this would work the way I want. It wouldn't even compile, as your indentation is shot. Plus, if the first send attempt (the one before the try) sends all the data you then try to send an empty string, which seems a little weird: I don't see the point of the try/except. (self.isTerminated just checks is some event has been set by another thread) Thanks for comments/suggestions/answers, Sending sockets will usually only block when the sliding window is full (the sender has sent as much data as the remote receiver has indicated it can safely receive without loss) and no acknowledgment has been received from the remote receiver. Rather than a timeout it would seem sensible, if you don't want the sending socket to block, to use a non-blocking socket. That way you get a socket.error if a send would otherwise block. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
noob question
where is a good open-source project website? thank-you (sorry for being so annoying)(if I'm annoying)(if not then I'm not sorry) -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing Video conference software for Windows
Thnx everybody for the precious help :) Someone said about VNC... I'll take a look, but since it is an exercise I need to do it, I can't just say someone else arelady did that :) Everything seems quite useful. I forgot two specifications: 1. Screen should be split in small squares and only the changing squares must be transmitted (Ok it shouldn't be too difficult) 2. The comunication must be in multicast I will spend some time testing the resources. PAolo -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the best practice to separate Pygtk and long running thread code
seb wrote: Hi, I am using pygtk for the first times. I am wondering what would be the best pattern to interface pygtk with a thread. The thread is collecting informations (over the network for example) or is doing some long calculations. Hi, I would use several *processes*. If your scripts runs on Unix/Linux you can use select() on the filedescriptors of the processes you created with popen. On Windows you need to poll them, but maybe this is better than threads, too. With idle_add you can get data from the subproceses. It gets called if there are no actions in the event-loop. HTH, Thomas -- Thomas Güttler, http://www.thomas-guettler.de/ http://www.tbz-pariv.de/ E-Mail: guettli (*) thomas-guettler + de Spam Catcher: [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Secure MultiRobot Management
Hi, I am currently doing my final year project Secure mobile Robot Management . I have done the theoretical aspects of it till now and now thinking of coding it . I would like to code in Python , but i am new to Python Network Programming . Some of features of my project are: 1. Each robot can send data to any other robot. 2. Each robot can receive data from any other robot. 3. Every Robot has atleast 1 other bot in its communication range. 4. maximum size of a data packet is limited to 35 bytes 5. each mobile robot maintains a table with routes 6. all the routes stored in the routing table include a ï¬eld named life-time. 7. Route Discovery Process initiated if there is no known route to other bot. 8. There is no server over here . 9. every bot should be able to process the data from other bots and both multicast/unicast need to be supported. Assume the environment is gridded mesh and bots exploring the area. They need to perform a set of tasks (assume finding some locations which are dangerous or smthing like that). My main concern is how to go about modifying the headers such that everything fits in 35bytes . I would like to know how to proceed and if any links or resources in this regard. How to modify the headers ? ie. all in 35 bytes . Thank You, Raja. -- http://mail.python.org/mailman/listinfo/python-list
Python Network Programming
Hi, I am currently doing my final year project Secure mobile Robot Management . I have done the theoretical aspects of it till now and now thinking of coding it .I would like to code in Python , but i am new to Python Network Programming . Some of features of my project are: 1. Each robot can send data to any other robot.2. Each robot can receive data from any other robot.3. Every Robot has atleast 1 other bot in its communication range. 4. maximum size of a data packet is limited to 35 bytes5. each mobile robot maintains a table with routes6. all the routes stored in the routing table include a ï¬eld named life-time.7. Route Discovery Process initiated if there is no known route to other bot. 8. There is no server over here . 9. every bot should be able to process the data from other bots and both multicast/unicast need to be supported.Assume the environment is gridded mesh and bots exploring the area. They need to perform a set of tasks (assume finding some locations which are dangerous or smthing like that). My main concern is how to go about modifying the headers such that everything fits in 35bytes . I would like to know how to proceed and if any links or resources in this regard. How to modify the headers ? ie. all in 35 bytes . Thank You, Raja. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Threading
Calvin Spealman wrote: I repeat this all the time, but the best advice I can give you about using threads is to not use threads at all. Might as well get with the times and ignore that advice. I would point you to good references like Threads Considered Harmful (http://www.kuro5hin.org/story/2002/11/18/22112/860) Note that it's poster boy for multiple processes now uses multiple threads. and The Problem with Threads (http://www.eecs.berkeley.edu/Pubs/TechRpts/2006/EECS-2006-1.html - With Link to PDF). The author's alternatives to threads are not available in Python. Many Pythoners do similar things with threads, such as use the message-passing style via the queue module. It might seem an inappropriate response to your question to simply tell you that you should not do what you are asking how to do, but its just the case that most often anyone without exposure to threads has little or no understanding on just how bad they are for many of the tasks they will be used for. Threads are difficult to control, impossible to predict, and simply one of the most over used, least understood causes of buggy, unmaintainable software in the whole spectrum of development techniques. Threads require some study and understanding, but they work great once one learns to use them. As alternatives, look into what tasks can spawn into other processes, Unfortunately one cannot share Python objects between processes. POSH may change that, but it looks to be stuck in alpha. asyncronous programming (a'la Twisted - http://www.twistedmatrix.com/), I find asynchronous programming much harder to manage than threads, except for fairly simple applications where neither one is hard. and co-routine and similar facilities, such as the tasklets of Stackless and two-way generators now included with Python. Those fail at simple things such as having two of them each waiting at a blocking call. -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
bulding python containing static extension
Hi, I want to build python on a plattform without dynamic linking containing a third party extension, is this possible? Bulding python itself is no problem, with the proper Modules/Setup configuration. But does anybody know how to integrate e.g. numpy as well? Is it possible? Any pointers/hints? Thanks Holger -- http://mail.python.org/mailman/listinfo/python-list
Re: Re[2]: unicode mystery/problem
In [EMAIL PROTECTED], Petr Jakeš
wrote:
I have try to experiment with the code a bit.
the simplest code where I can demonstrate my problems:
#!/usr/bin python
import sys
print default, sys.getdefaultencoding()
print stdout, sys.stdout.encoding
a=['P\xc5\x99\xc3\xad','Petr Jake\xc5\xa1']
b=my nice try %s % ''.join(a).encode(utf-8)
You have two byte strings in the list `a` and try to *encode* them as
utf-8. That does not work. You can make the example even a bit simpler::
'P\xc5\x99\xc3\xadPetr Jake\xc5\xa1'.encode('utf-8')
You cant't *encode* byte strings, just *decode* them. What happens is
that Python tries to make a unicode string from the byte string to encode
that in utf-8. But it decodes as ASCII as that is the default.
Don't mix byte strings and unicode strings. Put an encoding declaration
at the top of your file and convert everything to unicode on the way in
and to the proper encoding on the way out of your program.
Ciao,
Marc 'BlackJack' Rintsch
--
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Re: noob question
xandeer wrote: where is a good open-source project website? thank-you (sorry for being so annoying)(if I'm annoying)(if not then I'm not sorry) sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
Directory this source file is in (and a sibling)
I have a module which needs to know what directory it's in, and to refer to files in a sibling directory, something like App/src/foo.py wants to read App/data/conf.xml . But I have no idea in what context foo.py is going to be run -- it could be being run as a script, it could be being imported as a module by another script from anywhere in the directory structure, it's even possible someone will have called execfile on it. The following works for everything I've tried: thisdir = os.path.dirname(os.path.normpath(__file__)) siblingdir = os.path.normpath(os.path.join(testdir, os.path.pardir, sibling)) However, a colleague expressed disgust at this code, but not really being a Python programmer had no better suggestions. Is there a neater way of getting what I want? -- \S -- [EMAIL PROTECTED] -- http://www.chaos.org.uk/~sion/ ___ | Frankly I have no feelings towards penguins one way or the other \X/ |-- Arthur C. Clarke her nu becomeþ se bera eadward ofdun hlæddre heafdes bæce bump bump bump -- http://mail.python.org/mailman/listinfo/python-list
Isn't bool __invert__ behaviour strange?
Why subclassing bool from int either __invert__ or __neg__ haven't been overrided to produce a boolean negation? I suspect backwards compatibility or something alike, but I still wonder.. And since bool can't be subclassed, to have a type like bool but with boolean negation what do you suggest? A wrapper maybe? (I would use it so I can evaluate user-defined boolean expression creating istances of his/her variables in my namespace and than eval() his/her expression) -- http://mail.python.org/mailman/listinfo/python-list
Re: Re[2]: unicode mystery/problem
Petr Jake wrote:
John, thanks for your extensive answer.
Hi,
I am using Python 2.4.3 on Fedora Core4 and Eric3 Python IDE
.
Below mentioned code works fine in the Eric3 environment. While trying
to start it from the command line, it returns:
Traceback (most recent call last):
File pokus_1.py, line 5, in ?
print str(a)
UnicodeEncodeError: 'ascii' codec can't encode character u'\xc1' in
position 6: ordinal not in range(128)
JM So print a works, but print str(a) crashes.
JM Instead, insert this:
JMimport sys
JMprint default, sys.getdefaultencoding()
JMprint stdout, sys.stdout.encoding
JM and run your script at the command line. It should print:
JM default ascii
JM stdout x
in the command line it prints: *
default ascii
stdout UTF-8
JM here, and crash at the later use of str(a).
JM Step 2: run your script under Eric3. It will print:
JM default y
JM stdout z
in the Eric3 it prints:
if the # -*- Eencoding: utf_8 -*- is set than:
default utf_8
stdout
unhandled AttributeError, AsyncFile instance has no attribute
'encoding'
if the encoding is not set than it prints:
DeprecationWarning: Non-ASCII character '\xc3' in file
/root/eric/analyza_dat_TPC/pokus_1.py on line 26, but no encoding
declared; see http://www.python.org/peps/pep-0263.html for details
execfile(sys.argv[0], self.debugMod.__dict__)
default latin-1
stdout
unhandled AttributeError, AsyncFile instance has no attribute
'encoding'
JM and then should work properly. It is probable that x == y == z ==
JM 'utf-8'
JM Step 3: see below.
== 8 =
#!/usr/bin python
# -*- Encoding: utf_8 -*-
JM There is no UTF8-encoded text in this short test script. Is the above
JM encoding comment merely a carry-over from your real script, or do you
JM believe it is necessary or useful in this test script?
Generally, I am working with string like u'DISKOV\xc1 POLE' (I am
getting it from the database)
My intention to use # -*- Encoding: utf_8 -*- was to suppress
DeprecationWarnings if I use utf_8 in the code (like u'DISKOV\xc1 POLE')
a= u'DISKOV\xc1 POLE'
print a
print str(a)
== 8 =
Even it looks strange, I have to use str(a) syntax even I know the a
variable is a string.
JM Some concepts you need to understand:
JM (a) a is not a string, it is a reference to a string.
JM (b) It is a reference to a unicode object (an implementation of a
JM conceptual Unicode string) ...
JM (c) which must be distinguished from a str object, which represents a
JM conceptual string of bytes.
JM (d) str(a) is trying to produce a str object from a unicode object. Not
JM being told what encoding to use, it uses the default encoding
JM (typically ascii) and naturally this will crash if there are non-ascii
JM characters in the unicode object.
I am trying to use ChartDirector for Python (charts for Python) and the
method layer.addDataSet() needs above mentioned syntax otherwise it
returns an Error.
JM Care to tell us which error???
you can see the Error description and author comments here:
http://tinyurl.com/ezohe
You have two different episodes on that website; adding the one we have
been discussing gives *three* different stories:
Episode 1:
The error description: TypeError: Error converting argument 1 to type
PCc -- you should ask him What is type PCc??? If arg 1 is an
arbitrary str object, which byte values could it possibly be objecting
to?
The author comments: The error code usually means the filename is not
a text string, ... (1) Input file or output file? Is it possible that
one or more bytes are not allowable in a filename? (2) Is it possible
for you to give him the exact args that you are passing in (use print
repr(arg) before the call), and for him to tell you the *exact* reason,
not the usual reason?
Episode 2: Evidently arg is a str object, but passing in str(arg) and
just plain arg give different results??? I doubt it. print repr(arg)
and type(arg) and see what you've actually got there.
layer.addDataSet(data, colour, str(dataName))
I have try to experiment with the code a bit.
the simplest code where I can demonstrate my problems:
#!/usr/bin python
import sys
print default, sys.getdefaultencoding()
print stdout, sys.stdout.encoding
a=['P\xc5\x99\xc3\xad','Petr Jake\xc5\xa1']
b=my nice try %s % ''.join(a).encode(utf-8)
So ''.join(a) is a str object, encoded in utf-8 *already*.
Please try to understand:
(1) unicode_object.encode('utf-8') produces a str_object # in utf-8
encoding
(2) str_object.decode('utf-8') produces a unicode object # if
str_object contains valid utf-8.
(3) str_object.encode('anything') is a nonsense; it is the equivalent
of str_object.decode('ascii').encode('anything') and will typically
fail, as your next error message shows.
What were you trying to do?? I don't understand the relationship
between this little exercise and Episodes
anybody using python 2.5 that raises error while importing?
there's a dll extension used to be imported with no error under version 2.4.3, but the new python complains that the name of the module can't be found. seems not mentioned in the official documentation, any work around to fix the issue without switching back to the old version? tks.. daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: Directory this source file is in (and a sibling)
Sion Arrowsmith wrote: I have a module which needs to know what directory it's in, and to refer to files in a sibling directory, something like App/src/foo.py wants to read App/data/conf.xml . But I have no idea in what context foo.py is going to be run -- it could be being run as a script, it could be being imported as a module by another script from anywhere in the directory structure, it's even possible someone will have called execfile on it. The following works for everything I've tried: thisdir = os.path.dirname(os.path.normpath(__file__)) siblingdir = os.path.normpath(os.path.join(testdir, os.path.pardir, sibling)) However, a colleague expressed disgust at this code, but not really being a Python programmer had no better suggestions. Is there a neater way of getting what I want? If you plan to have your code executed out of a zip or an egg, you may have problems because __file__ is not what you want, at least with eggs and Python 2.[34]. There was a brief thread on this topic on the distutils SIG mailing list within the last few days. HTH, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing Video conference software for Windows
2006/9/22, Paolo Pantaleo [EMAIL PROTECTED]: Thnx everybody for the precious help :) Someone said about VNC... I'll take a look, but since it is an exercise I need to do it, I can't just say someone else arelady did that :) Everything seems quite useful. I forgot two specifications: 1. Screen should be split in small squares and only the changing squares must be transmitted (Ok it shouldn't be too difficult) 2. The comunication must be in multicast Twisted supports multicast ( example http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/425975) I will spend some time testing the resources. PAolo -- if you have a minute to spend please visit my photogrphy site: http://mypic.co.nr -- http://mail.python.org/mailman/listinfo/python-list
Re: anybody using python 2.5 that raises error while importing?
daniel wrote: there's a dll extension used to be imported with no error under version 2.4.3, but the new python complains that the name of the module can't be found. seems not mentioned in the official documentation, any work around to fix the issue without switching back to the old version? Did/does its name end in .dll or in .pyd? Have you procured a new one (necessary when there's a change of minor version number) and installed it in the right place? Can you tell us the name of the module, and the path to the DLL/PYD that is/was imported by Python 2.4? Have you contacted the author(s) of the module? Have you installed Python 2.5 in its own directory e.g. c:\python25 (the default)? Python 2.4, same question? Have you uninstalled 2.4? Regards, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to validate email addresses
Just as a matter of interest, are you expecting that you'll find out about the undeliverable ones? Because in many cases nowadays you wont, since so many domains are filtering out undeliverable mail messages as an anti-spam defence. ...and then there is the problem of validating that the valid email address belongs to the person entering it !! If it doesn't, any correspondence you send to that email address will itself be spam (in the greater modern definition of spam). You could allow your form to accept any email address, then send a verification in an email to the address given, asking the recipient to click a link if they did in fact fill in the form. When they click the link the details from the original form are then verified and can be activated and processed. HTH :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.5 WinXP AMD64
Bjoern Schliessmann wrote: Christophe wrote: To be exact, you need a 64bit Windows OS on a 64bit cpu. Is there a reason that can be explained in a less-than-2-KB posting? :) I mean why Python depends on the processor type that much. The 64-bit version of Python is compiled for 64-bit processors. 32-bit processors don't work the same and won't run the code. The O.P. has a 64-bit Athlon processor, but is running a 32-bit OS. The processor emulates its 32-bit predecessor in legacy mode, so 32-bit software runs. Given a 64-bit processor, why can't 64-bit applications run under a 32-bit Operating System? Because the O.S. provides the environment in which the application runs. There are several problems: system calls could be probably be thunked by a library, but the virtual memory space is a deal breaker. A 32-bit O.S. deals with 32-bit addresses; it can't support the address space of a 64-bit app. Running a 32-bit O.S., the processor stays in 32-bit legacy mode. Enabling the processor's 64-bit mode is a privileged operation; the application cannot do it. Incidentally, the other direction works pretty well: a 64-bit operating system can run 32-bit applications. The AMD64 architecture, also adopted by Intel, has a compatibility mode for creating 32-bit virtual address spaces within the native 64-bit address space. I'm close to the 2KB. For more, search on AMD64 Architecture. -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing Video conference software for Windows
Someone said about VNC... I'll take a look, but since it is an exercise I need to do it, Exercises typically need you to implement, not invent (leave that for a thesis or a dissertation). Rather than invent VNC, you could just implement it on your own from the specs. http://realvnc.com/docs/rfbproto.pdf I can't just say someone else arelady did that :) No. But you can build upon it :-). Few construct software from the scratch. -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Ben Finney wrote: Ilias Lazaridis [EMAIL PROTECTED] writes: Where can I find _compact_ documentation about Can you tell us what is lacking about the documentation at URL:http://www.python.org/doc/ ? Specifically, what problems have you found in understanding these topics from the documentation available at that site? Of course: Unifying types and classes in Python 2.2 Python Version: 2.2.3 Guido van Rossum This paper is an incomplete draft. I am soliciting feedback. If you find any problems, please write me at [EMAIL PROTECTED] http://www.python.org/download/releases/2.2.3/descrintro/ - Weaknesses: * draft version * written by the system designer * size * code examples uncolored * code examples missaligned - I've looking for a _compact_ analysis of this topic, prefered in standard OO jargon. Around 100 lines and 1 diagramm (or 500 lines and 3 diagramms, but not more). . -- http://lazaridis.com -- http://mail.python.org/mailman/listinfo/python-list
Re: send with timeout socket
Stéphane Ninin wrote: I have a few questions regarding sockets with timeouts. Assuming you set a timeout t on a socket s and then call: 1) s.sendall Is the socket.timeout exception thrown when not the data was sent in the given time t or if nothing was sent ? Neither; not exactly anyway. It may call send() several times, and it raises socket.timeout if any of the calls blocks for longer than the socket's timeout. 2) Similar question for s.send: Is the socket.timeout exception thrown when nothing was sent or ... ? Raised when and only when nothing was sent. -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
Does Python provide Struct data structure?
Hello all:
I have found a useful module in IPython, named 'from IPython.ipstruct
import Struct.
So I can use it as follows:
from IPython.ipstruct import Struct
mystruct = Struct(echo = 1,
verb = 'Verbose',
filedir = 'C:/temp',
)
print mystruct.filedir
#
I have two following questions:
1 Does Python provide such Struct in this standard libary.
Python has 4.3 struct -- Interpret strings as packed binary data, but
it looks like different
from what I really want to get.
2 Is it safe to use IPython's modules in my python program?
I will pack all my code into an executable application by using py2exe.
The clients would like to use this application without any python
intallation.
What should I pay attention if I include the IPython modules into my
python code and
convert it into executable application by using py2exe?
The setup.py for my application is as follows:
###
from distutils.core import setup
import py2exe
options = {
bundle_files: 1,
# ascii: 1, # to make a smaller executable, don't include the
encodings
compressed: 1, # compress the library archive
}
setup(
# The first three parameters are not required, if at least a
# 'version' is given, then a versioninfo resource is built from
# them and added to the executables.
version = 1.0,
description = mycode,
name = mycode,
options = {py2exe: options},
zipfile = None, # append zip-archive to the executable.
# targets to build
console=['mycode.py'],
)
###
Does I need to make any modification if I include IPython module in my
code?
Thank you for your helps
-Daniel
--
http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
Saizan wrote: Why subclassing bool from int either __invert__ or __neg__ haven't been overrided to produce a boolean negation? I wonder what -True or -False should evaluate to. Regards, Björn -- BOFH excuse #297: Too many interrupts -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.5 WinXP AMD64
Bryan Olson wrote: The O.P. has a 64-bit Athlon processor, but is running a 32-bit OS. The processor emulates its 32-bit predecessor in legacy mode, so 32-bit software runs. Ah, of course. Thanks for all replies! :) Regards, Björn -- BOFH excuse #13: we're waiting for [the phone company] to fix that line -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Python provide Struct data structure?
Daniel Mark wrote: I have found a useful module in IPython, named 'from IPython.ipstruct import Struct. So I can use it as follows: from IPython.ipstruct import Struct mystruct = Struct(echo = 1, verb = 'Verbose', filedir = 'C:/temp', ) print mystruct.filedir # Does 'Bunch' fit the bill? http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52308 ... jay graves -- http://mail.python.org/mailman/listinfo/python-list
Re: send with timeout socket
Stéphane Ninin wrote: Yes, I typed it *really* too fast, it would be more something like this: def sendall(self, data): while data: try: n = self.request.send(data) data = data[n:] except socket.timeout, e: if self.isTerminated(): return And from a previous post: (self.isTerminated just checks is some event has been set by another thread) Do you want to timeout on inactivity, or do you want to timeout if sendall() does not complete within a given time? -- --Bryan -- http://mail.python.org/mailman/listinfo/python-list
overrideredirect and Text widget
Hi again,Last afternoon I posted a question regarding the loss of keyboard in an undecorated window. Last night I tried again, at home, and the same code worked fine. The difference: it failed under (Gentoo) Linux, it succeeded under Win 2000, both running Python 2.4.x.So, I guess, my question now is how to achieve the desired behaviour under Linux?Thanks for your advice,Sorin-- http://mail.python.org/mailman/listinfo/python-list
Global module variables as default parameters
Hi, list... I wondered if it's possible to use global (module) variables as default parameters. A simple working example: #!/usr/bin/python globalvar = 123 def test(foo=globalvar): print foo test() Running this script prints 123. That's what I expected. Now I'm trying the same thing in a module context. A non-working example: test.py #!/usr/bin/python import TestModule TestModule.globalvar = 123 TestModule.def1() TestModule.def2() TestModule.py globalvar = 0 def def1(): print globalvar def def2(foo=globalvar): print foo Running the test.py script prints 123 and 0. So accessing the globalvar in def1() works. But if I try to use the global variable as a default parameter in def2() it uses the default 0. What is the difference between these two? Are there contexts of default parameters? Thanks for any enlightenment. Christoph -- http://mail.python.org/mailman/listinfo/python-list
Anyone use PyPar (Python MPI implementation) recently?
Has anyone used PyPar ( http://datamining.anu.edu.au/~ole/pypar/ ) recently? I _do_ want to do MPI (not BSP) but I don't need any advanced MPI things... and PyPar seemed just up my ally... but alas it doesn't compile: ### [umbriel][~/download/pypar_1_9_2] python setup.py --prefix=$MY_PREFIX cc: unrecognized option '-showme' /usr/lib/gcc/i386-redhat-linux/4.1.1/../../../crt1.o: In function `_start': (.text+0x18): undefined reference to `main' collect2: ld returned 1 exit status distcc[12384] ERROR: compile (null) on localhost failed /usr/local/mpi/1.2.5/bin/mpicc: line 297: echo: write error: Broken pipe /usr/local/mpi/1.2.5/bin/mpicc: line 372: echo: write error: Broken pipe + for arg in '$@' + '[' 0 = 1 ']' + case $arg in + allargs=' -c' + compileargs=' -c' + '[' 1 = 1 -a -n '' ']' + DoLink=0 + HasDashC=1 + for arg in '$@' + '[' 0 = 1 ']' + case $arg in + allargs=' -c /tmp/tmpP7n2tD.c' + '[' -s /tmp/tmpP7n2tD.c ']' ++ expr /tmp/tmpP7n2tD.c : '.*\(\..*\)' + ext=.c + '[' .c = .c ']' + DoCompile=1 + compileargs=' -c /tmp/tmpP7n2tD.c' ++ basename /tmp/tmpP7n2tD.c .c + fname=tmpP7n2tD + linkobjs=' tmpP7n2tD.o' + for arg in '$@' + '[' 0 = 1 ']' + case $arg in + allargs=' -c /tmp/tmpP7n2tD.c -o' + '[' 1 = 1 ']' + compileargs=' -c /tmp/tmpP7n2tD.c -o' + for arg in '$@' + '[' 0 = 1 ']' + case $arg in + allargs=' -c /tmp/tmpP7n2tD.c -o /tmp/tmpP7n2tD.o' + '[' -s /tmp/tmpP7n2tD.o ']' ++ expr /tmp/tmpP7n2tD.o : '.*\(\..*\)' + ext=.o + '[' .o = .c ']' + '[' .o = .s ']' + '[' .o = .o ']' + '[' 1 = 1 ']' + compileargs=' -c /tmp/tmpP7n2tD.c -o /tmp/tmpP7n2tD.o' + status=0 + '[' 1 = 1 -o 0 = 1 ']' + '[' 1 '!=' 1 ']' + eval cc -DUSE_STDARG -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_UNISTD_H=1 -DHAVE_STDARG_H=1 -DUSE_STDARG=1 -DMALLOC_RET_VOID=1 -c /tmp/tmpP7n2tD.c -o /tmp/tmpP7n2tD.o -I/usr/local/mpi/1.2.5/include ++ cc -DUSE_STDARG -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_UNISTD_H=1 -DHAVE_STDARG_H=1 -DUSE_STDARG=1 -DMALLOC_RET_VOID=1 -c /tmp/tmpP7n2tD.c -o /tmp/tmpP7n2tD.o -I/usr/local/mpi/1.2.5/include + status=0 + '[' 0 '!=' 0 ']' + '[' 0 = 1 -o 0 = 1 ']' + exit 0 usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...] or: setup.py --help [cmd1 cmd2 ...] or: setup.py --help-commands or: setup.py cmd --help error: option --prefix not recognized ## This is on Fedora Core5. I know that MPI and such are setup fine... as I use them daily in a C++ code. Thanks for any help! -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Fredrik Lundh wrote: Ilias Lazaridis wrote: note: I am aware about search engines. but you're incapable of using them, or ? - I ask for documentation which other developers have found useful most recent Python books contains good discussions of the things you're asking for. maybe you should buy a book ? I'm interested in online resources, experiences etc.. Maybe you can clarify some things (for me and for readers): Do I need old style classes? Does the python standard library use old style classes? Have those old style classes any benefits? . -- http://lazaridis.com -- http://mail.python.org/mailman/listinfo/python-list
I need some help with a regexp please
Hi,My $0.02:re.compile('^\w+([\.-]?\w+)[EMAIL PROTECTED]([\.-]?\w+)*\.(\w{2}|(com|net|org|edu|intl|mil|gov|arpa|biz|aero|name|coop|info|pro|museum))$')I picked it up from the Net, and while it may be not perfect (you've got lots of reply's telling you why),it's good enough for me.Good luck,Sorin--
http://mail.python.org/mailman/listinfo/python-list
Re: Global module variables as default parameters
In [EMAIL PROTECTED], Christoph Haas wrote: TestModule.py globalvar = 0 def def1(): print globalvar def def2(foo=globalvar): print foo Running the test.py script prints 123 and 0. So accessing the globalvar in def1() works. But if I try to use the global variable as a default parameter in def2() it uses the default 0. What is the difference between these two? Are there contexts of default parameters? Default parameters are evaluated *once* when the ``def`` is executed. So in `def2` the value of `foo` won't be looked up when calling the function as it is already bound to the value 0. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
Bjoern Schliessmann wrote: Saizan wrote: Why subclassing bool from int either __invert__ or __neg__ haven't been overrided to produce a boolean negation? I wonder what -True or -False should evaluate to. Regards, Björn -- BOFH excuse #297: Too many interrupts Well in boolean notation -True == False and -False == True, actually you may prefer ¬ or a line over the term, but since there's no such operator in python I think we should use - which is also the operator used by Bool himself in his formulation for negation which was 1-x. Now that I think of it 1-x should work as a negation in Python, too, since True == 1 and False == 0, but it would be a little annoying to write expressions in this way. -- http://mail.python.org/mailman/listinfo/python-list
Re: Global module variables as default parameters
Christoph Haas wrote: Hi, list... I wondered if it's possible to use global (module) variables as default parameters. A simple working example: #!/usr/bin/python globalvar = 123 def test(foo=globalvar): print foo test() Running this script prints 123. That's what I expected. Now I'm trying the same thing in a module context. A non-working example: test.py #!/usr/bin/python import TestModule TestModule.globalvar = 123 TestModule.def1() TestModule.def2() TestModule.py globalvar = 0 def def1(): print globalvar def def2(foo=globalvar): print foo Running the test.py script prints 123 and 0. So accessing the globalvar in def1() works. But if I try to use the global variable as a default parameter in def2() it uses the default 0. What is the difference between these two? Are there contexts of default parameters? Yes, and that context is the function definition which is executable code, too. Whatever the variable 'right' in a statement like def f(left=right): ... is bound to when the def is executed will become the default for the 'left' argument. This should become clear when you create more than one function with the same fs = [] for i in range(3): ... def f(i=i): print i ... fs.append(f) ... for f in fs: f() ... 0 1 2 Use a sentinel when you don't want that behaviour: def f(foo=None): if foo is None: foo = globalvar # ... Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
Saizan wrote: Why subclassing bool from int either __invert__ or __neg__ haven't been overrided to produce a boolean negation? I suspect backwards compatibility or something alike, but I still wonder.. And since bool can't be subclassed, to have a type like bool but with boolean negation what do you suggest? A wrapper maybe? (I would use it so I can evaluate user-defined boolean expression creating istances of his/her variables in my namespace and than eval() his/her expression) The not operator and the bool() builtin produce boolean results. Since bool is a subclass of int, all the integer operations will remain integer operations. This was done for backwards compatability, and is unlikely to change in the 2.x series. I don't remember if this is supposed to change in 3.0. See PEP 3100 and 3099. John Roth John Roth -- http://mail.python.org/mailman/listinfo/python-list
Re: Anyone use PyPar (Python MPI implementation) recently?
Nevermind... I'm an idiot... just didn't specify the right options... python setup.py install --prefix=$MY_PREFIX Works just fine... sigh. Friedmud -- http://mail.python.org/mailman/listinfo/python-list
XML parser that sorts elements?
Hi everyone, I am a total newbie to XML parsing. I've written a couple of toy examples under the instruction of tutorials available on the web. The problem I want to solve is this. I have an XML snippet (in a string) that looks like this: booga foo=1 bar=2 wellhello/well blahgoodbye/blah /booga and I want to alphabetize not only the attributes of an element, but I also want to alphabetize the elements in the same scope: booga bar=2 foo=1 blahgoodbye/blah wellhello/well /booga I've found a Canonizer class, that subclasses saxlib.HandlerBase, and played around with it and vaguely understand what it's doing. But what I get out of it is booga bar=2 foo=1 wellhello/well blahgoodbye/blah /booga in other words it sorts the attributes of each element, but doesn't touch the order of the elements. How can I sort the elements? I think I want to subclass the parser, to present the elements to the content handler in different order, but I couldn't immediately find any examples of the parser being subclassed. Thanks for any pointers! --JMike -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Ilias Lazaridis wrote: Fredrik Lundh wrote: Ilias Lazaridis wrote: note: I am aware about search engines. but you're incapable of using them, or ? - I ask for documentation which other developers have found useful most recent Python books contains good discussions of the things you're asking for. maybe you should buy a book ? I'm interested in online resources, experiences etc.. Maybe you can clarify some things (for me and for readers): Do I need old style classes? No, not for new code. Does the python standard library use old style classes? Yes, because it was easier to leave them as they were than risk introducing incompatibilities. Have those old style classes any benefits? .. No. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
On Fri, 2006-09-22 at 11:25, Saizan wrote: Bjoern Schliessmann wrote: Saizan wrote: Why subclassing bool from int either __invert__ or __neg__ haven't been overrided to produce a boolean negation? I wonder what -True or -False should evaluate to. Well in boolean notation -True == False and -False == True, actually you may prefer ¬ or a line over the term, but since there's no such operator in python [...] It's called not: not True False not False True -Carsten -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser that sorts elements?
[EMAIL PROTECTED] wrote: Hi everyone, I am a total newbie to XML parsing. I've written a couple of toy examples under the instruction of tutorials available on the web. The problem I want to solve is this. I have an XML snippet (in a string) that looks like this: booga foo=1 bar=2 wellhello/well blahgoodbye/blah /booga and I want to alphabetize not only the attributes of an element, but I also want to alphabetize the elements in the same scope: booga bar=2 foo=1 blahgoodbye/blah wellhello/well /booga I've found a Canonizer class, that subclasses saxlib.HandlerBase, and played around with it and vaguely understand what it's doing. But what I get out of it is booga bar=2 foo=1 wellhello/well blahgoodbye/blah /booga in other words it sorts the attributes of each element, but doesn't touch the order of the elements. How can I sort the elements? I think I want to subclass the parser, to present the elements to the content handler in different order, but I couldn't immediately find any examples of the parser being subclassed. You can sort them by obtaining them as tree of nodes, e.g. using element tree or minidom. But you should be aware that this will change the structure of your document and it isn't always desirable to do so - e.g. html pages would look funny to say the least if sorted in that way. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Does Python provide Struct data structure?
Daniel Mark wrote: I have two following questions: 1 Does Python provide such Struct in this standard libary. Python has 4.3 struct -- Interpret strings as packed binary data, but it looks like different from what I really want to get. Yes, that module is used when you want to deal with C structs in binary form (e.g. useful at networking with binary protocols). Try using dictionaries or custom, field-only class instances as struct. Regards, Björn -- BOFH excuse #374: It's the InterNIC's fault. -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Ilias Lazaridis wrote: Fredrik Lundh wrote: Ilias Lazaridis wrote: note: I am aware about search engines. but you're incapable of using them, or ? Well, Python new-style old-style classes in Google gives a range of discussions, but an old version of the definitive guide [1] is found via one of the later results on the first page (which is some section of the reference manual). According to that and the newer guide [2], the official documentation still isn't updated, despite it having been a good three years since new-style classes first arrived in a real Python release. Of course, the lengthening paper trail shouldn't be a surprise to you or I, but with more exciting additions to the language in 2.5, it is somewhat unnerving that the last major changes still sit partially documented in additional documentation that a beginner wouldn't be inclined to read through. I ask for documentation which other developers have found useful most recent Python books contains good discussions of the things you're asking for. maybe you should buy a book ? I'm interested in online resources, experiences etc.. And I don't see what's wrong with that. Maybe you can clarify some things (for me and for readers): Do I need old style classes? No, but you can still use them. I use them a lot. Does the python standard library use old style classes? Yes, I'd imagine, since it would otherwise have needed someone to go through the library and change everything, and I doubt that anyone is that interested to do so. Have those old style classes any benefits? That you don't have to write the bizarre conceptual accident that is (object) when declaring a top-level class? Paul [1] http://www.python.org/doc/newstyle.html [2] http://www.python.org/doc/newstyle/ -- http://mail.python.org/mailman/listinfo/python-list
Re: what is the best practice to separate Pygtk and long running thread code
Hi Thomas,
I am running WinXP so that casting processes and getting their results
is not so convenient.
I have tested idle add and it does the job : the thread is running
whenever there is no activity on the gui.
I still do not understand how it can be so responsive 'cause the thread
I am using at the moment do not have any time.sleep(ing).
I am afraid I have still to use an intermediate class between the
computing thread and the gui to send data between the two of them but
now about all the computing time is devoided to the thread.
Thanks a lot !!!
Seb.
ps : the only mod that I have done to the gui.py in the init is
def __init__(self, path='gui.glade',
root='window1',
domain=app_name, kwargs={}):
path = os.path.join(glade_dir, path)
SimpleGladeApp.__init__(self, path, root, domain, **kwargs)
self.q=Queue.Queue()
self.action=act.action(self.q)
gobject.idle_add(self.action.go)
#gobject.timeout_add (1000,self.action.go)
gobject.timeout_add (1000,self.process)
Thomas Guettler wrote:
seb wrote:
Hi,
I am using pygtk for the first times.
I am wondering what would be the best pattern to interface pygtk with
a thread.
The thread is collecting informations (over the network for example) or
is doing some long calculations.
Hi,
I would use several *processes*. If your scripts runs on Unix/Linux
you can use select() on the filedescriptors of the processes you created
with popen. On Windows you need to poll them, but maybe this is
better than threads, too. With idle_add you can get data from
the subproceses. It gets called if there are no actions in the
event-loop.
HTH,
Thomas
--
Thomas Güttler, http://www.thomas-guettler.de/ http://www.tbz-pariv.de/
E-Mail: guettli (*) thomas-guettler + de
Spam Catcher: [EMAIL PROTECTED]
--
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Re: Isn't bool __invert__ behaviour strange?
Saizan wrote: Well in boolean notation -True == False and -False == True, actually you may prefer ¬ or a line over the term, (I can't remember reading - (minus) for a standard boolean negation operator anywhere. Even C/C++ uses !.) but since there's no such operator in python I think we should use - Stop! What about the not operator? It's Python's operator for negation. which is also the operator used by Bool himself in his formulation for negation which was 1-x. Boole's original formulation uses some weird mathematical things to emulate not, and and or. Focus lies on mathematical here. Now that I think of it 1-x should work as a negation in Python, too, since True == 1 and False == 0, but it would be a little annoying to write expressions in this way. And a little unreadable ;) Regards, Björn -- BOFH excuse #445: Browser's cookie is corrupted -- someone's been nibbling on it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python programs always open source?
Ben Finney wrote: Leif K-Brooks [EMAIL PROTECTED] writes: Ben Finney wrote: So long as you're not distributing some or all of Python itself, or a derivative work, the license for Python has no legal effect on what license you choose for your own work. I was replying to Ben Finney's claim that in a hypothetical world where Python was licensed under the GPL, there would still be no restriction on distributing Python programs under a closed-source license. My claim (and IANAL) is that it doesn't matter *what* license Python is distributed under; unless you do something with Python that is a right of the copyright holder, such as distributing part or all of Python, the copyright license terms of Python have no legal effect on what license you choose for your own work. As I read the GPL, you should be ok if you don't copy, distribute or modify Python (if Python was GPL). Those are the activities covered by the GPL license. Using py2exe to make a binary with both Python and your own code would be a different matter. Even distributing a CD with a GPL Python and your python modules would be a problem, since you would be distributing GPL software with non-GPL software which will be combined into a program as you run it. If you just distribute your .py files, it probably doesn't matter if someone else will run the unholy combination of GPL Python and nongpl.py. I don't think a judge would consider executing gplpython nonglp.py being copying, distribution or modification. On the other hand, I think your doesn't matter *what* license Python is distributed under-claim holds. If we are allowed to think up other evil licenses, they could make claims on all files ever used with their evil software, and I doubt that you could develop non- trivial software without ever invoking it. Still, the important thing is that Python uses a license which is convenient for both proprietary software development and open source. -- http://mail.python.org/mailman/listinfo/python-list
Question about the article py2exe compiler in Python Cookbook by Alexander Semenov
Hello all: I follow the following tutorial http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/108598 Description: script for making executables with py2exe ## from distutils.core import setup import sys, os, py2exe name = sys.argv[1] sys.argv[1] = 'py2exe' sys.path.append(os.path.dirname(os.path.abspath(name))) setup(name=name[:-3], scripts=[name]) ## However, I can not get the expected results. 1 save the above script as file makexe.py under the folder C:\Program Files\Python24\Tools\Scripts 2 add this path to system path 3 C:\ makexe.py myscript.py What I got from the dist folder are as follows: C:\dist\unicodedata.pyd C:\dist\w9xpopen.exe C:\dist\zlib.pyd C:\dist\bz2.pyd C:\dist\library.zip C:\dist\MSVCR71.dll C:\dist\python24.dll Suppose I should get an executable file under this folder. What should I do to solve this problem? Thank you -Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser that sorts elements?
Diez B. Roggisch wrote: You can sort them by obtaining them as tree of nodes, e.g. using element tree or minidom. But you should be aware that this will change the structure of your document and it isn't always desirable to do so - e.g. html pages would look funny to say the least if sorted in that way. Diez In this particular case, I need to sort the elements, and the specific application I'm testing guarantees that the order of the elements in the same scope (this may not be the right term in XML semantics, but it's what I know how to say) does not matter. That probably means that the specific application I'm testing is not using XML in a standard way, but so be it. I'm looking at minidom now and I think maybe there's enough documentation there that I can get a handle on it and do what I need to do. Thanks. (But if anyone else has a specific example I can crib from, that'd be great.) --JMike -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser that sorts elements?
[EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Hi everyone, I am a total newbie to XML parsing. I've written a couple of toy examples under the instruction of tutorials available on the web. The problem I want to solve is this. I have an XML snippet (in a string) that looks like this: booga foo=1 bar=2 wellhello/well blahgoodbye/blah /booga and I want to alphabetize not only the attributes of an element, but I also want to alphabetize the elements in the same scope: booga bar=2 foo=1 blahgoodbye/blah wellhello/well /booga I've found a Canonizer class, that subclasses saxlib.HandlerBase, and played around with it and vaguely understand what it's doing. But what I get out of it is booga bar=2 foo=1 wellhello/well blahgoodbye/blah /booga in other words it sorts the attributes of each element, but doesn't touch the order of the elements. How can I sort the elements? I think I want to subclass the parser, to present the elements to the content handler in different order, but I couldn't immediately find any examples of the parser being subclassed. I suspect that Canonizer doesn't sort nested elements because some schemas require elements to be in a particular order, and not necessarily an alphabetical one. Here is a snippet from an interactive Python session, working with the batteries included xml.dom.minidom. The solution is not necessarily in the parser, it may be instead in what you do with the parsed document object. This is not a solution to your actual problem, but I hope it gives you enough to work with to find your own solution. HTH, -- Paul xmlsrc = booga foo=1 bar=2 ... wellhello/well ... blahgoodbye/blah ... /booga ... import xml.dom.minidom doc = xml.dom.minidom.parseString(xmlsrc) doc.childNodes [DOM Element: booga at 0x9e8508] print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 well hello /well blah goodbye /blah /booga [n.nodeName for n in doc.childNodes] [u'booga'] [n.nodeName for n in doc.childNodes[0].childNodes] ['#text', u'well', '#text', u'blah', '#text'] [n.nodeName for n in doc.childNodes[0].childNodes if n.nodeType == doc.ELEMENT_NODE] [u'well', u'blah'] doc.childNodes[0].childNodes = sorted(doc.childNodes[0].childNodes,key=lambda n:n.nodeName) print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 blah goodbye /blah well hello /well /booga doc.childNodes[0].childNodes = sorted([n for n in doc.childNodes[0].childNodes if n.nodeType == doc.ELEMENT_NODE],key=lambda n:n.nodeName) print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 blah goodbye /blah well hello /well /booga -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser that sorts elements?
Paul McGuire wrote: ... Here is a snippet from an interactive Python session, working with the batteries included xml.dom.minidom. The solution is not necessarily in the parser, it may be instead in what you do with the parsed document object. This is not a solution to your actual problem, but I hope it gives you enough to work with to find your own solution. HTH, -- Paul Whoa. Outstanding. Excellent. Thank you! --JMike -- http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
John Roth wrote: The not operator and the bool() builtin produce boolean results. Since bool is a subclass of int, all the integer operations will remain integer operations. This was done for backwards compatability, and is unlikely to change in the 2.x series. Ok, shame on me, I completely overlooked not and it surprises myself because it's not like I haven't used it, I just didn't see not as an operator, maybe because i can't find a __not__ method in bool class. (Is it hidden somewhere or is computed in some other way?) (However (not x) whould be as annoying as 1-x even if a little more readable (if you consider lispish parentheses readable): Input expression: (not (not x)(not y)!(not (z|v))) Maybe direct eval is just the wrong way of doing this, I should look for or make muParser bindings for Python instead..) -- http://mail.python.org/mailman/listinfo/python-list
Re: XML parser that sorts elements?
Paul McGuire [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] snip This is what I posted, but it's not what I typed. I entered some very long lines at the console, and the newsgroup software, when wrapping the text, prefixed it with '', not '...'. So this looks like something that wont run. doc.childNodes[0].childNodes = sorted([n for n in doc.childNodes[0].childNodes if n.nodeType == doc.ELEMENT_NODE],key=lambda n:n.nodeName) print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 blah goodbye /blah well hello /well /booga Here's the console session, with '...' continuation lines: xmlsrc = booga foo=1 bar=2 ... wellhello/well ... blahgoodbye/blah ... /booga ... import xml.dom.minidom doc = xml.dom.minidom.parseString(xmlsrc) print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 well hello /well blah goodbye /blah /booga [n.nodeName for n in doc.childNodes] [u'booga'] [n.nodeName for n in doc.childNodes[0].childNodes] ['#text', u'well', '#text', u'blah', '#text'] [n.nodeName for n in doc.childNodes[0].childNodes ...if n.nodeType == doc.ELEMENT_NODE] [u'well', u'blah'] doc.childNodes[0].childNodes = sorted( ... doc.childNodes[0].childNodes,key=lambda n:n.nodeName) [n.nodeName for n in doc.childNodes[0].childNodes ...if n.nodeType == doc.ELEMENT_NODE] [u'blah', u'well'] print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 blah goodbye /blah well hello /well /booga doc.childNodes[0].childNodes = sorted( ... [n for n in doc.childNodes[0].childNodes ... if n.nodeType==doc.ELEMENT_NODE], ... key=lambda n:n.nodeName) print doc.toprettyxml() ?xml version=1.0 ? booga bar=2 foo=1 blah goodbye /blah well hello /well /booga -- http://mail.python.org/mailman/listinfo/python-list
Re: Python programs always open source?
Magnus Lycka wrote: Ben Finney wrote: Leif K-Brooks [EMAIL PROTECTED] writes: Ben Finney wrote: So long as you're not distributing some or all of Python itself, or a derivative work, the license for Python has no legal effect on what license you choose for your own work. I was replying to Ben Finney's claim that in a hypothetical world where Python was licensed under the GPL, there would still be no restriction on distributing Python programs under a closed-source license. My claim (and IANAL) is that it doesn't matter *what* license Python is distributed under; unless you do something with Python that is a right of the copyright holder, such as distributing part or all of Python, the copyright license terms of Python have no legal effect on what license you choose for your own work. As I read the GPL, you should be ok if you don't copy, distribute or modify Python (if Python was GPL). Since Python *isn't* GPL, can we please move this discussion to universe.hypothetical.discuss? regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
Saizan wrote: (However (not x) whould be as annoying as 1-x even if a little more readable (if you consider lispish parentheses readable): Input expression: (not (not x)(not y)!(not (z|v))) Did you notice that you use bitwise AND and OR here? How about not (not x) and (not y) or (not (z or v)) (or what is ! supposed to mean?) BTW, not's binding is stronger than and's (IIRC). So not (not x) and (not y) mutates to x and (not y) Regards, Björn -- BOFH excuse #392: It's union rules. There's nothing we can do about it. Sorry. -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - New/Old Style Classes, build-in/extension types
Paul Boddie wrote: Ilias Lazaridis wrote: [...] Have those old style classes any benefits? That you don't have to write the bizarre conceptual accident that is (object) when declaring a top-level class? Though of course the easiest way to enforce your classes to new style is to begin each module with __metaclass__ = type __metaclass__ = type class X: pass ... X class '__main__.X' X() __main__.X object at 0x186c6f0c x = X() isinstance(x, object) True type(x), type(X) (class '__main__.X', type 'type') regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
Re: Question about the article py2exe compiler in Python Cookbook by Alexander Semenov
Daniel Mark schrieb: Hello all: I follow the following tutorial http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/108598 Description: script for making executables with py2exe ## from distutils.core import setup import sys, os, py2exe name = sys.argv[1] sys.argv[1] = 'py2exe' sys.path.append(os.path.dirname(os.path.abspath(name))) setup(name=name[:-3], scripts=[name]) ## However, I can not get the expected results. Someone should correct this recipe. In newer py2exe-versions, you have to use 'console=[name]' in the above script. Thomas -- http://mail.python.org/mailman/listinfo/python-list
+1 QOTW
Did anyone else crack up when Larry Wall described python with the statement: Python, as the anti-Perl, is heavily invested in maintaining Order. In the state of the onion address? http://www.perl.com/pub/a/2006/09/21/onion.html -- http://mail.python.org/mailman/listinfo/python-list
Re: Isn't bool __invert__ behaviour strange?
Saizan [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] John Roth wrote: The not operator and the bool() builtin produce boolean results. Since bool is a subclass of int, all the integer operations will remain integer operations. This was done for backwards compatability, and is unlikely to change in the 2.x series. Ok, shame on me, I completely overlooked not and it surprises myself because it's not like I haven't used it, I just didn't see not as an operator, maybe because i can't find a __not__ method in bool class. (Is it hidden somewhere or is computed in some other way?) (However (not x) whould be as annoying as 1-x even if a little more readable (if you consider lispish parentheses readable): Input expression: (not (not x)(not y)!(not (z|v))) Maybe direct eval is just the wrong way of doing this, I should look for or make muParser bindings for Python instead..) What about __nonzero__? class IsOdd(object): def __init__(self,n): self.val = n def __nonzero__(self): return self.val % 2 for i in range(4): if IsOdd(i): print i,is odd else: print i,is even Prints: 0 is even 1 is odd 2 is even 3 is odd -- Paul -- http://mail.python.org/mailman/listinfo/python-list
