Stefan Arentz wrote:
Hi. I've wrapped a C++ class with Boost.Python and that works great. But,
I am now packaging my application so that it can be distributed. The
structure is basically this:
.../bin/foo.py
.../lib/foo.so
.../lib/bar.py
In foo.py I do the following:
[EMAIL PROTECTED] wrote:
hi
I have a file which is very large eg over 200Mb , and i am going to use
python to code a tail
command to get the last few lines of the file. What is a good algorithm
for this type of task in python for very big files?
Initially, i thought of reading everything
Steven D'Aprano wrote:
On Mon, 02 Jan 2006 13:38:47 -0800, UrsusMaximus wrote:
It seems to me that, if anything of a person survives death in any way,
it must do so in some way very different from that way in which we
exist now.
[snip]
I don't dare ask where your evidence for this
I use cpython. I'm accustomed (from c++/gcc) to a style of coding that is
highly readable, making the assumption that the compiler will do good
things to optimize the code despite the style in which it's written. For
example, I assume constants are removed from loops. In general, an entity
is
Reinhold Birkenfeld wrote:
David Wilson wrote:
For the most part, CPython performs few optimisations by itself. You
may be interested in psyco, which performs several heavy optimisations
on running Python code.
http://psyco.sf.net/
I might be, if it supported x86_64, but AFAICT, it
One possible way to improve the situation is, that if we really believe
python cannot easily support such optimizations because the code is too
dynamic, is to allow manual annotation of functions. For example, gcc
has allowed such annotations using __attribute__ for quite a while. This
would
[EMAIL PROTECTED] wrote:
Hi,
I am embedding Python with a C++ app and need to provide the Python
world with access to objects data with the C++ world.
I am aware or SWIG, BOOST, SIP. Are there more?
I welcome comments of the pros/cons of each and recommendations on when
it
[EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
Neal Becker wrote:
Like a puzzle? I need to interface python output to some strange old
program. It wants to see numbers formatted as:
e.g.: 0.23456789E01
That is, the leading digit is always 0, instead of the first
significant
Paul Rubin wrote:
Neal Becker [EMAIL PROTECTED] writes:
Like a puzzle? I need to interface python output to some strange old
program. It wants to see numbers formatted as:
e.g.: 0.23456789E01
Yeah, that was normal with FORTRAN.
My solution is to print to a string with the '% 16.9E
How can I write code to take advantage of new decorator syntax, while
allowing backward compatibility?
I almost want a preprocessor.
#if PYTHON_VERSION = 2.4
@staticmethod
...
Since python 2.4 will just choke on @staticmethod, how can I do this?
--
In file included from scipy/base/src/multiarraymodule.c:44:
scipy/base/src/arrayobject.c: In function 'array_frominterface':
scipy/base/src/arrayobject.c:5151: warning: passing argument 3 of
'PyArray_New' from incompatible pointer type
error: Command gcc -pthread -fno-strict-aliasing -DNDEBUG -O2
In file included from scipy/base/src/multiarraymodule.c:44:
scipy/base/src/arrayobject.c:41: error: conflicting types for
'PyArray_PyIntAsIntp'
build/src/scipy/base/__multiarray_api.h:147: error: previous declaration of
'PyArray_PyIntAsIntp' was here
--
Suppose I have a main program, e.g., A.py. In A.py we have:
X = 2
import B
Now B is a module B.py. In B, how can we access the value of X?
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Everything you said is absolutely correct. I was being lazy. I had a main
program in module, and wanted to reorganize it, putting most of it into a
new module. Being python, it actually only took a small effort to fix this
properly, so that in B.py, what were global variables are now passed as
I can do this with a generator:
def integers():
x = 1
while (True):
yield x
x += 1
for i in integers():
Is there a more elegant/concise way?
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[EMAIL PROTECTED] wrote:
I was wondering if anyone could make recomendations/comments about CVS
systems, their experiences and what perhaps the strengths of each.
Currently we have 2 developers but expect to grow to perhaps 5.
Most of the developement is Python, but some C, Javascript,
I just installed from .tar.gz on fedora FC5 x86_64. I ran into 1 small
problem:
sudo python setup.py install --verbose
running install
running bdist_egg
running egg_info
writing functional.egg-info/PKG-INFO
writing top-level names to functional.egg-info/top_level.txt
reading manifest file
I'd like to build a module that would redirect stdout to send it to a logging
module. I want to be able to use a python module that expects to print
results using print or sys.stdout.write() and without modifying that
module, be able to redirect it's stdout to a logger which will send the
I see list has index member, but is there an index function that applies to
any sequence type?
If not, shouldn't there be?
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I'd like to turn off ZeroDivisionError. I'd like 0./0. to just give NaN,
and when output, just print 'NaN'. I notice fpconst has the required
constants. I don't want to significantly slow floating point math, so I
don't want to just trap the exception.
If I use C code to turn off the hardware
[EMAIL PROTECTED] wrote:
Would a wrapper function be out of the question here?
def MyDivision(num, denom):
if denom==0:
return NaN
else
return num / denom
I bought a processor that has hardware to implement this. Why do I want
software to waste time on it?
--
Christian Heimes wrote:
Grant Edwards wrote:
A more efficient implementation? Just delete the code that
raises the exception and the HW will do the right thing.
Do you really think that the hardware and the C runtime library will do
the right thing? Python runs on a lots platforms and
Jean-Paul Calderone wrote:
On Mon, 11 Feb 2008 09:15:07 -0500, Neal Becker [EMAIL PROTECTED]
wrote:
Is there a simple way to use a 'with' statement to redirect stdout in a
block?
Do you mean without writing a context manager to do the redirection?
I mean, whatever is the simplest solution
Is there a simple way to use a 'with' statement to redirect stdout in a
block?
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Thanks! I understand this better now. This is really an example of a more
general pattern:
@contextmanager
def rebind_attr(object_, attr, value):
orig = getattr(object_, attr)
setattr(object_, attr, value)
yield
setattr(object_, attr_, orig)
--
Mark Dickinson wrote:
On Feb 10, 3:10 pm, [EMAIL PROTECTED] wrote:
What Python run on a CPU that doesn't handle the nan correctly?
How about platforms that don't even have nans? I don't think either
IBM's hexadecimal floating-point format, or the VAX floating-point
formats
support NaNs.
This will work for stdout:
from __future__ import with_statement
from contextlib import contextmanager
import sys
@contextmanager
def redirect(newfile):
orig_stdout = sys.stdout
sys.stdout = newfile
yield
sys.stdout = orig_stdout
if __name__ == __main__:
with redirect
I'd like to output some data directly in .ods format. This format appears
to be quite complex. Is there any python software available to do this? I
did look at pyuno briefly. It looks pretty complicated also, and it looks
like it uses it's own private version of python, which would not help
Rolf van de Krol wrote:
Neal Becker wrote:
I'd like to output some data directly in .ods format. This format
appears
to be quite complex. Is there any python software available to do this?
I
did look at pyuno briefly. It looks pretty complicated also, and it
looks like it uses it's own
Guilherme Polo wrote:
2008/2/13, Neal Becker [EMAIL PROTECTED]:
I'd like to output some data directly in .ods format.
Do you want to output data from .ods file or do you want to input data
into an ods ?
This format appears
to be quite complex. Is there any python software available
Ben Finney wrote:
Neal Becker [EMAIL PROTECTED] writes:
I'd like to output some data directly in .ods format.
Presumably you mean the OpenDocument Spreadsheet format. That's not
OOXML, it's ODF, the international standard document format
implemented in OpenOffice.org, KOffice, and many
I'm working on a simple extension. Following the classic 'noddy' example.
In [15]: cmplx_int32
Out[15]: type 'numpy.cmplx_int32'
Now I want to add an attribute to this type. More precisely, I want a class
attribute.
cmplx_int32.test = 0
7stud wrote:
On Feb 21, 11:19 am, Neal Becker [EMAIL PROTECTED] wrote:
I'm working on a simple extension. Following the classic 'noddy'
example.
In [15]: cmplx_int32
Out[15]: type 'numpy.cmplx_int32'
Now I want to add an attribute to this type. More precisely, I want a
class attribute
Steve Holden wrote:
Neal Becker wrote:
7stud wrote:
On Feb 21, 11:19 am, Neal Becker [EMAIL PROTECTED] wrote:
I'm working on a simple extension. Following the classic 'noddy'
example.
In [15]: cmplx_int32
Out[15]: type 'numpy.cmplx_int32'
Now I want to add an attribute to this type
Steve Holden wrote:
Neal Becker wrote:
Steve Holden wrote:
Neal Becker wrote:
7stud wrote:
On Feb 21, 11:19 am, Neal Becker [EMAIL PROTECTED] wrote:
I'm working on a simple extension. Following the classic 'noddy'
example.
In [15]: cmplx_int32
Out[15]: type 'numpy.cmplx_int32'
Now
Nathan Pinno wrote:
How do I factor a number? I mean how do I translate x! into proper
Python code, so that it will always do the correct math?
Thanks in advance,
Nathan P.
import os
os.system('factor 25')
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I need an ioctl call equivalent to this C code:
my_struct s;
s.p = p; a pointer to an array of char
s.image_size = image_size;
return (ioctl(fd, xxx, s));
I'm thinking to use python array for the array of char, but I don't see how
to put it's address into the structure. Maybe
On linux, I don't understand why:
f = open ('/dev/eos', 'rw')
m = mmap.mmap(f.fileno(), 100, prot=mmap.PROT_READ|mmap.PROT_WRITE,
flags=mmap.MAP_SHARED)
gives 'permission denied', but this c++ code works:
#include sys/mman.h
#include fcntl.h
#include sys/types.h
#include sys/stat.h
#include
Gabriel Genellina wrote:
En Fri, 25 Apr 2008 09:30:56 -0300, Neal Becker [EMAIL PROTECTED]
escribió:
I need an ioctl call equivalent to this C code:
my_struct s;
s.p = p; a pointer to an array of char
s.image_size = image_size;
return (ioctl(fd, xxx, s));
I'm thinking
Any ideas on python packages that could help with sending gpg encrypted
(properly mime formatted) emails?
My idea is to forward all my emails to a remote imap server, but gpg encrypt
them to myself in the process.
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I'm looking for something to do template processing. That is, transform
text making various substitutions. I'd like to be able to do substitutions
that include python expressions, to do arithmetic computations within
substitutions.
I know there are lots of template packages, but most seem
Maybe I'm missing something obvious here
def A (...):
#set a bunch of variables
x = 1
b = 2
...
Do something with them
def B (...):
#set the same bunch of variables
x = 1
b = 2
...
Do something with them
I want to apply DRY, and extract out the common setting of these
Bruno Desthuilliers wrote:
Neal Becker a écrit :
Maybe I'm missing something obvious here
def A (...):
#set a bunch of variables
x = 1
b = 2
...
Do something with them
def B (...):
#set the same bunch of variables
x = 1
b = 2
...
Do something with them
I
I have some code that uses atexit (remove old log files). Before converting
to use multiprocessing, it worked. Since converting, it seems to not be
running the atexit code (old log files are not removed).
Any known issues with multiprocessing + atexit?
--
Qian Xu wrote:
Hi All,
I have a problem with OptParse.
I want to define such an arugument. It can accept additional value or no
value.
myscript.py --unittest File1,File2
myscript.py --unittest
Is it possible in OptParse? I have tried several combination. But ...
Best regards
How do I interleave 2 sequences into a single sequence?
How do I interleave N sequences into a single sequence?
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While solving this problem, is it possible also to address an issue that
shows up in certain distributions? I'm specifically talking about the fact
that on Redhat/Fedora, we have on x86_64 both /usr/lib/pythonxx/ and
/usr/lib64/pythonxx. The former is supposed to be for non-arch specific
I'm trying to make a multiplexor and demultiplexor, using generators. The
multiplexor will multiplex N sequences - 1 sequence (assume equal length).
The demultiplexor will do the inverse.
The mux seems easy enough:
---
def mux (*ranges):
iterables = [iter (r) for r
pataphor wrote:
On 07 Apr 2009 02:05:59 GMT
Steven D'Aprano ste...@remove.this.cybersource.com.au wrote:
The demuxer can't be an iterator, since it needs to run through the
entire collection.
Then your demuxer obviously cannot handle infinite sequences.
def demux(it, n):
In hindsight, I am disappointed with the choice of conditional syntax. I know
it's too late to change. The problem is
y = some thing or other if x else something_else
When scanning this my eye tends to see the first phrase and only later notice
that it's conditioned on x (or maybe not notice
Aaron Castironpi Brady wrote:
On Sep 23, 6:52 pm, Neal Becker [EMAIL PROTECTED] wrote:
In hindsight, I am disappointed with the choice of conditional syntax. I
know it's too late to change. The problem is
y = some thing or other if x else something_else
When scanning this my eye tends
I have a class (actually implemented in c++ using boost::python). For an
instance of this class, 'r', I'd like to support len (r). I don't want to add
it to the c++ code, because this is a unique situation: this class should not
normally support len().
So I try:
r = ring_int (10)
r.__len__ =
Diez B. Roggisch wrote:
BTW, could you stop setting the followup-to to a non-existing (at least
for a standard newsreader) gmane-newsgroup?
Is this any better?
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I know we have 'email' module. Is there something I could use to produce
properly mime-encoded gpg encrypted messages?
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In an earlier post, I was interested in passing a pointer to a structure to
fcntl.ioctl.
This works:
c = create_string_buffer (...)
args = struct.pack(iP, len(c), cast (pointer (c), c_void_p).value)
err = fcntl.ioctl(eos_fd, request, args)
Now to do the same with ctypes, I have one problem.
[EMAIL PROTECTED] wrote:
Neal Becker napisał(a):
In an earlier post, I was interested in passing a pointer to a structure
to fcntl.ioctl.
This works:
c = create_string_buffer (...)
args = struct.pack(iP, len(c), cast (pointer (c), c_void_p).value)
err = fcntl.ioctl(eos_fd, request, args
[EMAIL PROTECTED] wrote:
Neal Becker napisał(a):
In an earlier post, I was interested in passing a pointer to a structure
to fcntl.ioctl.
This works:
c = create_string_buffer (...)
args = struct.pack(iP, len(c), cast (pointer (c), c_void_p).value)
err = fcntl.ioctl(eos_fd, request, args
What is a good way to emulate:
from module import xxx
where 'module' is a dynamically generated string?
__import__ ('modulename', fromlist=['xxx'])
seems to be what I want, but then it seems 'xxx' is not placed in globals()
(which makes me wonder, what exactly did fromlist do?)
--
Guilherme Polo wrote:
On Tue, Jul 1, 2008 at 12:11 PM, Neal Becker [EMAIL PROTECTED] wrote:
What is a good way to emulate:
from module import xxx
where 'module' is a dynamically generated string?
__import__ ('modulename', fromlist=['xxx'])
seems to be what I want, but then it seems 'xxx
Just to confirm, the profiling numbers (from cProfile) do include time spent
inside my own C functions that I import as modules?
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After spending the morning debugging where I had misspelled the name of an
attribute (thus adding a new attr instead of updating an existing one), I
would like a way to decorate a class so that attributes cannot be (easily)
added.
I guess class decorators are not available yet (pep 3129), but
Robert Bossy wrote:
class Foo(Freezeable):
def __init__(self):
self.bar = 42
self.freeze() # ok, we set all variables, no more from here
x = Foo()
print x.bar
x.bar = -42
print x.bar
x.baz = OMG! A typo!
Pretty nice, but unfortunately the subclass has to remember to call freeze
in
Just a little python humor:
http://www.amazon.com/Vitamin-Shoppe-Python-Extra-tablets/dp/B00012NJAK/ref=sr_1_14/103-7715091-4822251?ie=UTF8s=hpcqid=1183917462sr=1-14
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Danyelle Gragsone wrote:
Nope.. not a one..
/sarcasm
On 7/8/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
On Jul 8, 12:59?pm, Neal Becker [EMAIL PROTECTED] wrote:
Just a little python humor:
http://www.amazon.com/Vitamin-Shoppe-Python-Extra-tablets/dp/B00012NJ...
Aren't there any
import exceptions
class nothing (exceptions.Exception):
def __init__ (self, args=None):
self.args = args
if __name__ == __main__:
raise nothing
Traceback (most recent call last):
File stdin, line 1, in module
File /usr/tmp/python-3143hDH, line 5, in __init__
self.args =
Alex Popescu wrote:
Neal Becker [EMAIL PROTECTED] wrote in
news:[EMAIL PROTECTED]:
import exceptions
class nothing (exceptions.Exception):
def __init__ (self, args=None):
self.args = args
if __name__ == __main__:
raise nothing
Traceback (most recent call last
I'm wondering if a generator that is within a 'with' scope exits the 'with'
when it encounters 'yield'.
I would like to use a generator to implement RAII without having to
syntactically enclose the code in the 'with' scope, and I am hoping that
the the yield does not exit the 'with' scope and
Anyone testing on xemacs? I tried it, and C-c C-c sent xemacs into an
infinite loop (apparantly).
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Edward Loper wrote:
Anyone testing on xemacs? I tried it, and C-c C-c sent xemacs into an
infinite loop (apparantly).
It works fine for me in XEmacs 21.4 (patch 17) (i386-debian-linux,
Mule). If you could answer a few questions, it might help me track down
the problem:
- What version
I have a list of strings (sys.argv actually). I want to print them as a
space-delimited string (actually, the same way they went into the command
line, so I can cut and paste)
So if I run my program like:
./my_prog a b c d
I want it to print:
'./my_prog' 'a' 'b' 'c' 'd'
Just print sys.argv
What do I need to do? I have numpy, scipy (Fedora F8)
cd openopt/
[EMAIL PROTECTED] openopt]$ python setup.py build
running build
running config_cc
unifing config_cc, config, build_clib, build_ext, build commands --compiler
options
running config_fc
unifing config_fc, config, build_clib,
How do I tell if my python-2.5 is build with ucs2 or ucs4?
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David Delony wrote:
I spoke with Eric S. Raymond at a Linux user's group meeting a few days
ago about the need for version control for end users.
I thought that Python might be a good candidate for this.
Luckily, Guido was there as well. I talked this over with him and he
suggested using
What's a good/fast way to find the index of the minimum element of a
sequence? (I'm fairly sure sorting the sequence is not the fastest
approach)
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Henry Baxter wrote:
Oops, gmail has keyboard shortcuts apparently, to continue:
def maxi(l):
m = max(l)
for i, v in enumerate(l):
if m == v:
return i
But it seems like something that should be built in - or at least I should
be able to write a lambda
I want python code that given an instance of a type, prints the type name,
like:
typename (0) - 'int'
I know how to do this with the C-api, (o-tp_name), but how do I do it from
python?
type(0) prints type 'int', not really what I wanted.
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I was not aware of MyHDL, sounds interesting.
But, last release was May 2006. I wonder if it still active?
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Hi numeric processing fans. I'm pleased to report that you can now have
convenient checkpoint/restart, at least if you are running fedora linux.
Example:
python -i blcr_mod.py this will start python, then checkpoint it
c_int(2) (ignore this debug)
[quit]
cr_restart checkpoint.nbecker1.23768
I'm trying to use mechanize to read for a M$ mail server. I can get past the
login page OK using:
import mechanize
b = mechanize.Browser()
b.open
('https://mail.hughes.com/owa/auth/logon.aspx?url=https://mail.hughes.com/OWA/reason=0')
b.select_form(nr=0)
b['username']='myname'
Sounds simple, but how, given an instance, do I find the class?
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Any ideas on this?
bb-freeze test5-coded-pre.py
WARNING: found xml.sax in multiple directories. Assuming it's a namespace
package. (found in /usr/lib64/python2.5/site-packages/_xmlplus/sax,
/usr/lib64/python2.5/xml/sax)
*** applied function recipe_doctest at 0xc618c0
recipe_matplotlib: using
Alexander Schmolck wrote:
Adam Jenkins [EMAIL PROTECTED] writes:
On Fri, Aug 8, 2008 at 7:32 AM, Michele Simionato
[EMAIL PROTECTED] wrote:
On Aug 7, 5:55 pm, Alexander Schmolck [EMAIL PROTECTED] wrote:
...
I have solved by using ipython.el which was already installed. For the
sake of
Is there a posix semaphore wrapper for python?
Would that be a good addition?
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Christian Heimes wrote:
Neal Becker wrote:
Is there a posix semaphore wrapper for python?
Would that be a good addition?
The threading module provides a high level interface to native
semaphores, e.g. pthread.
Christian
Does that provide semaphores between unrelated processes
I'm just trying out pyparsing. I get stack overflow on my first try. Any
help?
#/usr/bin/python
from pyparsing import Word, alphas, QuotedString, OneOrMore, delimitedList
first_line = '[' + delimitedList (QuotedString) + ']'
def main():
string = '''[ 'a', 'b', 'cdef']'''
greeting =
I need to organize the results of some experiments. Seems some sort of
database is in order.
I just took a look at DBAPI and the new sqlite interface in python2.5. I
have no experience with sql. I am repulsed by e.g.:
c.execute(insert into stocks
values
Neal Becker wrote:
I need to organize the results of some experiments. Seems some sort of
database is in order.
I just took a look at DBAPI and the new sqlite interface in python2.5. I
have no experience with sql. I am repulsed by e.g.:
c.execute(insert into stocks
values
robert wrote:
In a makefile I want to locate the .so for a dynamically linked
Python on Linux. (for cx_Freeze's --shared-lib-name)
e.g. by running a small script with that Python. How to?
Robert
How about run python -v yourscript and filter the output?
--
What's wrong with this?
type(struct.unpack('l','\00'*8)[0])
type 'int'
Why I am getting 'int' when I asked for 'long'?
This is on python-2.5.1-15.fc8.x86_64
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I have all my options setup with optparse. Now, I'd like to be able to
parse an ini file to set defaults (that could be overridden by command line
switches).
I'd like to make minimal change to my working optparse setup (there are lots
of options - I don't want to duplicate all the cmdline
Martin Marcher wrote:
Hi,
On 12/6/07, Neal Becker [EMAIL PROTECTED] wrote:
configparse looks like what I want, but it seems last commit was 2years
ago.
What is the best choice?
that seems like configparse is the best choice.
Thanks. I see something right off that should be improved
I'm looking for recommendations for writing a user manual. It will need
lots of examples of command line inputs and terminal outputs.
I'd like to minimize the effort to integrate the terminal input/output into
my document. I have lots of experience with latex, but I wonder if there
may be some
Maybe find a spell checker?
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Felipe Almeida Lessa wrote:
Em Sáb, 2006-04-08 às 20:08 -0700, [EMAIL PROTECTED] escreveu:
My python program spits lot of data. I take that data and plot graphs
using OfficeOrg spredsheet. I want to automate this task as this takes
so much of time. I have some questions.
You can try
To implement logging, I'm using a class:
class logger (object):
def __init__ (self, name):
self.name = name
self.f = open (self.name, 'w')
def write (self, stuff):
self.f.write (stuff)
def close (self):
self.f.close()
def flush (self):
Bruno Desthuilliers wrote:
Neal Becker a écrit :
To implement logging, I'm using a class:
If I may ask : any reason not to use the logging module in the stdlib ?
Don't exactly recall, but needed some specific behavior and it was just
easier this way.
class logger (object):
def
Code at global scope in a module is run at module construction (init). Is
it possible to hook into module destruction (unloading)?
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One thing I sometimes miss, which is common in some other languages (c++),
is idea of block scope. It would be useful to have variables that did not
outlive their block, primarily to avoid name clashes. This also leads to
more readable code. I wonder if this has been discussed?
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James Stroud wrote:
Paul Rubin wrote:
John Nagle [EMAIL PROTECTED] writes:
In a language with few declarations, it's probably best not to
have too many different nested scopes. Python has a reasonable
compromise in this area. Functions and classes have a scope, but
if and for do not.
After just getting bitten by this error, I wonder if any pylint, pychecker
variant can detect this error?
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