prevent memory leak in C+Python

Hi, I am wrapping a C function returning large amount of binary data back to Python using SWIG. I have the data malloc()ed or new()ed on the heap and buffer objects seem a good way to wrap it in python (http://docs.python.org/api/bufferObjects.html) >From the documentation it seems PyBuffer_Fro

Re: Bug on Python2.3.4 [FreeBSD]?

Saturday 13 August 2005 06:18 am Donn Cave wrote: > Of course, but the question was, where do reads start? I would > guess the GNU C library "innovated" on this point. But in the > end it doesn't really matter unless Python is going to try to > square that all up and make open() consistent acros

Re: Bug on Python2.3.4 [FreeBSD]?

Friday 12 August 2005 22:12 pm David Bolen wrote: > Which version of FreeBSD are you running? I thought it might be a > dependency on needing to seek between reads and writes on a duplex > stream (which is ANSI), but FreeBSD doesn't require that, at least > back as far as a 4.7 system I have, and

Re: Bug on Python2.3.4 [FreeBSD]?

Friday 12 August 2005 22:12 pm paolino wrote: [...] >f = open('test', 'a+') >f.read() >> >> '' >> >> -> append mode does not read from file, *not ok* >> >> > This is right IMO 'a' is appending so seek(-1) True, thank you. f.tell() shows the file pointer is at EOF. On my Debian Linux (u

Bug on Python2.3.4 [FreeBSD]?

Hi, AFAICT there seems to be a bug on FreeBSD's Python 2.3.4 open function. The documentation states: > Modes 'r+', 'w+' and 'a+' open the file for updating (note that 'w+' > truncates the file). Append 'b' to the mode to open the file in binary > mode, on systems that differentiate between bin

super problem

Hi, I have a diamond-shaped multiple inheritanc chain with new style classes, but super() does not call the parent class correctly: -- snip -- from qtcanvas import * class B2(QCanvasItem): def move(self, x,y): super(B2, self).move(0,0) print "B2" class C2(QCanvasItem): d

Life of Python

Hi, I have come across the following statement a number of times: http://mail.python.org/pipermail/python-list/2003-July/171805.html [... how to enforce pure abstract class ...] > Python, in general, doesn't try to stop the programmer doing things, the > way many other languages do. This is know

Re: Favorite non-python language trick?

Friday 24 June 2005 09:18 am Enrico wrote: [...] >> --This code will, because the first two dashes make the rest a comment, >> breaking the block >> ---[[ >> print(10) >> --]] [...] > python: > > """ > print 10 > """ > > and > > #""" > print 10 > #""" > > C++: > > /* > print(10); > */ > > a

Re: don't understand MRO

Thursday 23 June 2005 19:22 pm Terry Reedy wrote: [...] > In the absence of other information, I would presume that none of the > other classes have a move() method. move() is implemented in the class qtcanvas.QCanvasItem I checked the pyqt sources and it is linked via sip to the C++ object file.

don't understand MRO

Hi, I have a subclassed PyQt class: class Node(object): def move(self, x,y): pass class CRhomb(QCanvasPolygon, Node): pass $ python v2.4.1 >>> CRhomb.mro() [, , , , , , , ] >>> a = CRhomb() >>> a.move(1,2) This executes also Node.move(a, 1,2) Why? Because even QCanvasItem.move deleg

AM_PATH_PYTHON - version problem

Hi, I use the GNU autotools for packaging my python applications. My problem is that as I have both python2.3 and python2.4 installed the automake macros always detects the newest version and sets it path variables accordingly. How can I package the program for different versions of Python? (i.

Re: anonymous function objects?

Friday 29 April 2005 05:40 am Michele Simionato wrote: > Uwe Mayer: >> Why does the "print" statement return a syntax error here? > > Google for "Python regrets" where Guido admits that > 'print' should have been a function. :) Will this c

Re: anonymous function objects?

Friday 29 April 2005 00:06 am Paul Rubin wrote: > Closest you can come is: > >f = lambda: sys.stdout.write("hello world\n") Ah. :)) Why does the "print" statement return a syntax error here? >>> lambda: print("hallo") File "", line 1 lambda: print("hallo") ^ SyntaxErro

anonymous function objects?

Is it possible to specify anonymous functions, something like: >>> f = {print "hello world"} >>> f() hello world in Pyton? Lambda expressions don't work here. Thanks, Uwe -- http://mail.python.org/mailman/listinfo/python-list

sscanf needed

Hi, I've got a ISO 8601 formatted date-time string which I need to read into a datetime object. Is there a shorter way than using regular expressions? Is there a sscanf function as in C? Thanks, Uwe -- http://mail.python.org/mailman/listinfo/python-list

Re: singleton objects with decorators

Tuesday 12 April 2005 18:51 pm Michele Simionato wrote: > Uhm? If I pass different parameters I want to have > different instances. The Singleton behaviour is recovered > only when I pass always the same arguments, in > particular when I pass 0-arguments: > class Foobar: > ... __metaclas

Re: singleton objects with decorators

Tuesday 12 April 2005 17:00 pm Michele Simionato wrote: > I did not put memoize on __new__. I put it on the metaclass __call__. > Here is my memoize: > > def memoize(func): > memoize_dic = {} > def wrapped_func(*args): > if args in memoize_dic: > return memoize_di

Re: singleton objects with decorators

Tuesday 12 April 2005 17:00 pm Michele Simionato wrote: > I did not put memoize on __new__. I put it on the metaclass __call__. > Here is my memoize: [...] Clever, thanks! :) Ciao Uwe -- http://mail.python.org/mailman/listinfo/python-list

Re: singleton objects with decorators

Tuesday 12 April 2005 14:51 pm Michele Simionato wrote: > No. Not everybody knows about Singleton. It is an acquired knowledge. Well, what isn't? What I ment to say, but failed to do so more explicitly, was that it is a term I felt which was generally known to "the programming society". Or that

Re: singleton objects with decorators

Tuesday 12 April 2005 12:09 pm Michele Simionato wrote: > Steven Bethard: >> It strikes me that I've never wanted or needed a singleton object. >> Would you mind sharing your use case? I'm just curious. > > "Singleton" is the most idiotic pattern ever. If you want an instance, > just > instantia

Re: singleton objects with decorators

Tuesday 12 April 2005 10:01 am Steven Bethard wrote: >> I am using a class to manage configuration settings in an application. >> This object should only existe once so that when the user >> changes a setting through a configuration dialog the change imminent in >> all locations where access to con

Re: singleton objects with decorators

Tuesday 12 April 2005 06:36 am Steven Bethard wrote: > Uwe Mayer wrote: >> I've been looking into ways of creating singleton objects. > > It strikes me that I've never wanted or needed a singleton object. > Would you mind sharing your use case? I'm just curio

singleton objects with decorators

Hi, I've been looking into ways of creating singleton objects. With Python2.3 I usually used a module-level variable and a factory function to implement singleton objects. With Python2.4 I was looking into decorators. The examples from PEP 318 http://www.python.org/peps/pep-0318.html#examples do

unknown encoding problem

Hi, I need to read in a text file which seems to be stored in some unknown encoding. Opening and reading the files content returns: >>> f.read() '\x00 \x00 \x00<\x00l\x00o\x00g\x00E\x00n\x00t\x00r\x00y\x00... Each character has a \x00 prepended to it. I suspect its some kind of unicode - how do

changing from python2.3 to python2.4

I've written a little application which uses the bang-line #!/usr/bin/python to call the interpreter. As python 2.4 comes distributed with other distroes this breaks my application as its modules are installed in /usr/local/lib/python2.3/site-packages/... and python2.4 does not look there. How d

high resolution time needed

Hi, I need a function returning a time value with a higher resolution that the standard 1sec unix timestamp. I found the clock() function in the time module, but that seems to return the same value (in the Python shell) each time I call it (Debian Linux speaking here). Any ideas? Thanks, Uwe -

Re: example needed: sip + Qt

Saturday 29 January 2005 00:23 am Phil Thompson wrote: > So have you created the library you are trying to wrap? The documentation > is describing how to wrap a library and describes a fictional library as > the basis for the example. No, the extracts from before are from the code example of the

Re: example needed: sip + Qt

Friday 28 January 2005 23:39 pm Uwe Mayer wrote: > Friday 28 January 2005 23:18 pm Uwe Mayer wrote: >> Traceback (most recent call last): >> File "", line 1, in ? >> ImportError: ./hello.so: undefined symbol: _ZTV5Hello >> >> $ c++filt _ZTV5Hello >

Re: example needed: sip + Qt

Friday 28 January 2005 23:18 pm Uwe Mayer wrote: > Traceback (most recent call last): > File "", line 1, in ? > ImportError: ./hello.so: undefined symbol: _ZTV5Hello > > $ c++filt _ZTV5Hello > vtable for Hello > > The compilation did not give any warnings or

Re: example needed: sip + Qt

On Friday 28 January 2005 14:24 pm, Craig Ringer wrote: > Out of curiosity, would this be for an extension module used in an > embedded Python interpreter, or for plain extension module for use with > a standalone interpreter? I am writing an application program using Python and PyQt: https://sava

Re: example needed: sip + Qt

On Friday 28 January 2005 14:47 pm, Phil Thompson wrote: > > The QLabel example in the SIP reference manual yields syntax errors for > > me. > > What syntax errors? If there is a documentation bug then I'll fix it. I'll come to that a little later, that happened in the simple c++ word example.

example needed: sip + Qt

Hi, can someone provide me with a running example for subclassing QWidget (or something similarly simple) in C++ and then creating SIP (4.x+) bindings for in for Python (2.3+)? I am looking for something I can start of with and work my way towards more complicated stuff (with Qt). The QLabel ex

Re: make install with python

Friday 21 January 2005 20:47 pm Reinhold Birkenfeld wrote: [...] > The regular way is to use distutils and a setup.py file (google for > documentation). Ok, thanks. The document described just what I was looking for. Any suggestions how I handle

make install with python

Hi, I am writing a Python application and use the GNU auto-tools to compile what needs compilation (i.e. Qt's .ui files). However, I don't know how to write an automake file that installs the main file (lmc.py) and some library files (i.e. ClassA.py, ClassB.py) into the appropriate directories.

accessing class variables of private classes

Hi, I need to access class variables of a class I'd like to make private: i.e. class __Bar(object): pass class __Foo(__Bar): def __init__(self): super(__Foo, self).__init__() >>> __Foo() Name Error: global name '_Foo__Foo' is not defined Here I want to prevent the user of instanciating

deleting from tarfile

Hi, is it possible to delete a file from a tar-archive using the tarfile module? Thanks Uwe -- http://mail.python.org/mailman/listinfo/python-list

missing sys.setappdefaultencoding

Hi, well, I wrote a nice python program which won't work if the default encoding has not been set from ascii to latin-1 or latin-15. However, the command sys.setappdefaultencoding is missing on a Python installation with Python 2.3.4 on Gentoo where it is present on Debian. Any ideas how to deal

Re: UserDict deprecated

Saturday 01 January 2005 23:34 pm Steven Bethard wrote: [...] > If you implemented the file interface functions yourself, why do you > want to inherit from file? [...] > But just inheriting from list won't make this work, will it? Don't you > want to do something like: [...] Right. I guess th

Re: UserDict deprecated

Saturday 01 January 2005 22:48 pm Hans Nowak wrote: > Uwe Mayer wrote: > >> Why is the UserDict module is deprecated after Python 2.2. The >> application of it I have in mind is, i.e. multiple inheritance from >> "file" and "dic" - which is not possib

UserDict deprecated

Hi, Why is the UserDict module is deprecated after Python 2.2. The application of it I have in mind is, i.e. multiple inheritance from "file" and "dic" - which is not possible. If I used UserDict I would not need to specify all methods UserDict provides alreay, anyway. Ciao Uwe -- http://mail.

emulating python shell

Hi, in an application I want to provide direct access to the python interpreter of the running program. I use rawinput() and exec() to read an input string and a self-made function to check wether the inputed block is closed and then execute it. When running python interactively the result of the

subclassing list

Hi, I want to subclass "list". The documentation states to prefer subclassing list instead of UserList. How to you clear the contents of a list subclass without creating a new object? Thanks in advance Uwe -- http://mail.python.org/mailman/listinfo/python-list

non blocking read()

Hi, I use select() to wait for a file object (stdin) to become readable. In that situation I wanted to read everything available from stdin and return to the select statement to wait for more. However, the file object's read method blocks if the number of bytes is 0 or negative. Is there no way