Mailman 3 November 2003 - Python-Dev

copy() and deepcopy()
by Raymond Hettinger Nov. 22, 2003

Nov. 22, 2003

I would like to confirm my understanding of copying and its implications. A shallow copy builds only a new outer shell and leaves the inner references unchanged. If the outer object is immutable, then a copy might as well be the original object. So, in the copy module, the copy function for tuples should just return the original object (the function looks like it does more but actually does return itself). And, since a frozenset is immutable, its copy function should also just return self. … [View More]

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How Python is Developed essay (final rough draft)
by Brett C. Nov. 22, 2003

Nov. 22, 2003

OK, since I want to have this thing finished and online (plus I need this finished for submitting to PyCon) I am making this the final rough draft. This means this is last call on corrections and changes before it hopefully makes its public debut (up to pydotorg and whether anyone objects to me putting it up on python.org/dev/ ). Respond with any comment, corrections, etc. And the sooner the better since I am hoping to get it up some time next week. ---------------------------- … [View More]

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Help
by Avneet Mathur Nov. 22, 2003

Nov. 22, 2003

Hi group, I have been given a problem and as I am novice in Python, I am asking for the help of you experts. I am supposed to read in a file, search for in the opened file an expression like this from a list of similar expressions and print out Hello world. {(inp:han) <Hello World!> } Thus the expression in <> after (inp:han) has to be printed out. Please help! Is there any way to output this to the browser! Thanks a lot in advance. Avneet Mathur

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test_re failures, Windows, 2.3 maint
by Tim Peters Nov. 21, 2003

Nov. 21, 2003

I sent test_re output from Windows on 2.3 maint yesterday. Two tests fail with "maximum recursion limit exceeded". Why do we expect them not to fail? 32-bit Windows may be unique in using this check: #if defined(USE_STACKCHECK) if (level % 10 == 0 && PyOS_CheckStack()) return SRE_ERROR_RECURSION_LIMIT; #endif PyOS_CheckStack() there isn't guessing, it's using Windows-specific facilities to check directly whether the C stack is about to overflow. In test_bug_418626, … [View More]

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Re: [Python-checkins] python/dist/src/Lib codeop.py, 1.7, 1.8
by Michael Hudson Nov. 20, 2003

Nov. 20, 2003

doerwalter(a)users.sourceforge.net writes: > Update of /cvsroot/python/python/dist/src/Lib > In directory sc8-pr-cvs1:/tmp/cvs-serv29941/Lib > > Modified Files: > codeop.py > Log Message: > Fix typos. Uh, no. > This module provides two interfaces, broadly similar to the builtin ^^^^^^^^^^^^^^ > ! function compile(), that take progam text, a filename and a 'mode' ^^^^ perhaps this should be which... Cheers, mwh … [View More]

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more on pickling
by Christian Tismer Nov. 19, 2003

Nov. 19, 2003

Hi again, trying to pickle bound python methods, I'm now running into another problem. It seems to give a problem when asking for an attribute of a bound method: >>> class a: ... def x(self): pass >>> a.x # good so far <unbound method a.x> >>> a().x # very good <bound method a.x of <__main__.a instance at 0x007A6CE8>> >>> a.x.__reduce__ # naaaaah? Sounds bad <built-in method __reduce__ of … [View More]

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airspeed of an unladen swallow
by Tommy Burnette Nov. 19, 2003

Nov. 19, 2003

in case this hasn't been seen on the regular python list yet.... http://www.style.org/unladenswallow

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2.2=>2.3 object.__setattr__(cls,attr,value)
by David Eppstein Nov. 18, 2003

Nov. 18, 2003

In 2.2 I was able to call object.__setattr__(cls,attr,value) where cls is a new-style type (first argument of a classmethod), and attr and value are the name and value of a class attribute I want to create programmatically. I just upgraded to 2.3 but now when I try it I get >>> class foo(object):pass ... >>> object.__setattr__(foo,'foo',None) Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: can't apply this __setattr__ to type object … [View More]

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__reversed__ protocol
by Raymond Hettinger Nov. 18, 2003

Nov. 18, 2003

At one point, PEP 322 had proposed checking to see if an object defined __reversed__ and if not available, then proceeding normally using __getitem__ and __len__. While the idea had supporters, it got taken out because Guido worried that it would be abused by being applied to general iterables like generators and objects returned by itertools. So, an improved version of the idea is to check for __reversed__ but only use it when the object also defines __len__. That precludes the abuses but … [View More]

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generator/microthread syntax
by Wade Brainerd Nov. 18, 2003

Nov. 18, 2003

Hello, I'm working on a game engine using Python as the scripting language and have a question about generators. I'm using what I guess are called 'microthreads' as my basic script building block, and I'd like to know if there is some kind of syntax that could make them clearer, either something in Python already or something that could be added. Here's an example script that illustrates the problem. from jthe import * def darlene_ai(self): while True: for x in … [View More]

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