Mailman 3 November 2003 - Python-Dev

Removing operator.isMappingType
by Raymond Hettinger Nov. 18, 2003

Nov. 18, 2003

My previous posting on this didn't get resolved. This issue is that the function doesn't work: >>> map(operator.isMappingType, ['', u'', (), [], {}]) [True, True, True, True, True] If someone thinks this should not be removed, please speak up. Raymond Hettinger

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Provoking Jim's MRO segfault before shutdown
by Tim Peters Nov. 18, 2003

Nov. 18, 2003

The following program provokes a segfault before shutdown in a release build, or, in a debug build, triggers Assertion failed: mro != NULL, file C:\Code\python\Objects\object.c, line 1225 This is on current 2.4 trunk, so includes the fix checked in on Wednesday for "Thomas Heller's bug". In the "it figures" department: I was never able to provoke Jim's problem on purpose. I was trying to provoke a different failure here, and never got to the point of … [View More]

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_Py_RefTotal wrong in Py 2.2.3
by Christian Tismer Nov. 17, 2003

Nov. 17, 2003

Hi friends, over the weekend, I hacked quite a lot on Stackless with Python 2.2.3, in order to get rid of refcounting problems with thread pickling. It tuned out that code objects created wrong refcounts when unpickling them. I debuged this down to the very end, until I was sure my stuff is doing it right. Then I added a small function that recomputes the actual total refcounts from the chained list of all objects, and it turned out to be correct (and also my pickling), but _Py_RefTotal is … [View More]

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RE: [Python-Dev] Small bug -- direct check-in allowed?
by Raymond Hettinger Nov. 17, 2003

Nov. 17, 2003

> >>> "Raymond Hettinger" wrote > > I think that adds an unnecessary level of indirection. SF helps when it > > comes to tracking, public discussion, patch evolution, the approval > > process, etc. However, for direct fixes, I think the check-in message > > is sufficient. > > I disagree - if I hit a bug and want to see if it's fixed, often the > entry in Misc/NEWS is far too brief to be useful. Not everyone has a > CVS checkout of Python that … [View More]

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Re: [Python-checkins] python/dist/src/Lib modulefinder.py, 1.7, 1.8
by Guido van Rossum Nov. 17, 2003

Nov. 17, 2003

> Index: modulefinder.py > =================================================================== > RCS file: /cvsroot/python/python/dist/src/Lib/modulefinder.py,v > retrieving revision 1.7 > retrieving revision 1.8 > diff -C2 -d -r1.7 -r1.8 > *** modulefinder.py 18 Jul 2003 15:31:40 -0000 1.7 > --- modulefinder.py 14 Nov 2003 10:28:42 -0000 1.8 > *************** > *** 211,215 **** > return > modules = {} > ! suffixes = [".py", … [View More]

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Variable Scope
by RN Nov. 17, 2003

Nov. 17, 2003

I have a 2 Python scripts that contain the following lines: test.py ------- from testmod import * a1 = 10 modfunc() testmod.py ----------- def modfunc(): print a1 When I run test.py, it returns the following error: File "testmod.py", line 2, in modfunc print a1 NameError: global name 'a1' is not defined My intent is to make a1 a global variable - so that I can access its value in all functions of imported modules. What should I do? Thanks in advance, Rohit

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sqlite into std library for 2.4?
by Anthony Baxter Nov. 16, 2003

Nov. 16, 2003

I'd like to suggest we include sqlite in the standard library for 2.4. It's maintained, is a full-featured SQL database with a very small footprint and very little needed in the way of dead chickens to get it up and running. Anyone else? Anthony

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set() and frozenset()
by Raymond Hettinger Nov. 16, 2003

Nov. 16, 2003

The C implementation of sets is now ready for your experimentation and comment. If fulfills most of Greg's proposal at: http://www.python.org/peps/pep-0218.html The files are at: nondist\sandbox\setobj Build it with: python setup.py build -g install Test it with: python_d test_set.py The differences from sets.py are: . The containers are now named set() and frozenset(). The lowercase convention is used to make the names consistent with other builtins like list() and dict(). User … [View More]feedback said that the name ImmutableSet was unwieldy (?sp), so frozenset() was chosen as a more succinct alternative. . There is no set.update() method because that duplicated set.union_update(). . There is no automatic conversion from the mutable type to the non-mutable type. User feedback revealed that this was never needed. Also, removing it simplified the code considerably. The result is more straight-forward and a lot less magical. David Eppstein provided code examples demonstrating that set() and frozenset() are just right for implementing common graph algorithms and NFA/DFAs. . The __deepcopy__() method will be implemented in copy.py instead of setmodule.c. This is consistent with other builtin containers and keeps all the deepcopying knowledge in one place. Also, the code is much simpler in pure python and I wanted avoid importing the copy module inside setobject.c. . The __getstate__() and __setstate__() methods were replaced by __reduce__(). Pickle sizes were made much smaller by saving just the keys instead of key:True pairs. . There is no equivalent of BaseSet. This saves adding another builtin and it is not a burden to write isinstance(s, (set, frozenset)). The difference from PEP 218 is: . There is not a special syntax for constructing sets. Once generator expressions are implemented, special notations become superfluous. It is simple enough to write: s = set(iterable). Though the implementation is basically done and ready for you guys to experiment with, I still have a few open items: . Expand the unittests to include all of the applicable tests from the existing test_sets.py . Refactor the error exits to use goto and XDECREF. . Do one more detailed (line-by-line review). . Write the docs. . Recast the extension module to be a builtin object. . Note, the original sets.py will be left unchanged so that code written for it will continue to run without modification. For those interested in speed and pickle size, it is simple enough to search-and-replace "sets.Set" with "set". Raymond Hettinger [View Less]

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Re: [Python-checkins] python/dist/src/Doc/lib libfuncs.tex,1.151,1.152
by Barry Warsaw Nov. 16, 2003

Nov. 16, 2003

On Sun, 2003-11-16 at 11:17, rhettinger(a)users.sourceforge.net wrote: > Update of /cvsroot/python/python/dist/src/Doc/lib > In directory sc8-pr-cvs1:/tmp/cvs-serv13946/Doc/lib > > Modified Files: > libfuncs.tex > Log Message: > * Migrate set() and frozenset() from the sandbox. > * Install the unittests, docs, newsitem, include file, and makefile update. > * Exercise the new functions whereever sets.py was being used. > > Includes the docs for libfuncs.tex. … [View More]

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Weekly Python Bug/Patch Summary
by Skip Montanaro Nov. 16, 2003

Nov. 16, 2003

Bug/Patch Summary ----------------- 580 open / 4343 total bugs (+68) 196 open / 2455 total patches (+19) New Bugs -------- Typos in the docs (Extending/Embedding + Python/C API) (2003-11-09) http://python.org/sf/838938 Document that highly recursive data cannot be pickled (2003-11-09) http://python.org/sf/839075 attempt to access sys.argv when it doesn't exist (2003-11-10) http://python.org/sf/839151 interators broken for weak dicts (2003-11-10) http://python.org/sf/839159 … [View More]

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