[Python-3000] backported ABC (original) (raw)

Guido van Rossum guido at python.org
Tue Sep 4 05:30:41 CEST 2007

You're going to have to do some spelunking in the 3.0 source (because I don't have time right now :-), but I think 3.0 has some magic that solves this. I think it is done by not inheriting tp_hash unless tp_richcompare is also inherited. The details are probably in typeobject.c.

Ask me again tomorrow if you can't figure it out.

--Guido

On 9/3/07, Benjamin Aranguren <baranguren at gmail.com> wrote:

I am having a problem backporting collections.py/abcoll.py and would like to get your input.

There's one test in testcollections that fails. class TestOneTrickPonyABCs(unittest.TestCase): def testHashable(self): # Check some non-hashables nonsamples = [list(), set(), dict()] for x in nonsamples: self.failIf(isinstance(x, Hashable), repr(x)) self.failIf(issubclass(type(x), Hashable), repr(type(x))) The problem is list, set, dict all has hash function so isinstance and issubclass returns true even though none of list, set, and dict was registered as a subclass of Hashable. But, calling x.hash() on these types results to a TypeError: list objects are unhashable. Thanks! On 8/26/07, Benjamin Aranguren <baranguren at gmail.com> wrote: > I got it now. both modules need to be backported as well. I'm on it. > > On 8/26/07, Benjamin Aranguren <baranguren at gmail.com> wrote: > > No problem. Created issue 1026 in tracker with a single patch file attached. > > > > I'm not aware of what changes need to be done with abcoll.py and > > collections.py. If you can point me to the right direction, I would > > definitely like to work on it. > > > > On 8/26/07, Guido van Rossum <guido at python.org> wrote: > > > Thanks! > > > > > > Would it inconvenience you terribly to upload this all to the new > > > tracker (bugs.python.org)? Preferably as a single patch against the > > > svn trunk (to use svn diff, you have to svn add the new files first!) > > > > > > Also, are you planning to work on abcoll.py and the changes to collections.py? > > > > > > --Guido > > > > > > On 8/26/07, Benjamin Aranguren <baranguren at gmail.com> wrote: > > > > We copied abc.py and testabc.py from py3k svn and modified to work with 2.6. > > > > > > > > After making all the changes we ran all the tests to ensure that no > > > > other modules were affected. > > > > > > > > Attached are abc.py, testabc.py, and their relevant patches from 3.0 to 2.6. > > > > > > > > On 8/25/07, Guido van Rossum <guido at python.org> wrote: > > > > > Um, that patch contains only the C code for overloading isinstance() > > > > > and issubclass(). > > > > > > > > > > Did you do anything about abc.py and abcoll.py/collections.py and > > > > > their respective unit tests? Or what about the unit tests for > > > > > isinstance()/issubclass()? > > > > > > > > > > On 8/25/07, Benjamin Aranguren <baranguren at gmail.com> wrote: > > > > > > Worked with Alex Martelli at the Goolge Python Sprint. > > > > > > > > > > -- > > > > > --Guido van Rossum (home page: http://www.python.org/~guido/) > > > > > > > > > > > > > > > > > > > > > > -- > > > --Guido van Rossum (home page: http://www.python.org/~guido/) > > > > > >

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-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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