[Python-3000] backported ABC

[Benjamin Aranguren]

We copied abc.py and test_abc.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, test_abc.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/)
>
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