[issue11610] Improved support for abstract base classes with descriptors

[Darren Dale]

Darren Dale <dsdale24 at gmail.com> added the comment:

Here is attempt #4. This patch extends the property, classmethod and staticmethod builtins with an __isabstractmethod__ descriptor. Docs and tests are updated as well. "make test" runs without failures. This is my first real attempt with the C-API, and I think I am finally over the learning curve, but comments would be greatly appreciated.

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Added file: http://bugs.python.org/file22407/abc_descriptor.patch

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