[issue18181] PEP447: Add type.__getdescriptor__

[Ronald Oussoren]

Ronald Oussoren added the comment:

The attached micro benchmark indicates that method_cache in typeobject.c isn't used when using my patch. I'll have too look into that.

Other than that benchmarks results look OK (but: not using the method_cache is unacceptable as this most definitely changes performance).

What is kind of scary, but is to be expected I guess, is that a __getdescriptor__ method in Python is awfully slow.  I have to look into why this is slow, as the slowdown for using Python is significantly worse than I expected.

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Added file: http://bugs.python.org/file40013/pep447-micro-bench.py

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