[issue1283110] Give __len__() advice for "don't know"

[Todd Rovito]

Todd Rovito added the comment:

New patch with a better reference to the source for the test case.  This was suggested by PythonMentors list.  I think the patch improves the documentation.  This works on Python 3.4.

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Added file: http://bugs.python.org/file27605/DataModel__len__.patch

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