[issue9731] Add ABCMeta.has_methods and tests that use it

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

+1 for the basic idea.

It could use a better name, Sequence.has_methods(range) reads backwards to me.  Perhaps something like:  Sequence.implemented_by(range) or Sequence.verify_full_api(range) or some such.

Also, when the tests get added, they should go in the test file for the implementing class (like test_range for example.)

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nosy: +rhettinger

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