The Mapping ABC's __eq__ method should return NotImplemented if the other type is not a Mapping

http://bugs.python.org/issue8729

The Mapping ABC's __eq__ method should return NotImplemented if the other type is not a Mapping, to give the other type a chance at the comparison.  Right now it simply returns false.

The comparison methods on the other ABCs in _abcoll.py already return NotImplemented if they don't recognize the other type.

[Benjamin, 2010-05-20 22:51:37]

Looks mostly good.

http://codereview.appspot.com/1193044/diff/1/3
File Lib/test/test_collections.py (right):

http://codereview.appspot.com/1193044/diff/1/3#newcode253
Lib/test/test_collections.py:253: name = '__'+op+'__'
Space between the strings and +.

http://codereview.appspot.com/1193044/diff/1/3#newcode254
Lib/test/test_collections.py:254: operators['__'+op+'__'] = getattr(operator,
name)
Use the name variable again. (You could actually use a dict comp here.)

http://codereview.appspot.com/1193044/diff/1/3#newcode273
Lib/test/test_collections.py:273: if not hasattr(instance, name): continue
Put continue on another line.