[issue22766] collections.Counter's in-place operators should return NotImplemented for unsupported types

[Raymond Hettinger]

Raymond Hettinger added the comment:

Note, the += operation is conceptually similar to update() methods with are 
usually duck typeable:

>>> d = {}
>>> d.update(1)
Traceback (most recent call last):
  File "<pyshell#16>", line 1, in <module>
    d.update(1)
TypeError: 'int' object is not iterable

>>> s = set()
>>> s.update(1)
Traceback (most recent call last):
  File "<pyshell#18>", line 1, in <module>
    s.update(1)
TypeError: 'int' object is not iterable

>>> dict(1)
Traceback (most recent call last):
  File "<pyshell#19>", line 1, in <module>
    dict(1)
TypeError: 'int' object is not iterable

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<http://bugs.python.org/issue22766>
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