Serhiy Storchaka added the comment:

Hmm. I were going to use this method for re's named group (see issue14462). 
There is a possibility that some third-party code uses it for checking on 
general Unicode-aware identifiers. The language specifification says that 
keywords is a subset of identifiers. However in most places in stdlib 
(collections.namedtuple, unittest.mock, inspect.Parameter) 
is_usable_identifier() should be used instead of isidentifier().

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17447>
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