[issue17447] str.identifier shouldn't accept Python keywords

[Serhiy Storchaka]

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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<http://bugs.python.org/issue17447>
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