[issue26282] Add support for partial keyword arguments in extension functions

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

On new patch applied Martin's suggestions, added entities in What's New and NEWS, added a reference to the glossary, and improved error message.

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Added file: http://bugs.python.org/file42779/pyarg_parse_positional_only_and_keywords_3.patch

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<http://bugs.python.org/issue26282>
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