[issue24454] Improve the usability of the match object named group API

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

./Modules/_sre.c:2425:14: warning: ‘match_getitem_doc’ defined but not used [-
Wunused-variable]

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24454>
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