[issue23493] optimize sort_keys in json module by using operator.itemgetter()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

May be there is a time to optimize creating Python frames (at least for the 
case when one frame is created and destroyed multiple times). May be frame 
pool? Or cached one frame per function?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23493>
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