[issue30962] Add caching to logging.Logger.isEnabledFor()

[Avram]

Avram added the comment:

Yes, though the bottleneck for normal logging is more likely in other areas so the speedup will be less noticeable. Where I notice it is with debug statements when debugging is disabled. In that scenario the bulk of the time is spent checking if the level is enabled anywhere in the ancestry.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30962>
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