Serhiy Storchaka added the comment:

I forgot about this issue and proposed similar patch for issue25168. It doesn't 
recalculate timezone values (a tuple of frozensets) on every _strptime call, 
but uses cheaper tests for time.tzname and time.daylight.

issue6478_v3.diff has a bug, it doesn't clear _regex_cache after changing 
_TimeRE_cache. And I doubt that after fixing this the benefit of not recreating 
the entire _TimeRE_cache will be worth the complication of the code.

Looks as this bug is a cause of random order depending tests failure 
(issue22067).

----------
stage: needs patch -> patch review
versions: +Python 3.5, Python 3.6 -Python 3.3
Added file: http://bugs.python.org/file41134/strptime_cache_timezone.patch

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<http://bugs.python.org/issue6478>
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