[issue19385] dbm.dumb should be consistent when the database is closed

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

There is no need to speed up methods which do IO (__getitem__, __setitem__, __delitem__). However method which works only with an index (keys, iterkeys, __contains__, __len__) can be optimized. In the __contains__ method an exception can be raised not only by nen-existent __contains__ of None, but from __hash__ or __eq__ methods of a key, so we should distinguish these cases.

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stage: resolved -> patch review
versions: +Python 3.4
Added file: http://bugs.python.org/file35348/issue19385_speed_2.patch

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