[issue11491] dbm.open(..., flag="n") raises dbm.error if file exists and is rejected by whichdb

[Brian Curtin]

Brian Curtin <brian at python.org> added the comment:

Attached is a slightly updated version of the patch. If the assertEqual for any reason were to fail, the file wouldn't be closed, leading to a ResourceWarning. That'll work on 3.2+, but if this is backported consideration will have to be made there (try/finally, probably).

Otherwise, in concept I think this patch is alright.

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Added file: http://bugs.python.org/file21123/issue11491.diff

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