[issue21729] Use `with` statement in dbm.dumb

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thanks Claudiu.

Committed with yet one "with".

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resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21729>
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