[issue19282] dbm.open should be a context manager

[Roundup Robot]

Roundup Robot added the comment:

New changeset 200207e50cbf by R David Murray in branch 'default':
whatsnew: dbm.open is context manager. (#19282)
http://hg.python.org/cpython/rev/200207e50cbf

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<http://bugs.python.org/issue19282>
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