[issue28847] dumbdbm should not commit if in read mode

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0516f54491cb by Serhiy Storchaka in branch '2.7':
Issue #28847: dubmdbm no longer writes the index file in when it is not
https://hg.python.org/cpython/rev/0516f54491cb

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nosy: +python-dev

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<http://bugs.python.org/issue28847>
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