[issue28847] dumbdbm should not commit if in read mode

[Roundup Robot]

Roundup Robot added the comment:

New changeset dc7c86de9e13 by Martin Panter in branch '2.7':
Issue #28847: Fix spelling
https://hg.python.org/cpython/rev/dc7c86de9e13

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