[issue28847] dumbdbm should not commit if in read mode

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0a74bc7ba462 by Serhiy Storchaka in branch '3.5':
Issue #28847: dbm.dumb now supports reading read-only files and no longer
https://hg.python.org/cpython/rev/0a74bc7ba462

New changeset 0c532bd28539 by Serhiy Storchaka in branch '3.6':
Issue #28847: dbm.dumb now supports reading read-only files and no longer
https://hg.python.org/cpython/rev/0c532bd28539

New changeset 2f59be67830c by Serhiy Storchaka in branch 'default':
Issue #28847: dbm.dumb now supports reading read-only files and no longer
https://hg.python.org/cpython/rev/2f59be67830c

New changeset a10361dfbf64 by Serhiy Storchaka in branch 'default':
Issue #28847: A deprecation warning is now emitted if the index file is missed
https://hg.python.org/cpython/rev/a10361dfbf64

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