[issue9523] Improve dbm modules

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

> I think the patch will not be suitable for 3.1 and 3.2

Yes, it changes some api(e.g keys()), which may introduces compatibility issues.

> so there should be a doc patch to mention the limitations of the dbm API (keys() > returning a list and all that).

Do you mean a doc patch for 3.2 which mentions the missing or imperfect methods of collections.MutableSequence()? e.g keys() not returns a KeysView but a list instead, update() is missing

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