[issue6045] Fix dbm interfaces

["Martin v. Löwis" <report@bugs.python.org> at psf.upfronthosting.co.za]

Martin v. Löwis <martin at v.loewis.de> added the comment:

> So, either we remove the claim that they have a dict-style interface
> beyond __*item__() and keys(), or we do something about it.

I disagree that this is release-critical. I think it is desirable to
say that the dbm modules support most of a dict-style interface,
and I also think that it is factually correct to claim that they
currently do.

The problem with the current documentation is that it apparently stopped
documenting the "dict-style interface", in the sense

http://www.python.org/doc/2.5/lib/typesmapping.html

did. Instead, the documentation now only documents the dict type itself.
If a dict-style interface was specified, one would have to specify
whether returning views from keys/values/items is part of the dict-style
interface or not.

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nosy: +loewis

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