[issue5736] Add the iterator protocol to dbm modules

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

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

I agree with Skip that using a static variable is not appropriate. The
proper solution probably would be to define a separate gdbm_iter object
which always preserves the last key returned.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5736>
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