if d is a dbm (gdbm, bsddb, shelve, etc.) object, then
"for k in d"
should iterate through the keys of d, like you can do
with dicts.  Alternatively, add a new operation,
d.xkeys(), which returns an iterator that steps through
all the keys in d.  d.keys() is often inappropriate
since dbm databases can be extremely large and d.keys()
tries to read all the keys into memory at once.

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* for Py2.3, all shelve now inherits from UserDict.DictMixin 
which adds in the missing methods for a dictionary style 
interface.

* the appropriate name for d.xkeys() is d.iterkeys().

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That's nice about shelve, but really, all the dbm classes
need this operation.

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I think this was taken case of for Python 2.3.  Please 
check to see if all of your needs have been met.  If so, 
please close the request.  If not, paste a patch (applying 
UserDict.DictMixin) for anything that was missed.

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bsddb and dbhash were missed for Py2.3.
Adding the to Py2.4.
See:
   Lib/bsddb/__init__.py 1.6
   Lib/test/test_bsddb.py 1.13