"self.dict.close()" and ignore the exception.  The "if self.dict:"
part would be calculated through len(self.dict.keys()), which is very
expensive for a large dictionary...

being destroyed already.

attribute, this method silently ignores this fact.  The default (bsddb's dbhash) does.

pickle.py: new low-level persistency module (used to be called flatten)
dbmac.py: stupid dbm clone for the Mac
anydbm.py: generic dbm interface (should be extended to support gdbm)