now that nobody is likely to use Python on Mac OS 9 and most of the (Mac) platform
items are all OS X special API specific since OS X is unixy enough for these modules
to be available out of the box.
Add support for the iterator and mapping protocols.
For Py2.3, this was done for shelve, dumbdbm and other mapping objects, but
not for bsddb and dbhash which were inadvertently missed.
Gregory P. Smith
Raymond Hettinger
Thomas Wouters
Martin v. Löwis
Fred Drake