def lower_items(self):
    'Like iteritems(), but with all lowercase keys.'
    return ((lowerkey, keyval[1]) for (lowerkey, keyval) in self._store.items())
Like iteritems(), but with all lowercase keys.
def lower_items(self):
    
    return ((lowerkey, keyval[1]) for (lowerkey, keyval) in self._store.items())