def update ( self , other_dict ) : for key , value in iter_multi_items ( other_dict ) : MultiDict . add ( self , key , value )
python dict update one dict without changing other
update () extends rather than replaces existing key lists .
def update(self, other_dict):
        """update() extends rather than replaces existing key lists."""
        for key, value in iter_multi_items(other_dict):
            MultiDict.add(self, key, value)