def fill_into_dict(self, items, dest):
        """
        Take an iterable of `items` and group it into the given `dest` dict,
        using the :attr:`key` function.

        The `dest` dict must either already contain the keys which are
        generated by the :attr:`key` function for the items in `items`, or must
        default them suitably. The values of the affected keys must be
        sequences or objects with an :meth:`append` method which does what you
        want it to do.
        """
        for item in items:
            dest[self.key(item)].append(item)
def fill_into_dict ( self , items , dest ) : for item in items : dest [ self . key ( item ) ] . append ( item )
Take an iterable of `items` and group it into the given `dest` dict,
        using the :attr:`key` function.

        The `dest` dict must either already contain the keys which are
        generated by the :attr:`key` function for the items in `items`, or must
        default them suitably. The values of the affected keys must be
        sequences or objects with an :meth:`append` method which does what you
        want it to do.