Removes the **groupName** from the Groups and returns the list of
        group members. If no group is found, **default** is returned.
        **groupName** is a :ref:`type-string`. This must return either
        **default** or a :ref:`type-immutable-list` of glyph names as
        :ref:`type-string`.

            >>> font.groups.pop("myGroup")
            ("A", "B", "C")

def pop(self, groupName, default=None):
        """
        Removes the **groupName** from the Groups and returns the list of
        group members. If no group is found, **default** is returned.
        **groupName** is a :ref:`type-string`. This must return either
        **default** or a :ref:`type-immutable-list` of glyph names as
        :ref:`type-string`.

            >>> font.groups.pop("myGroup")
            ("A", "B", "C")
        """
        return super(BaseGroups, self).pop(groupName, default)