code: def pop(self, groupName, default=None):
          
          return super(BaseGroups, self).pop(groupName, default)
docs: 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")