code: def remove_outside_collaborator(self, collaborator):
          
          assert isinstance(collaborator, github.NamedUser.NamedUser), collaborator
          headers, data = self._requester.requestJsonAndCheck(
              "DELETE",
              self.url + "/outside_collaborators/" + collaborator._identity
          )
docs: :calls: `DELETE /orgs/:org/outside_collaborators/:username <https://developer.github.com/v3/orgs/outside_collaborators>`_
          :param collaborator: :class:`github.NamedUser.NamedUser`
          :rtype: None