code: def update_image_member(self, img_id, status):
          
          if status not in ("pending", "accepted", "rejected"):
              raise exc.InvalidImageMemberStatus("The status value must be one "
                      "of 'accepted', 'rejected', or 'pending'. Received: '%s'" %
                      status)
          api = self.api
          project_id = api.identity.tenant_id
          uri = "/%s/%s/members/%s" % (self.uri_base, img_id, project_id)
          body = {"status": status}
          try:
              resp, resp_body = self.api.method_put(uri, body=body)
          except exc.NotFound as e:
              raise exc.InvalidImageMember("The update member request could not "
                      "be completed. No member request for that image was found.")
docs: Updates the image whose ID is given with the status specified. This
          must be called by the user whose project_id is in the members for the
          image. If called by the owner of the image, an InvalidImageMember
          exception will be raised.
  
          Valid values for 'status' include:
              pending
              accepted
              rejected
          Any other value will result in an InvalidImageMemberStatus exception
          being raised.