code: def removeSubscriber(self, email):
          
  
          headers, raw_data = self._perform_subscribe()
          missing_flag, raw_data = self._remove_subscriber(email, raw_data)
          if missing_flag:
              return
  
          self._update_subscribe(headers, raw_data)
          self.log.info("Successfully remove a subscriber: %s for <Workitem %s>",
                        email, self)
docs: Remove a subscriber from this workitem
  
          If the subscriber has not been added, no more actions will be
          performed.
  
          :param email: the subscriber's email