code: def work_cancel(self, hash):
          
  
          hash = self._process_value(hash, 'block')
  
          payload = {"hash": hash}
  
          resp = self.call('work_cancel', payload)
          return resp == {}
docs: Stop generating **work** for block
  
          .. enable_control required
  
          :param hash: Hash to stop generating work for
          :type hash: str
  
          :raises: :py:exc:`nano.rpc.RPCException`
  
          >>> rpc.work_cancel(
          ...     hash="718CC2121C3E641059BC1C2CFC45666C99E8AE922F7A807B7D07B62C995D79E2"
          ... )
          True