code: def get_block_hash_by_height(self, height: int, is_full: bool = False) -> str:
          
          payload = self.generate_json_rpc_payload(RpcMethod.GET_BLOCK_HASH, [height, 1])
          response = self.__post(self.__url, payload)
          if is_full:
              return response
          return response['result']
docs: This interface is used to get the hexadecimal hash value of specified block height in current network.
  
          :param height: a decimal block height value.
          :param is_full:
          :return: the hexadecimal hash value of the specified block height.