code: def eth_getUncleByBlockHashAndIndex(self, bhash, index=0):
          
          result = yield from self.rpc_call('eth_getUncleByBlockHashAndIndex',
                                            [bhash, hex(index)])
          # TODO: Update result response
          return result
docs: https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getunclebyblockhashandindex
  
          :param bhash: Block hash
          :type bhash: str
  
          :param index: Index position (optional)
          :type index: int
  
          :return: block
          :rtype: dict or None