code: def lookup(self, project_id, keys, read_options=None):
          
          request_pb = _datastore_pb2.LookupRequest(
              project_id=project_id, read_options=read_options, keys=keys
          )
          return _rpc(
              self.client._http,
              project_id,
              "lookup",
              self.client._base_url,
              request_pb,
              _datastore_pb2.LookupResponse,
          )
docs: Perform a ``lookup`` request.
  
          :type project_id: str
          :param project_id: The project to connect to. This is
                             usually your project name in the cloud console.
  
          :type keys: List[.entity_pb2.Key]
          :param keys: The keys to retrieve from the datastore.
  
          :type read_options: :class:`.datastore_pb2.ReadOptions`
          :param read_options: (Optional) The options for this lookup. Contains
                               either the transaction for the read or
                               ``STRONG`` or ``EVENTUAL`` read consistency.
  
          :rtype: :class:`.datastore_pb2.LookupResponse`
          :returns: The returned protobuf response object.