code: def key(self, *path_args, **kwargs):
          
          if "project" in kwargs:
              raise TypeError("Cannot pass project")
          kwargs["project"] = self.project
          if "namespace" not in kwargs:
              kwargs["namespace"] = self.namespace
          return Key(*path_args, **kwargs)
docs: Proxy to :class:`google.cloud.datastore.key.Key`.
  
          Passes our ``project``.