code: def run_actor(self, actor):
          '''Start running the ``actor``.
          '''
          set_actor(actor)
          if not actor.mailbox.address:
              address = ('127.0.0.1', 0)
              actor._loop.create_task(
                  actor.mailbox.start_serving(address=address)
              )
          actor._loop.run_forever(f run_actor(self, actor):
          '''Start running the ``actor``.
          '''
          set_actor(actor)
          if not actor.mailbox.address:
              address = ('127.0.0.1', 0)
              actor._loop.create_task(
                  actor.mailbox.start_serving(address=address)
              )
          actor._loop.run_forever()
docs: Start running the ``actor``.