code: def arbiter(**params):
      '''Obtain the ``arbiter``.
  
      It returns the arbiter instance only if we are on the arbiter
      context domain, otherwise it returns nothing.
      '''
      arbiter = get_actor()
      if arbiter is None:
          # Create the arbiter
          return set_actor(_spawn_actor('arbiter', None, **params))
      elif arbiter.is_arbiter():
          return arbitef arbiter(**params):
      '''Obtain the ``arbiter``.
  
      It returns the arbiter instance only if we are on the arbiter
      context domain, otherwise it returns nothing.
      '''
      arbiter = get_actor()
      if arbiter is None:
          # Create the arbiter
          return set_actor(_spawn_actor('arbiter', None, **params))
      elif arbiter.is_arbiter():
          return arbiter
docs: Obtain the ``arbiter``.
  
      It returns the arbiter instance only if we are on the arbiter
      context domain, otherwise it returns nothing.