code: def close(self):
      self.par_env.close()
  
imports: from typing import Optional
  import gymnasium
  from ray.rllib.env.multi_agent_env import MultiAgentEnv
  from ray.rllib.utils.annotations import PublicAPI
  from ray.rllib.utils.typing import MultiAgentDict
label_desc: Use image node_id 4 for calling the ParallelPettingZooEnv obj's underlying member method code with example usage: obj.close() without return types