クラス内のProcessPoolExecutorにselfを渡してはいけない - Qiita

import concurrent import concurrent.futures class Process: def __init__(self): self.process_list = [] self.executor = concurrent.futures.ProcessPoolExecutor(max_workers=4) # self.executor = concurrent.futures.ThreadPoolExecutor(max_workers=4) # スレッド処理なら動く def _process(self, n): # 処理部 return 1 def start_process(self, n): # 実行部 self.process_list.append(self.executor.submit(self._process, n)) def get