Python: ThreadPoolExecutor: マルチスレッド

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    def bind_all(self):
        def _bind(instance):
            instance.bind_to_debt()

        executor = ThreadPoolExecutor(max_workers=4)
        for i in self.all():
            executor.submit(_bind, i)

        executor.shutdown() # 全てのスレッドが終わるのを待つ