subprocess.run ではなく、もっと細かい制御が必要な場合は subprocess.Popen を使う。 例えば、非同期でプロセスを実行し、後からプロセスの状態を確認したり、プロセスを停止したりできます。

タイトルの通りですが、subprocess.Popenの返り値の型アノテーションがわからず、いろいろ調べてしまってやたら時間がかかってしまったので、メモがてら残しておきます。

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