How should I use the Optional type hint?

Python タイピング: オプションはオプションではありません! (中級) アンソニーが #146 を説明する

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mypy's "implicit optional" (and why I disable it) (intermediate) anthony explains #147

Python タイピング: re.match とオプション (中間) anthony が #115 を説明します

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Master Type Hinting using Union and Optional in under 60 Seconds! #datatypes #pythonprogramming #dev

PYTHON : How should I use the Optional type hint?

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