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Пишешь if not in?

YouTubeSimple Python

Пишешь if not in?

Проверяешь, есть ли ключ, перед каждой записью в словарь? Лишний код. setdefault вставит значение, если ключа нет, и вернёт старое, если есть. Для группировки — пустой список и сразу append. Никаких if ...

85 views1 week ago

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