Dictionaries
Упорядоченные или нет?
До Python 3.7 - неупорядоченные
С Python 3.7 - упорядоченные
Better to use ordered dictionaries in collections
Ограничения:
Ключи только хешируемые, если встроенный тип - immutable
BY Python. Собеседование. Книги.
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