Библиотека Python разработчика | Книги по питону | United States America (US)

Create: 2025-06-02 Update: 2025-07-06 00:05:43

PEP 424 позволяет генераторам и другим итерируемым объектам, у которых нет заранее определённого точного размера, предоставлять «подсказку» о длине. Например, следующий генератор, скорее всего, вернёт примерно 50 элементов:


(x for x in range(100) if random() > 0.5)

Если вы пишете свой итерируемый объект и хотите добавить такую подсказку, определите метод __length_hint__. Если же длина известна точно, лучше использовать len.

Если вы используете итерируемый объект и хотите узнать его ожидаемую длину, применяйте функцию operator.length_hint.

👉@BookPython

Библиотека Python разработчика | Книги по питону


(x for x in range(100) if random() > 0.5)

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Библиотека Python разработчика | Книги по питону

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PEP 424 позволяет генераторам и другим итерируемым объектам

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