Оператор in можно использовать с генераторами: x in g. Python будет итерировать g

Библиотека Python разработчика | Книги по питону

Оператор in можно использовать с генераторами: x in g. Python будет итерировать g, пока x не найдётся или генератор не исчерпается.


>>> def g():
...     print(1)
...     yield 1
...     print(2)
...     yield 2
...     print(3)
...     yield 3
...
>>> 2 in g()
1
2
True

Однако range() делает для вас больше. В нём переопределён магический метод __contains__, который позволяет оператору in работать с сложностью O(1):


In [1]: %timeit 10**20 in range(10**30)
375 ns ± 10.7 ns per loop

Учтите, что это не работает для функции xrange() в Python 2.

👉@BookPython

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Create: 2025-06-05
Last Update: 2025-07-05 10:41:52


>>> def g():
...     print(1)
...     yield 1
...     print(2)
...     yield 2
...     print(3)
...     yield 3
...
>>> 2 in g()
1
2
True


In [1]: %timeit 10**20 in range(10**30)
375 ns ± 10.7 ns per loop

Учтите, что это не работает для функции xrange() в Python 2.

👉@BookPython

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