Иногда нужно создать функцию на основе более универсальной.Например

Библиотека Python разработчика | Книги по питону

Иногда нужно создать функцию на основе более универсальной.

Например, у функции int() есть параметр base, который мы хотим зафиксировать, чтобы получить новую функцию base2:


>>> int("10")
10
>>> int("10", 2)
2
>>> def base2(x):
...     return int(x, 2)
...
>>> base2("10")
2

functools.partial позволяет сделать то же самое, но точнее и семантически понятнее:


base2 = partial(int, base=2)

Это полезно, когда нужно передать функцию как аргумент другой, более общей функции, но при этом некоторые аргументы должны быть зафиксированы:


>>> map(partial(int, base=2), ["1", "10", "100"])
[1, 2, 4]

Без partial пришлось бы делать так:


>>> map(lambda x: int(x, base=2), ["1", "10", "100"])
[1, 2, 4]

👉@BookPython

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>>> int("10")
10
>>> int("10", 2)
2
>>> def base2(x):
...     return int(x, 2)
...
>>> base2("10")
2

functools.partial позволяет сделать то же самое, но точнее и семантически понятнее:


base2 = partial(int, base=2)


>>> map(partial(int, base=2), ["1", "10", "100"])
[1, 2, 4]

Без partial пришлось бы делать так:


>>> map(lambda x: int(x, base=2), ["1", "10", "100"])
[1, 2, 4]

👉@BookPython

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