python functools.partial偏函数基本使用

官方源码

class partial(Generic[_T]):
    func: Callable[..., _T]
    args: Tuple[Any, ...]
    keywords: Dict[str, Any]
    def __init__(self, func: Callable[..., _T], *args: Any, **kwargs: Any) -> None: ...
    def __call__(self, *args: Any, **kwargs: Any) -> _T: ...

from functools import partial
basetwo = partial(int, base=2)

basetwo.__doc__ = 'Convert base 2 string to an int.'

basetwo('10010')

实例使用详解

import functools
def add(a, b):
	return a + b
add(4, 2)
6
plus3 = functools.partial(add, 3)
plus5 = functools.partial(add, 5)
# 运行结果
plus3(4)
7
plus3(7)
10
plus5(10)
15