存储函数时如何传递预定义参数 [英] How to pass predefined arguments when storing a function

问题描述

是否可以存储带有预定义参数的函数以供另一个函数调用?

例如:

def 函数(编号):打印编号触发器=函数#存储函数(1)trigger() #prints 1触发器=函数#存储函数(2)trigger() #prints 2

trigger 在不传递任何参数的情况下调用存储的任何内容.我可以更改触发器，但这需要我重写调用触发器的函数，所以我想知道是否有办法在将函数存储在变量中时将函数与参数一起存储.

解决方案

您正在寻找 functools.partial:

<预><代码>>>>导入功能工具>>>def foo(数字):...打印号码...>>>bar = functools.partial(foo, 1)>>>酒吧()1

Is it possible to store a function with predefined arguments to be called by another function?

For example:

def function(num):
    print num

trigger=function #store function(1)
trigger()        #prints 1

trigger=function #store function(2)
trigger()        #prints 2

trigger calls whatever is stored without passing any arguments. I can change trigger but that would require me to rewrite the function that calls the trigger, so I'm wondering if there is a way to store functions along with arguments when storing a function in a variable.

解决方案

You're looking for functools.partial:

>>> import functools
>>> def foo(number):
...     print number
... 
>>> bar = functools.partial(foo, 1)
>>> bar()
1

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