Python:如何更改函数的输入参数的值? [英] python: how to change the value of function's input parameter?

问题描述

我试图在函数内部修改字符串的值，如下所示:

I tried to modify the value of a string inside a function, like below:

>>> def appendFlag(target, value):
...     target += value
...     target += " "
...
>>> appendFlag
<function appendFlag at 0x102933398>
>>> appendFlag(m,"ok")
>>> m
''

好吧，似乎目标"仅在函数内部更改，但是如何使新值在函数外部可行?谢谢.

Well, seems the "target" is only changed within the function, but how to make the new value viable outside the function? Thanks.

推荐答案

这在python中通过返回进行处理.

This is handled in python by returning.

def appendFlag(target, value):
   target += value
   target += " "
   return target

您可以像这样使用它:

m = appendFlag(m,"ok")

您甚至可以返回几个这样的变量:

you can even return several variables like this:

def f(a,b):
   a += 1
   b += 1
   return a,b

并像这样使用它:

a,b = f(4,5)

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