Python函数返回无 [英] Python Function Returning None

问题描述

我非常简单的python函数在它的结尾处返回'None'，我不知道为什么。我看了一些其他帖子，仍然无法弄清楚。
任何帮助表示赞赏。

My very simple python function is returning 'None' at the end of it and I'm not sure quite why. I've looked at some other posts and still can't figure it out. Any help is appreciated.

以下是我的代码：

Here is my code:

def printmult(n):
    i = 1
    while i <= 10:
        print (n * i, end = ' ')
        i += 1

print(printmult(30))

推荐答案

其他答案都做得很好指出错误的位置，即你需要明白打印和返回是不一样的。如果你希望你的函数返回一个你可以打印或存储在变量中的值，你需要这样的东西：

The other answers have done a good job of pointing out where the error is, i.e. you need to understand that printing and returning are not the same. If you want your function to return a value that you can then print or store in a variable, you want something like this:

def returnmult(n):
    i = 1
    result_string = ''
    while i <= 10:
        result_string += str(n * i) + ' '
        i += 1
    return result_string

print(returnmult(30))

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