即使它有一个return语句，我的函数仍然返回None [英] My function keeps returning None even though it has a return statement

问题描述

我有一个非常短的函数，它位于一个继续返回 None 的类中，尽管我已经将之前的打印语句转换为return语句，下面是我有：
$ b $ pre $ def解释（self）：
return（print（'Wear a'，self.getColor（） ，'shirt'）


该语句会打印出来，但每次打印没有在下一行，请让我知道我怎么能阻止这种情况的发生！

这是因为终端上打印了 print 的输出，而 print 函数本身的值是 None ，这就是返回的结果。

如果您希望返回值并将其打印出来，你可以这样做：

  def explain（self）：
 string ='穿一个'+ self.getColor （）+'shirt'
 print（string）
返回字符串
  

如果只需要返回值，只需删除上面的print语句，稍后可以打印。

I have a very short function located within a class that keeps returning None, even though I have turned what was previously a print statement into a return statement, here's what I have:

def explain(self):
    return(print('Wear a', self.getColor(), 'shirt')

The statement will print out but every time it prints None on the next line, please let me know how I can stop this from happening!

解决方案

This is because the output of the print is printed on the terminal, and the value of the print function in itself is a None, which is what is returned.

If you wish to return the value as well as print it, you can do something like:

def explain(self):
    string = 'Wear a' + self.getColor() + 'shirt'
    print(string)
    return string

If only returning the value is needed, simply remove the print statement in the above and you can print it later.

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