Python：函数定义在所需输出的中间一直返回“None”

Question

好吧，我正在为我女朋友为我们6周年纪念做代码。 我对编程一窍不通。基本上是为了让用户输入一些简单的输入（m）指令。在

我运行代码时总是看到“无”。为什么？ 好了。在

def love(n):
  if n < 0 : 
    print "Why would it be negative?!" 
  if n == 0 : 
      print "well that is just hurtful" 
  if n == 1 :
    print "I REALLY love you" 
  if n == 2 : 
    print "You make me smile at least once, each and every day"
  if n == 3 : 
    print"you wouldn't believe how annoying it was to get this program to run properly! but it was worth it"
  if n == 4 : 
      print "let's " + "shoot a little higher than that"
  else:
    print "I honestly can't see myself without you anymore" 


print love(0) 

print "Wanna try again? :D "

Answer 1

您的函数有一个默认返回值None，因此当您print输出它时，它将打印None。在

只需调用不带print语句的函数。在

或者，可以用return替换函数中的所有print语句，并将其转换为if-elif-else块，因为它们都是互斥操作。然后，打印love(0)将实际打印出返回值。在