Question

我一直试图解决这个问题太久了！怎么办？

def fallBack(submission):
    if (submission == ""):
           submission = "fixed!"  
           return(submission)

name = input("What is your name?")
(fallBack(name))

location = input("Hi "+name+"! Nice to meet you, I live inside a computer, where do you live?")

我一直没有打印出最后一个输入......

Answer 1

您需要存储fallBack()的结果。另外，更改fallBack()以返回原始值（如果它是非空的：

）

def fallBack(submission):
    if not submission:
        return "fixed!"
    else:
        return submission

然后，像这样使用它：

name = fallBack(input("What is your name?"))

Answer 2

只需移除fallBack(name)

周围的括号即可

def fallBack(submission):
    if (submission == ""):
        submission = "fixed!"  
    return submission

name = input("What is your name?")
name = fallBack(name)

location = input("Hi "+name+"! Nice to meet you, I live inside a computer, where do you live?")

另请记住，如果使用python 2.7，则应使用raw_input代替input

Answer 3

我不确定你想做什么，但我认为这样做会：

def fallBack(submission):
    if (submission == ""):
           submission = "fixed!"  
    return (submission)

name = input("What is your name?")
name = fallBack(name)

location = input("Hi "+name+"! Nice to meet you, I live inside a computer, where do you live?")

你的两个错误不是在没有任何东西需要修复的情况下返回任何内容，而不是为了确定函数返回的值。

顺便说一句，在Python中有一种更惯用的方法：

name = input("What is your name?")
name = name or 'fixed!'

location = input("Hi "+name+"! Nice to meet you, I live inside a computer, where do you live?")

第二行测试是否将name转换为布尔值，如果它返回False（对于字符串，它等同于测试它是否为空），将其替换为{{ 1}}

Answer 4

回报没有很好地对齐！除非提交是空的，否则您不会返回任何内容！： - ）

def fallBack(submission):
    if (submission == ""):
        submission = "fixed!"  
    return(submission)

Python函数为空白条目提供默认值不起作用

4 个答案: