Question

我正在尝试解决此分配，并在运行代码时打印额外的输出。任何人都可以告诉我在哪里弄乱了代码以及如何修复它？谢谢！我有时想要同时缩进并退回几行，我该怎么做？

分配创建一个具有主函数和名为tester的子函数的程序。 main功能会提示用户输入input "Write something (quit ends): "，并将此input作为参数发送给子功能。

定义子功能tester，使其具有一个名为givenstring的参数，其默认值为Too short。如果用户输入少于10个字符，则程序使用默认值，如果10或更多，则打印usergiven input。如果用户输入"quit"，则程序终止。如果工作正常，程序将print出类似的内容：

>>> 
Write something (quit ends): what?
Too short
Write something (quit ends): What do you mean?
What do you mean?
Write something (quit ends): Ok thats it
Ok thats it
Write something (quit ends): I am out of here
I am out of here
Write something (quit ends): quit
>>>

测试字符串长度的最简单方法是使用函数len()。示例输出

写一些东西（退出结束）：什么？太短写点东西（退出结束）：你是什么意思？你什么意思？写点东西（退出结束）：好吧就是这样好吧，就是这样写点东西（退出结束）：我不在这里我不在这里写点东西（退出结束）：退出

我的代码：

while True: 
def tester(givenstring="Too short"):
    result=len(wrote)
    if result<10:
        print(givenstring)
    else:
        print(wrote)

wrote=input("Write something (quit ends): ")


if wrote=="quit":
    break
else:
    tester(wrote)

if __name__ == "__main__":

    tester()

我的代码输出：

Write something (quit ends): what?
what?
Too short
Write something (quit ends): What do you mean?
What do you mean?
What do you mean?
Write something (quit ends): Ok thats it
Ok thats it
Ok thats it
Write something (quit ends): I am out of here
I am out of here
I am out of here
Write something (quit ends): quit

输出应如下所示：

Write something (quit ends): what?
Too short
Write something (quit ends): What do you mean?
What do you mean?
Write something (quit ends): Ok thats it
Ok thats it
Write something (quit ends): I am out of here
I am out of here
Write something (quit ends): quit

Answer 1

tester只有一个参数：

def tester(givenstring="Too short"):

所以当你打电话

tester(wrote)

您将givenstring替换为wrote。

更改功能定义：

def tester(wrote, givenstring="Too short"):

将函数定义移到 while循环之外也会更有效。

此外，您在没有任何参数tester的情况下致电if __name__ == "__main__"。您可以将整个while True循环包裹在def main():中并调用：

def tester(...):
    ...

def main():
    while True:
        ...

if __name__ == "__main__":
    main()

Answer 2

似乎你的代码结构不起作用，并且你想使用raw_input而不是input。试试这个 -

def tester(givenstring):
    result=len(givenstring)
    if result>10:
        print(givenstring)
    else:
        print("Too short")

def main():
    while True:
        wrote=raw_input("Write something (quit ends): ")
        if wrote=="quit":
            break
        else:
            tester(wrote)

if __name__ == "__main__":
    main()

python函数和使用默认参数的子函数

2 个答案: