帮助"def"在python3中 [英] Help with "def" in python3

问题描述

a = input("say ''hi''")
def toyou()
	return a + "to you too"
print(toyou)
print(toyou + !)

我收到语法无效"错误.

我要发生的事情是接受输入并添加给您".然后我第一次打印，然后第二次打印！".到最后.

谢谢

I get an "invalid syntax" error.

What i want to happen is it to take the input and add "to you". Then i print that the first time, then the second an a "!" to the end.

Thank you

推荐答案

乍一看，我立即看到:缺少``:''.下一个错误:函数调用中缺少圆括号.另一个:在！"中没有引号.

必须为:

From the first glance I immediately see: lack of '':''. Next bug: lack of round brackets at the function call. Another one: lack of quotation marks in "!".

Must be:

a = input("say ''hi'' ")
def toyou()
    return a + " to you too"
print toyou()
print toyou() + "!"

一个普遍的问题:字符串连接要求将变量a分配给字符串.如果用户输入12，则toyou()将失败.它要求用户输入带引号的字符串文字. "12"和"hi"一样好.另外，请注意:我添加了两个额外的空格字符以改善输入提示和串联输出；您可以将输入"hi"与"toto you"连接起来，从而产生"hito you too".

另一个问题是在函数外部的上下文中使用变量a.您最好使用一个参数:

One general problem: string concatenation requires the variable a to be assigned to string. If the user input 12, toyou() will fail. It requires the user to input string literal with quotation marks; "12" would work as well as "hi". Also, pay attention: I added couple of extra blank space character to improve input prompt and output of concatenation; you would concatenate input "hi" with "to you too" resulting in "hito you too".

Another problem is using a variable a from the context outside of the function. You should better use a parameter:

def toyou(someValue)
    return someValue + " to you too"

a = input("say ''hi'' ")
print toyou(a)
print toyou(a) + "!"

我在发布之前测试了代码片段.

看，我在第二次帮助您解决几乎相同的问题(顺便说一句，感谢您接受我以前的解决方案).也许您需要改进您的工作/学习方法:更加注意先前的答案，首先阅读文档，然后做得更透彻，对每个小细节都更加关注.您的问题很容易解决.加快速度.

希望对您有帮助.

—SA

I tested the code fragments before posting.

Look, I''m helping you for the 2^nd time with nearly the same question (thank you for accepting my previous solution, by the way). Maybe you need to improve your method of work/learning: pay more attention for the previous answers, read documentation first and do it more thoroughly, pay more attention of every small detail. Your problems are very easy; get to the speed.

Hope it will help you.

—SA

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