如何在Python 2中从键盘获得用户输入? [英] How do I get user input from the keyboard in Python 2?

问题描述

我用Python编写了一个函数，提示用户输入两个数字并将其相加. 它还提示用户输入城市并进行打印.出于某种原因，当我在shell中运行它时，进入城市后会显示名称未定义".

I wrote a function in Python which prompts the user to give two numbers and adds them. It also prompts the user to enter a city and prints it. For some reason, when I run it in a shell, I get "name is not defined" after I enter the city.

def func_add(num1, num2):
   a = input("your city")
   print a
   return num1 + num2 

推荐答案

如果您使用的是Python 2，则需要使用raw_input:

If you're on Python 2, you need to use raw_input:

def func_add(num1, num2):

   a = raw_input("your city")
   print a
   return num1 + num2 

input会使您键入的任何内容都被评估为Python表达式，所以最终得到

input causes whatever you type to be evaluated as a Python expression, so you end up with

a = whatever_you_typed

因此，如果没有名为whatever_you_typed的变量，则会得到一个NameError.

So if there isn't a variable named whatever_you_typed you'll get a NameError.

使用raw_input可以保存您在字符串中键入的所有内容，因此最终得到

With raw_input it just saves whatever you type in a string, so you end up with

a = 'whatever_you_typed'

将a指向该字符串，这就是您想要的.

which points a at that string, which is what you want.

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