为什么Python 3中的`input`抛出NameError:name ...未定义 [英] Why is `input` in Python 3 throwing NameError: name... is not defined

问题描述

我有一个字符串变量test，在Python 2.x中可以正常工作.

I have a string variable test, in Python 2.x this works fine.

test = raw_input("enter the test") 
print test

但是在Python 3.x中，我这样做:

But in Python 3.x, I do:

test = input("enter the test") 
print test

输入字符串sdas，我收到一条错误消息

with the input string sdas, and I get an error message

Traceback (most recent call last):
 File "/home/ananiev/PycharmProjects/PigLatin/main.py", line 5, in <module>
    test = input("enter the test")
 File "<string>", line 1, in <module> 
NameError: name 'sdas' is not defined

推荐答案

您正在使用Python 2解释器运行Python 3代码.如果不是这样，您的print语句将抛出 SyntaxError 提示您输入之前.

You're running your Python 3 code with a Python 2 interpreter. If you weren't, your print statement would throw up a SyntaxError before it ever prompted you for input.

结果是您正在使用Python 2的 input 尝试eval您的输入(大概是sdas)，发现它是无效的Python，然后死亡.

The result is that you're using Python 2's input, which tries to eval your input (presumably sdas), finds that it's invalid Python, and dies.

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