如果然后Python声明麻烦 [英] Python if then statement trouble

问题描述

你好，

我正在编写一个无聊的python游戏，但是我有if / then语句的问题我将发布代码和错误。



错误



回溯（最近一次通话）：





文件adv.py，第12行，在< module>

如果x == y：

NameError：name'y '未定义



代码：

Hello,
I'm writing a python game to play when bored but i'm having issuses with an if/then statement I will post code and error.

Error

Traceback (most recent call last):


File "adv.py", line 12, in <module>
if x == y:
NameError: name 'y' is not defined

Code:

    x = raw_input('[Rome] ---> [y/n]')
if x == y: 

	print '[Nation] Rome has taken over Gaul'
	print '[Nation] Gaul has fallen into ruins.'
	
 

    else:
    	print 'Gaul has defeated Rome'</module>

推荐答案

y 是变量'y'是一个值。

我想你要比较 x 到值'y'

y is a variable 'y' is a value.
I guess you want to compare x to the value 'y'

if x == 'y': 

你的代码还有其他问题，你应该通过列出一个完整的模块或功能改进问题。

我不知道要知道你以前在你的代码项目中是否定义了Y，而是从包含的代码中定义，这里最明显的错误是：你要求

I don't know if you define Y previously in your code project but from the included code, the most glaring error here is: you are asking

if X == Y

并且你没有预先指定

Y

。



所以基本上;如果变量等于未定义的变量，则执行以下代码：

before hand.

So basically; if variable equal to undefined variable, execute below code:

print('[Nation] Rome has taken over Gaul')
print ('[Nation] Gaul has fallen into ruins.'):
else:
    print 'Gaul has defeated Rome'

然而，什么东西得到印刷？如果你得到误报，那将是非常不幸的....即你的y变量意外地等于x并且在零星的时间给出了预期的程序执行正回报。





或许定义之前的y会消除我们的任何歧义。



ie

However, how often is anything getting printed? It would be pretty unfortunate if you were getting false positives.... i.e. your y variable accidentally equals x and gives the intended positive return of program execution at sporadic times.


Perhaps defining y before hand would take away any ambiguity for us.

i.e.

y = f[0]
x = raw_input('[Rome] ---> [y/n]')
if x == y: 
 
	print '[Nation] Rome has taken over Gaul'
	print '[Nation] Gaul has fallen into ruins.'
	
 
 
    else:
    	print 'Gaul has defeated Rome'

我建​​议你工作通过 Python教程 [ ^ ]。

I suggest you work through The Python Tutorial[^].

这篇关于如果然后Python声明麻烦的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！