将int与char

Question

这是我的program的代码段，当输入要求的值时，会增加该变量的值，并在按下键q后退出循环打印结果。请注意，我的代码通过从用户argv导入sys来获取参数（这就是为什么我的名字在命令行中）。

prompt = "# "
come_out = True
one = 0
two = 0
three = 0
four = 0
answer = 0

while (come_out == True):
   print """
   Enter q to exit()
   > Do you like Got?
   > What about LoTR?
   > Okay, Fargo?
   > Alright, last choice: American Gods?  
   """
answer = raw_input(prompt)
if answer == 1:
    one = one + 1
elif answer == 2:
    two = two + 1
elif answer == 3:
    three = three + 1
elif answer == 4:
    four = four + 1
elif answer == ord('q'):
    come_out = False    
else:
    print "Not applicable ~~~ exiting"
    come_out = False

当我按命令执行脚本时：

$ python ex14.py Sambhav-Jain

它没有给出任何错误但是没有按照假设运行，因为它必须一直运行循环，直到用户通过按键q显式退出，但是：

Hi, Sambhav-Jain. Welcome to your ex14.py script.

Enter q to exit()
> Do you like Got?
> What about LoTR?
> Okay, Fargo?
> Alright, last choice: American Gods?  

# 1
Not applicable ~~~ exiting

GoT Lovers: 0
LoTR Lovers: 0
Fargo Lovers: 0
American God Lovers: 0

然后我在网上搜索并找到了一种方法将answer变量明确地转换为int，即：

answer = int(raw_input(prompt))

通过这样做并执行我用于前一版本的相同命令，它会产生错误：

Hi, Sambhav-Jain. Welcome to your ex14.py script.

Enter q to exit()
> Do you like Got?
> What about LoTR?
> Okay, Fargo?
> Alright, last choice: American Gods?  

# 1

Enter q to exit()
> Do you like Got?
> What about LoTR?
> Okay, Fargo?
> Alright, last choice: American Gods?  

# q
Traceback (most recent call last):
File "ex14.py", line 26, in <module>
   answer = int(raw_input(prompt))
ValueError: invalid literal for int() with base 10: 'q'

PS：请不要将此标记为副本。

Answer 1

raw_input()返回一个字符串。

所以你需要将其转换或仅与字符串进行比较。

如果您将比较更改为：

if answer == '1':
    one = one + 1
elif answer == '2':
    two = two + 1
elif answer == '3':
    three = three + 1
elif answer == '4':
    four = four + 1
elif answer == 'q':
    come_out = False    

它会像你期望的那样工作。