Python类型错误不支持的操作数

Question

我在这里有一个示例程序，当我运行它并选择一个选项但是我没有看到问题时返回以下错误。

  

TypeError：不支持的操作数类型 - ：'str'和'int'

#Exception Handling

#If you haven't seen them before, you're not trying hard enough. What are they? Errors. Exceptions. Problems. Know what I'm talking about? I got it with this program:

#Code Example 1 - buggy program
def menu(list, question):
    for entry in list:
        print (1 + list.index(entry),)
        print (")" + entry)

    return input(question) -1

answer = menu(['A','B','C','D','E','F','H','I'],\
'Which letter is your favourite?')

print ('You picked answer ' + (answer + 1))

Answer 1

如果您使用Python3，则input(question)会返回字符串'1'，'2'等。您必须将其转换为数字int(input(question))。