Python 不断为列表抛出“TypeError”错误，我不知道如何修复它

Question

So, I'm kind of new to Python, and I'm trying to make a small command line menu system with lists, using the following code:

menu = ["item1", "item2", "item3", "item4"]

i = 0

for item in menu2:
    print(str(i) + str(menu[item]))
    i = i + 1

But whenever I run that code, I'm thrown the following error:

TypeError: list indices must be integers, not str        

Can anyone tell me why this is happening or how to fix it? I've tried most anything I can think of.

Thanks in advance!

Answer 1

remove str also not needed menu. print statement should be like below.

print(i + item)

Answer 2

You can use the range function

You are having a TypeError because menu is a list, not a string. It wants you to define the index to access the string inside the list.

menu = ["item1", "item2", "item3", "item4"]


for item in range(len(menu)):
    print(str(item) + str(menu[item]))