如何在Python中修复“ IndexError：列表索引超出范围”

Question

my problem is that when I set a for loop to look through a list it doesn't work because it is out of range, even when I start at 0.

I have tried changing the range of the for loop but is isn't working.

Code = input("Enter your Key code: ")

Code = list(Code)

message = input("Enter your message: ")

message = list(message)

for i in (0, len(message)):
    if message[i] == Code[0]:
        message[i] = 'a'

I thought that it would work but it at the start of the for loop it breaks down.

Answer 1

for i in (0, len(message)):

Should probably be

for i in range(len(message)):

You forgot the range

Answer 2

You want to do:

for i in range(len(message)):
    ...

(0, len(message)) is a tuple. Iterating over this will give you 0 , then len(message) (which will always be 1 larger than the biggest valid index in your list), hence causing an IndexError.

You also probably want to check that Code has at least 1 character in it, otherwise Code[0] will also give you an IndexError.

Code = list(Code) or '?'

will set Code to '?' if Code == '' .

Answer 3

You made a typo

it should be like this:

for i in range(len(message))

Your for loop is turple so it will always start from 1+ of what u want