for and while looping with list problem

Question

I have tried to make simple for and while looping with list element, but there's still something IndexError

Here is the code:

list_registered_username = ['max', 'paul']
#to login
reload = 1
while reload == 1:
username = input("username: ")
for i in range(len(list_username)+1):
if username != list_username[i]:
reload = 1
elif username == list_username[i]:
reload = 0
#next step func...

And the IndexError is located at line:
if username != list_username[i]:
IndexError: list index out of range

Process finished with exit code 1

I'll thank to someone who can fix it

Answer 1

This line:

for i in range(len(list_username)+1):

shouldn't have the "+ 1" because your list doesn't have an index that big,

Answer 2

Use for i in range(len(list_registered_username)

I suggest you change the username to lowercase incase the user enters the first alphabet in uppercase
username=input("username: ").lower()

Answer 3

@slick oh thank you for answering
@Roy thanks for your responding