how could i include all the keys in the username? even if they're multipul? for example, if the username is "ad" and it's not include at the library

user_guess = input("Guess a letter: ")

if len(user_guess) > 1 and user_guess in 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ':
    print("E1")
elif user_guess not in 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ':
    print("E2")
elif(len(user_guess) > 1) and (user_guess not in 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'):
    print("E3")
else:
    print(user_guess.lower())

>Solution :

if user_guess in 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

This is only true if user_guess is not a substring of the entire alphabet (in that order). I think this isn’t what you want. My guess is that you want to make sure that user_guess is only made up of alphabetic characters.

You can do this yourself, by checking each character of user_guess.

Or you can just do

if user_guess.isalpha()