cesar-decrypter.py

alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
crypted_message = "KLZWSHGHTPLUAV"
def cesar_alphabet(alphabet, positions):
    if(positions >= len(alphabet)):
        return alphabet
    else:
        return alphabet[positions:] + alphabet[:positions]

def decrypt(crypted_message, alphabet, crypted_alphabet):
    message = ''
    for crypted_message_letter in crypted_message:
        for le, crypted_alphabet_letter in enumerate(crypted_alphabet):
            if(crypted_alphabet_letter == crypted_message_letter):
                message += alphabet[le]
    return message

crypted_alphabet = cesar_alphabet(alphabet, 7)
message = decrypt(crypted_message, alphabet, crypted_alphabet)
 
print(alphabet, crypted_alphabet, message)