cc.py

alphabet = [
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
    'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'a', 'b', 'c', 'd',
    'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
    't', 'u', 'v', 'w', 'x', 'y', 'z'
]


def caesar(input, shift, dir):
    result = ""
    if dir == "decode":
        shift *= -1
    for char in input:
        if char in alphabet:
            position = alphabet.index(char)
            new_position = position + shift
            result += alphabet[new_position]
        else:
            result += char
    print(f"Here's the {dir}d result: {result}")


from art import logo

print(logo)

should_end = False
while not should_end:
    direction = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")
    text = input("Type your message:\n").lower()
    shift = int(input("Type the shift number:\n"))
    shift %= 26

    caesar(text, shift, direction)

    restart = input(
        "Type 'yes' if you want to go again. Otherwise type 'no'.\n")
    if restart == "no":
        should_end = True
        print("Thankyou :) ")