caesar.py

#caesar cipher encrypt and decrypt
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']


def caesar(original_text, shift_amount, encode_or_decode):
    output_text = ""
    if encode_or_decode == "decode":
        shift_amount *= -1
    for letter in original_text:
        #if the user enters a number/symbol/space it is added as it is to result
        if letter in alphabet:
            shifted_position = alphabet.index(letter) + shift_amount
            shifted_position %= len(alphabet)
            print(shifted_position)
            output_text += alphabet[shifted_position]
        else:
            output_text+=letter
    print(f"Here is the {encode_or_decode}d result: {output_text}")

restart=True
while restart:
    direction = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n").lower()
    text = input("Type your message:\n").lower()
    shift = int(input("Type the shift number:\n"))


    caesar(original_text=text, shift_amount=shift, encode_or_decode=direction)

    print("to continue enter 'yes'\nto end enter 'no'")
    restart=input()
    if restart=="no":
        restart=False