thecode.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']

from asci import logo
print(logo)

def caesar(start_text, shift_amount, cipher_direction):
    end_text = ""
    if  cipher_direction == "decode":
            shift_amount = shift_amount * -1 
    
    for char in start_text:
        if  char in alphabet:
             position = alphabet.index(char)
             new_position = position + shift_amount 
             end_text = end_text + alphabet[new_position]
        else:
             end_text = end_text + char
             
    
    print(f"The {cipher_direction}text  is {end_text}\n")


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

     shift = shift % 26
     caesar(start_text=text, shift_amount=shift, cipher_direction=direction)

     result = input("Type 'yes' if you want to do agina. Otherwise type 'no'.\n")

     
     if result == "no":
          should_continue = False
          print("GoodBye")