Caeser_Cipher.py

logo = """
 ██████╗ █████╗ ███████╗███████╗███████╗██████╗      ██████╗██╗██████╗ ██╗  ██╗███████╗██████╗ 
██╔════╝██╔══██╗██╔════╝██╔════╝██╔════╝██╔══██╗    ██╔════╝██║██╔══██╗██║  ██║██╔════╝██╔══██╗
██║     ███████║█████╗  ███████╗█████╗  ██████╔╝    ██║     ██║██████╔╝███████║█████╗  ██████╔╝
██║     ██╔══██║██╔══╝  ╚════██║██╔══╝  ██╔══██╗    ██║     ██║██╔═══╝ ██╔══██║██╔══╝  ██╔══██╗
╚██████╗██║  ██║███████╗███████║███████╗██║  ██║    ╚██████╗██║██║     ██║  ██║███████╗██║  ██║
 ╚═════╝╚═╝  ╚═╝╚══════╝╚══════╝╚══════╝╚═╝  ╚═╝     ╚═════╝╚═╝╚═╝     ╚═╝  ╚═╝╚══════╝╚═╝  ╚═╝
                                                                                               
                                    ██████╗ ██╗   ██╗                                          
                                    ██╔══██╗╚██╗ ██╔╝                                          
                                    ██████╔╝ ╚████╔╝                                           
                                    ██╔══██╗  ╚██╔╝                                            
                                    ██████╔╝   ██║                                             
                                    ╚═════╝    ╚═╝                                             
                                                                                               
    ██████╗ ██████╗  ██████╗ ███████╗ █████╗ ███╗   ██╗███╗   ██╗██╗   ██╗████████╗██╗         
    ██╔══██╗██╔══██╗██╔═══██╗██╔════╝██╔══██╗████╗  ██║████╗  ██║╚██╗ ██╔╝╚══██╔══╝██║         
    ██████╔╝██████╔╝██║   ██║█████╗  ███████║██╔██╗ ██║██╔██╗ ██║ ╚████╔╝    ██║   ██║         
    ██╔═══╝ ██╔══██╗██║   ██║██╔══╝  ██╔══██║██║╚██╗██║██║╚██╗██║  ╚██╔╝     ██║   ██║         
    ██║     ██║  ██║╚██████╔╝██║     ██║  ██║██║ ╚████║██║ ╚████║   ██║      ██║   ██║         
    ╚═╝     ╚═╝  ╚═╝ ╚═════╝ ╚═╝     ╚═╝  ╚═╝╚═╝  ╚═══╝╚═╝  ╚═══╝   ╚═╝      ╚═╝   ╚═╝        
"""

print(logo)


#Alphabet list
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']


#Cipher function to encrypt and decrypt
def cipher(start_text, shift_amount, cipher_direction):
  end_text = ""
  if cipher_direction == 'decode':
      shift_amount *= -1
  for char in start_text:
    if char in alphabet:
        position = alphabet.index(char)
        new_position = ((position + shift_amount) % 26)
        end_text += alphabet[new_position]
    else:
        end_text += char
  print(f"Here's the {direction}d result: {end_text}")


#Loop to restart the program once over
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"))

#Calling the cipher function
    cipher(start_text=text, shift_amount=shift, cipher_direction=direction)

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