达客宁

2023-12-31

Yonny's photo
Yonny

Caesar Cipher in Python:

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']

#import logo from art module
from art import logo
print(logo)

#user input


#define a function
def cipher(ende, message, shift):
  output = ""
  for char in message:
    if char in alphabet:
      if ende == "encode":
        position = alphabet.index(char) + shift
      else:
        position = alphabet.index(char) - shift
      output += alphabet[position]
    else:
      output += char

  print(f"Here is the {ende}d message: {output}.")

#call defined function
yesorno = "yes"
while yesorno == "yes":
  ende = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")
  message = input("Type your message:\n")
  shift = int(input("Type your shift number:\n"))
  shift = shift % 26

  cipher(ende, message, shift)
  yesorno = input("Type 'yes' if you want to go again. Otherwise type 'no'.\n")
  if yesorno == "no":
    print("Bye!")
Python