ceaserCipher.py

def encrypt(message, key):
    encryptMessage = ""

    for char in message:

        # Checking Upper Case.
        if (char.isupper()):
            encryptCharacter = chr(((((ord(char)+key)-65) % 26) + 65))
            encryptMessage += encryptCharacter

        # Checking Lower Case.
        elif (char.islower()):
            encryptCharacter = chr((((ord(char)+key-97) % 26) + 97))
            encryptMessage += encryptCharacter

        # Checking special symbols.
        else:
            encryptCharacter = chr((((ord(char)+key-32) % 33) + 32))
            encryptMessage += encryptCharacter

    return encryptMessage


# Taking input from user.
message = input("Enter the string to encrypt: ")

print("Ceaser Cipher text: ", encrypt(message, 3))