password_program.py

# Name: Andrew Goldstein

def encode(original_password):  # based on given password, encodes and returns an encoded password
    encoded_password = ""
    encoded_char_value = ""
    for i in original_password:
        if (int(i) + 3) > 10:
            encoded_char_value = str((int(i) + 3) % 10)
        else:
            encoded_char_value = str(int(i) + 3)

        encoded_password = encoded_password + encoded_char_value
    return encoded_password


# Decodes the password that was previously encoded.
def decode(enc_password):
    # Assigning decoded_password as an empty string.
    decoded_password = ''

    # This for loop decodes each digit of the encoded password by subtracting 3 and taking modulus 10,
    # then converts the digit to a string and adds the decoded digit to the decoded_password string.
    for digit in enc_password:
        decoded_char = str((int(digit)-3) % 10)
        decoded_password += decoded_char

    # Returns the decoded password.
    return decoded_password


def main():
    user_input = None
    password_to_encode = ""
    encoded_password = ""

    # prints menu, asks for user input and runs corresponding function or closes program
    while user_input != 3:
        print("Menu")
        print("-------------")
        print("1. Encode")
        print("2. Decode")
        print("3. Quit")

        user_input = int(input("\nPlease enter an option: "))

        if user_input == 1:
            password_to_encode = input("Please enter your password to encode: ")
            encoded_password = encode(password_to_encode)
            print("Your password has been encoded and stored!\n")

        if user_input == 2:
            print('The encoded password is ', password_to_encode, ', and the original password is ', decode(password_to_encode), '.\n', sep='')


if __name__ == "__main__":
    main()