Python-Learning/Caesar_cipher at main · rgabiazo/Python-Learning · GitHub

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import caesar_art

print(caesar_art.logo)

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']
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"))


def caesar(plain_text,shift_amount,direction_choice): # My Solution

    while direction_choice == 'encode' or direction_choice == 'decode':

        user_text_letters = []
        encode_text = []
        decode_text = []
        encode_list = []
        decode_list = []
        direction_choice = direction_choice
        plain_text = plain_text
        shift_amount = shift_amount

        for char in plain_text:
            user_text_letters.append(char)

        while shift_amount > len(alphabet):
            if shift_amount > len(alphabet):
                new_shift = shift_amount - len(alphabet)
                shift_amount = new_shift

        if direction_choice == 'encode':
            for i in range(len(user_text_letters)):
                for j in range(len(alphabet)):
                    if user_text_letters[i] == alphabet[j]:
                        new_index = j + shift_amount
                        if new_index >= len(alphabet):
                            new_index = new_index - len(alphabet)
                        encode_text.append(alphabet[new_index])

            for symbol in range(len(user_text_letters)):
                if user_text_letters[symbol] not in encode_text and user_text_letters[symbol] not in alphabet and user_text_letters[symbol] != ' ':
                    encode_text.insert(symbol,user_text_letters[symbol])
                elif user_text_letters[symbol] == ' ':
                    encode_text.insert(symbol, ' ')
                elif user_text_letters[symbol] in encode_text and user_text_letters[symbol] not in alphabet and user_text_letters[symbol] != ' ':
                    encode_text.insert(symbol,user_text_letters[symbol])

            for char in encode_text:
                encode_list.append(char)

            encode_list = ''.join(encode_list)
            print(f"The encoded text is {encode_list}")
            yes_no = input("Type 'yes' if you want to go again. Otherwise type 'no'. ")
            if yes_no == 'yes':
                direction_choice = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")
                plain_text = input("Type your message:\n").lower()
                shift_amount = int(input("Type the shift number:\n"))
            elif yes_no == 'no':
                print("Goodbye.")
                break

        if direction_choice == 'decode':

            user_text_letters = []
            encode_text = []
            decode_text = []
            encode_list = []
            decode_list = []
            direction_choice = direction_choice
            plain_text = plain_text
            shift_amount = shift_amount

            for char in plain_text:
                user_text_letters.append(char)

            while shift_amount > len(alphabet):
                if shift_amount > len(alphabet):
                    new_shift = shift_amount - len(alphabet)
                    shift_amount = new_shift

            for x in range(len(user_text_letters)):
                for y in range(len(alphabet)):
                    if user_text_letters[x] == alphabet[y]:
                        new_index = y - shift_amount
                        decode_text.append(alphabet[new_index])

            for symbol2 in range(len(user_text_letters)):
                if user_text_letters[symbol2] not in decode_text and user_text_letters[symbol2] not in alphabet and user_text_letters[symbol2] != ' ':
                    decode_text.insert(symbol2,user_text_letters[symbol2])
                elif user_text_letters[symbol2] == ' ':
                    decode_text.insert(symbol2, ' ')
                elif user_text_letters[symbol2] in decode_text and user_text_letters[symbol2] not in alphabet and user_text_letters[symbol2] != ' ':
                    decode_text.insert(symbol2,user_text_letters[symbol2])

            for char2 in decode_text:
                decode_list.append(char2)

        decode_list = ''.join(decode_list)
        print(f"The decoded text is {decode_list}")
        yes_no = input("Type 'yes' if you want to go again. Otherwise type 'no'. ")
        if yes_no == 'yes':
            direction_choice = input("Type 'encode' to encrypt, type 'decode' to decrypt:\n")
            plain_text = input("Type your message:\n").lower()
            shift_amount = int(input("Type the shift number:\n"))
        elif yes_no == 'no':
            print("Goodbye")
            break


caesar(plain_text = text, shift_amount = shift, direction_choice = direction)