Learn String Manipulation by Building a Cipher - Step 86

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Stuck and need a hint! Thanks

Your code so far

text = 'mrttaqrhknsw ih puggrur'
custom_key = 'python'

def vigenere(message, key, direction=1):
    key_index = 0
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    final_message = ''

    for char in message.lower():

        # Append any non-letter character to the message
        if not char.isalpha():
            final_message += char
        else:        
            # Find the right key character to encode/decode
            key_char = key[key_index % len(key)]
            key_index += 1

            # Define the offset and the encrypted/decrypted letter
            offset = alphabet.index(key_char)
            index = alphabet.find(char)
            new_index = (index + offset*direction) % len(alphabet)
            final_message += alphabet[new_index]
    
    return final_message

def encrypt(message, key):
    return vigenere(message, key)
    
def decrypt(message, key):
    return vigenere(message, key, -1)

/* User Editable Region */

encryption = encrypt(text, custom_key)
print('Encrypted text: ' + text)
print('Key: ' + custom_key)
decryption = decrypt(encryption, custom_key)
print('Decrypted text: ' + decryption)

/* User Editable Region */

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 86

Delete encryption and pass text as the first argument to decrypt.

Can you ask a more specific question? Not quite sure how to help.

decrypt is passed two arguments, encryption and custom_key. The first argument is encryption.