Learn String Manipulation by Building a Cipher - Step 79

Python
1

Tell us what’s happening:

From your new function, return vigenere(message, key) .

Your code so far

text = 'Hello Zaira!'
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

# User Editable Region

def encrypt(message, key):
    pass
    return vigenere(text, custom_key)

    encryption = vigenere(text, custom_key)
    print(encryption)
    decryption = vigenere(encryption, custom_key, -1)
    print(decryption)

encrypt()


# User Editable Region

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 79

2

the error raised is that you called encrypt without any arguments when it expects 2

3

return vigenere(text, custom_key)

Doesn’t look like you’ve returned what was asked.

Also, you need to remove pass

and the instructions don’t say anything about calling encrypt() at the end

4

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