Learn String Manipulation by Building a Cipher - Step 84

Python
1

Tell us what’s happening:

There’s an error message : Your decrypt function should return vigenere(message, key, -1) . even though my decrypt function already returns the vigenere function with the correct parameters.

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

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

# User Editable Region

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 84

2

try removing the spaces at the end of this line, the tests still have some issues

3

Thank you so much!! I was struggling to find out what was wrong with it for an hour

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4

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