Learn String Manipulation by Building a Cipher - Step 85

Python
1

I’m doing what the step is asking me respectively but it keeps returning that the code has raised an error.

these are the instructions: Next, modify your encryption and decryption variables by calling encrypt and decrypt , respectively, in place of vigenere .

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 encrypt(message, key)
    
def decrypt(message, key):
    return decrypt(message, key, -1)
    
encryption = encrypt(text, custom_key)
print(encryption)
decryption = decrypt(encryption, custom_key)
print(decryption)

# User Editable Region

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 85

2

encryption and decryption variables are OK

The problem is in the functions, you modified the return statements

reset the step to restore the original code. Then only modify the code you are asked to.

3

Thank you, i hadn’t noticed.

4

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