Learn String Manipulation by Building a Cipher - Step 83

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Hi,

Can someone help me on this lesson please?

I’ve tried print(‘Encrypted’ + ’ text:’ + ecryption) instead, but then I end up with “bpmaodgfdugj xf ibutgsk” as the string because of the encryption.

I’m wondering if I need to change something outside of the print function too, but the instructions say to “modify print(encryption)”.

Thanks in advance :slight_smile:

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:' + ' mrttaqrhknsw' + ' ih' + ' puggrur')
decryption = decrypt(encryption, custom_key)
print(decryption)

/* User Editable Region */

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 83

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you don’t need to change anything outside the print, but you need to use a different variable, one that actually contains the string you should print

1 Like

Thanks for your help, Ilenia - I got there in the end!

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