Learn String Manipulation by Building a Cipher - Step 89

Python
1

Tell us what’s happening:

Describe your issue in detail here.

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

print('Encrypted text: ' + text)
print('key: ' + custom_key )

# User Editable Region

#decryption = decrypt(encryption, custom_key)
#print(decryption)

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 89

2

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3

You will have to capatalize the K, but your logic is right.

4

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