Learn String Manipulation by Building a Cipher - Step 90

Python
1

Tell us what’s happening:

i don’t understand what i am doind wrong, i am doind what its said and the console shows the correct output

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 90

2

Capitalization matters. As does spacing and concatenation. Concatenation is using the concatenation + operator.

From the challenge:

Below the print() call you just added, add another print() call to print Key: python by concatenating the string 'Key: ' and the value of the custom_key variable.

3

that’s exactly what i did , still tells me i am wrong

4

Your key is lower case and lacking a trailing space. 'Key: ' is what you are looking for. In addition, you need to use the concatenation operator.

5

thank you i just replaced the k in lower case to “K”