Learn String Manipulation by Building a Cipher - Step 83

Python
1

I tried to do this the way it is saying but it isn’t working

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:', 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 83

2

Is this printing what the instructions asked?

3

I did it multiple different ways. Like this. What am I doing wrong

print(‘Encrypted’ + ’ text: mrttaqrhknsw ih puggrur’)

4

You need to print Encrypted text: mrttaqrhknsw ih puggrur
You need to concatenate a string and a variable. What variable stores this value mrttaqrhknsw ih puggrur?

5

Isn’t it supposed to be text?

6

That’s correct. Any other doubts?

7

Is it supposed to be:
print(‘Encrypted text:’ + text)

8

Look at the output and you will see a small difference. But you are very close.

9

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