Learn String Manipulation by Building a Cipher - Step 65

Python
1

please correct my coding

text = 'Hello Zaira'
custom_key = 'python'

def vigenere(message, key, direction):
    key_index = 0
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    result_text = ''

    for char in message.lower():
        # Append space to the message
        if char == ' ':
            result_text += 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 resulting letter
            offset = alphabet.index(key_char)
            
            index = alphabet.find(char)
            if direction == 'encrypt':
                new_index = (index + offset) % len(alphabet)
            elif direction == 'decrypt':
                new_index = (index - offset) % len(alphabet)
            else:
                raise ValueError("Invalid direction. Please use 'encrypt' or 'decrypt'.")
            
            result_text += alphabet[new_index]

    return result_text


encryption = vigenere(text, custom_key, 'encrypt')
print('Plain text:', text)
print('Encrypted text:', encryption)


# decryption = vigenere(encryption, custom_key, 'decrypt')
# print('Decrypted text:', decryption)
2

reset the step and do only what directed:

Add a third parameter called direction to your function definition.

You don’t have to do anything else than that

3

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