Learn String Manipulation by Building a Cipher - Step 57

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cannot understand what it is asking me to do…

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# User Editable Region

text = 'Hello Zaira'
shift = 3

def caesar(message, offset):
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    encrypted_text = ''

    for char in message.lower():
        if char == ' ':
            encrypted_text += char
        else:
            index = alphabet.find(char)
            new_index = (index + offset) % len(alphabet)
            encrypted_text += alphabet[new_index]
    print('plain text:', message)
    print('encrypted text:', encrypted_text)

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 57

Step No: 57 of the Learn String Manipulation by Building a Cipher - Step 57, requires you to modify the function such that the name of the function is change from caesar to vigenere and the second parameter changed from offset to key

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I changed the function to vigenere and the 2nd parameter to key, but it still shows error