curriculum/challenges/english/blocks/learn-string-manipulation-by-building-a-cipher/6554e343caea913ffba7bec6.md
Now, your function can be used both to encrypt and decrypt a message. Clean up your code with better variable names.
Change each occurrence of encrypted_text into final_message.
You should change each occurrence of encrypted_text into final_message.
({
test: () => {
const l = code.match(/final_message/g).length
assert.equal(l, 4)
}
})
text = 'Hello Zaira'
custom_key = 'python'
--fcc-editable-region--
def vigenere(message, key, direction):
key_index = 0
alphabet = 'abcdefghijklmnopqrstuvwxyz'
encrypted_text = ''
for char in message.lower():
# Append space to the message
if char == ' ':
encrypted_text += char
else:
# Find the right key character to encode
key_char = key[key_index % len(key)]
key_index += 1
# Define the offset and the encrypted letter
offset = alphabet.index(key_char)
index = alphabet.find(char)
new_index = (index + offset*direction) % len(alphabet)
encrypted_text += alphabet[new_index]
return encrypted_text
--fcc-editable-region--
encryption = vigenere(text, custom_key, 1)
print(encryption)
decryption = vigenere(encryption, custom_key, -1)
print(decryption)