curriculum/challenges/english/blocks/learn-string-manipulation-by-building-a-cipher/6554e0adc7bb193cbfdb36d5.md
Check if the function can decrypt the string back to the plain text.
Declare another variable called decryption and assign it vigenere(encryption, custom_key, -1).
You should call vigenere passing encryption, custom_key and -1 as the arguments.
({ test: () => assert.match(code, /vigenere\s*\(\s*encryption\s*,\s*custom_key\s*,\s*-\s*1\s*\)/) })
You should declare a decryption variable.
({ test: () => assert(__userGlobals.has("decryption")) })
Your decryption variable should have the value of vigenere(encryption, custom_key, -1).
({ test: () => assert.match(code, /^decryption\s*=\s*vigenere\s*\(\s*encryption\s*,\s*custom_key\s*,\s*-\s*1\s*\)/m) })
text = 'Hello Zaira'
custom_key = 'python'
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)
--fcc-editable-region--