curriculum/challenges/english/blocks/learn-string-manipulation-by-building-a-cipher/65551a628bcb7e121e32d04b.md
Right now, punctuation, special characters or digits are not encoded/decoded correctly.
Check this by adding an exclamation mark at the end of the text string.
You should have a text variable.
({ test: () => assert(__userGlobals.has("text")) })
Your text variable should be equal to the string 'Hello Zaira!'.
({ test: () => assert.equal(__userGlobals.get("text"), "Hello Zaira!") })
--fcc-editable-region--
text = 'Hello Zaira'
custom_key = 'python'
--fcc-editable-region--
def vigenere(message, key, direction=1):
key_index = 0
alphabet = 'abcdefghijklmnopqrstuvwxyz'
final_message = ''
for char in message.lower():
# Append space to the message
if char == ' ':
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
encryption = vigenere(text, custom_key)
print(encryption)
decryption = vigenere(encryption, custom_key, -1)
print(decryption)