Tell us what’s happening:
The task is the following:
Step 61
Next, inside the else block, declare a variable called key_char and assign it the value of key at the index key_index mod(%) the length of key.
and I added the following expression:
key_char = key[key_index] % key.len
I also tried key[key_index % key.len]
but neither works, can you please help me?
Your code so far
text = 'Hello Zaira'
custom_key = 'python'
def vigenere(message, key):
key_index = 0
alphabet = 'abcdefghijklmnopqrstuvwxyz'
encrypted_text = ''
for char in message.lower():
# User Editable Region
# Append space to the message
if char == ' ':
encrypted_text += char
else:key_char = key[key_index] % key.len
# User Editable Region
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 61
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