Learn String Manipulation by Building a Cipher - Step 75

Tell us what’s happening:

Describe your issue in detail here.
I can’t seem to understand if I need to add more onto the if statement like seen in other people’s problems or if I need to something small to it for it to run not sure if I’m just being blind here

Your code so far

text = 'Hello Zaira!'
custom_key = 'python'

def vigenere(message, key, direction=1):
    key_index = 0
    alphabet = 'abcdefghijklmnopqrstuvwxyz'
    final_message = ''

    for char in message.lower():

/* User Editable Region */

        # Append space to the message
        if char.isalpha() == True:
            final_message += char

/* User Editable Region */

            # 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)
decryption = vigenere(encryption, custom_key, -1)

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Learn String Manipulation by Building a Cipher - Step 75

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Hello ioanrichards90,

So the .isalpha() method is a method that checks whatever char or string it’s called on and it will return True or False depending on if the char is indeed a letter.

If char is a letter that entire part will just be True so basically your if statement is either: if True == True or if False == True. Which you know, would work. But instead just knowing if isalpha returns True or False is enough. Because if that method returns True we know it’s a letter.

im still stuck as I understand that it isalpha checks if all letters but I still don’t understand what to write to get the code to run, this Is what I tried but didn’t work can you let me know if I’m close or on the right track

if char.isalpha() == True:
if True == True
if False == True

Your if statement needs to check if char is a letter. If it is then it needs to run the code.

This works, but it’s redundant, too long. Comparing True to True. You can shorten that.

thank you I’ve got it now don’t know how I didn’t get that one haha

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