Learn String Manipulation by Building a Cipher - Step 83

Python
1

Tell us what’s happening:

Describe your issue in detail here.

Your code so far

text = 'mrttaqrhknsw ih puggrur'
custom_key = 'python'

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

    for char in message.lower():

        # Append any non-letter character to the message
        if not char.isalpha():
            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

def encrypt(message, key):
    return vigenere(message, key)
    
def decrypt(message, key):
    return vigenere(message, key, -1)

# User Editable Region

encryption = encrypt(text, custom_key)
print('Encrypted text:')
decryption = decrypt(encryption, custom_key)


# User Editable Region

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Challenge Information:

Learn String Manipulation by Building a Cipher - Step 83

2

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.

3

Hey, what kind of help do you need?

4

Hello Sir, I tried running the code as per the Instructions given to me, but I’m unable to get the output despite trying multiple times could you please help me with it?

5

Step 83 says:

Delete the pass keyword, and return vigenere(message, key) from your new function.

You posted a code that contains other lines from the following steps. The project has been updated few hours ago so I don’t know exactly what step you are referring to.

6

okay Sir let me try it once and I’ll get back to you

7

text = ‘mrttaqrhknsw ih puggrur’
custom_key = ‘python’

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

for char in message.lower():

    # Append any non-letter character to the message
    if not char.isalpha():
        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

def encrypt(message, key):
return vigenere(message, key)

def decrypt(message, key):
return vigenere(message, key, -1)
encryption = encrypt(text, custom_key)
print(“Encrypted text:”, " " +text)
decryption = decrypt(encryption, custom_key)
print(decryption)

Step: 83
Two or more strings can be concatenated by using the + operator. For example: 'Hello' + ' there!' results in 'Hello there!.

Modify print(encryption) to print Encrypted text: mrttaqrhknsw ih puggrur. Use the + operator to concatenate text to your string and pay attention to the spacing.

Sir, after multiple attempts of trying, I’m not getting it, could you please help me with it

8

Hey @somadharanidhar, could you share what you’ve tried so far?

9

You need to do it concatenating a string and the text variable. For example:
print('string' + text)

10

tried it but it did not work I even tried str(“Value”) + text still it did not work

11

Please, share the updated code.

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print(str(“Encrypted text:”), " " +text)

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*** SOLUTION REMOVED *****************

14

Glad you solved it! Please don’t share the solution code, thank you!

15

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