Need help with encryption and decryption in Python

You will design these modules:

(C, IV)= Myencrypt(message, key):

In this method, you will generate a 16 Bytes IV, and encrypt the message using the key and IV in CBC mode (AES). You return an error if the len(key) < 32 (i.e., the key has to be 32 bytes= 256 bits).

(C, IV, key, ext)= MyfileEncrypt (filepath):

In this method, you'll generate a 32Byte key. You open and read the file as a string. You then call the above method to encrypt your file using the key you generated. You return the cipher C, IV, key and the extension of the file (as a string).

I also decrypted modules to go with the above modules