Bip39 buffer is not defined https://www.slideserve.com/lewarthbfp/getting-a-bip39-phrase-in-python-a-comprehensive-tutorial BIP85: A newer proposal allowing for the deterministic derivation of a number of BIP39 mnemonic seeds from the master seed. Thanks to the cryptographic structure of BIP-39, a weak passphrase does not lessen the security of the other wallets or assist expose the seed https://mariobrpx591.cavandoragh.org/getting-a-bip39-phrase-in-python-a-comprehensive-tutorial