Can’t get the bip32masterkey from mnemonic seed (Python)

I’m trying to understandand implement the functioning of Hierarchical deterministic wallets.
But I can’t get the bip32masterkey
based on this tutorial : https://medium.com/mycrypto/the-journey-from-mnemonic-phrase-to-address-6c5e86e11e14

this mnemonic seed : 0x77cdf1d92225adc0e67b1b4f5a31820251d518b3af074df25a07b751947fd07ebd29a4d0e57b84ea9de03a9123e2a6ea1e3ed739d4c562efec21f1bb0a54a879

should give me this bip32masterkey : 0x300b155f751964276c0536230bd9b16fe7a86533c3cbaa7575e8d0431dbedf23f9945bb8b052bd0b0802c10c7c852e7765b69b61ce7233d9fe5a35ab108ca3b6

but instead I have : 0x11df5cd2d2095dde0a46a8de0c2aba91a565e16dd0e5877d21285e605659d587bd3b3c72cba372ecf3b26fdf27151d9dc5d9f341760784cb04540f95d193c383

here’s the code i’m using :

def get_bip32masterkey(seed):
    master_key = pbkdf2_hmac("SHA512", bytes(binascii.a2b_hex(seed)), bytes("Bitcoin seed".encode()), 1).hex()
    return (master_key)

I also tried with hmac instead of pbkdf2 but I cant get the right bip32masterkey, does someone see the point i’m missing ?

(I’m not a python dev I’m just trying to understand the basis)

Thank you in advance to all for your answers