ctypeslib converted libnfc and libfreefare with just enough of the interals to actually be usable.
sudo apt install libfreefare0 pip install pynfc
from pynfc import Nfc, Desfire, Timeout
n = Nfc("pn532_uart:/dev/ttyUSB0:115200")
DESFIRE_DEFAULT_KEY = b'\x00' * 8
MIFARE_BLANK_TOKEN = b'\xFF' * 1024 * 4
for target in n.poll():
try:
print(target.uid, target.auth(DESFIRE_DEFAULT_KEY if type(target) == Desfire else MIFARE_BLANK_TOKEN))
except Timeout:
pass