data = b'hello!'
>>> ''.join(['{:02x}'.format(b) for b in data])
'68656c6c6f'

转换成标准bytes的b’\xaa\xb1’转换为HEX

import binascii

mac_bytes = b'\xacg\xb27-\xcc'
mac_str = binascii.hexlify(mac_bytes).decode()
print(mac_str)

ac67b2372dcc