方法一：
pip install netaddr
from netaddr import *
mac = EUI(0x05056bdafc)
print (mac)
mac.dialect = mac_unix
print (mac)
方法二：
from pysnmp.smi import builder
mibBuilder = builder.MibBuilder()
MacAddress, = mibBuilder.importSymbols('SNMPv2-TC', 'MacAddress')
macAddress = MacAddress(hexValue='05056bdafc'.zfill(12))
macAddress.prettyPrint()
方法三：
mac = '05056bdafc'.zfill(12)
':'.join([ mac[i:i+2] for i in range(0, 12, 2) ])
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