lookup mac addresses in the oui database

lookupmac.py

ouifilename = "oui.txt"
with open(ouifilename) as ouifile:
    macassignments = {}
    for i in ouifile.readlines()[0::]:
        i = i.strip()
        if "(hex)" in i:
            fields = i.split("\t")
            macprefix = fields[0][0:8].replace("-", ":").lower()
            entity = fields[2]
            macassignments[macprefix] = entity

with open("lmacs.csv") as macs:
    pmacs = macs.read().splitlines()

for mac in pmacs:
    cmac = mac[0:8].lower()
    if cmac in macassignments:
        print("{0} {1}".format(mac, macassignments[cmac]))