FNAME = "ifconfig.txt"

ADAPTERS = dict()

with open(FNAME) as fid:
    for linenumber, line in enumerate(fid):
        if line[0] is not " ":
            # if ("ether" in line) or ("HWaddr" in line):
            #     print(line)
            infos = line.split()
            if(infos and
               "lo" not in infos[0] and
               "tun" not in infos[0]):
                adapter, mac = infos[0], infos[4]
                # print(linenumber, adapter, mac)
                print(infos)
                ADAPTERS[adapter] = mac

FNAME_BASE = FNAME[:FNAME.rfind(".txt")]
FNAME_OUT =  FNAME_BASE + "_adapters.txt"
FNAME_OUT2 = FNAME_BASE + "_adapters_changed.txt"

with open(FNAME_OUT, "w") as fid:
    for adapter, mac in ADAPTERS.items():
        fid.write("Adapter: " +  adapter + ", MAC: " + mac + "\n")

BASEMAC = "01:23:45:ff:00:"
with open(FNAME_OUT2, "w") as fid:
    for i, (adapter, mac) in enumerate(ADAPTERS.items()):
        mac_changed = BASEMAC + "%02x" %(i+1)
        mac_changed = BASEMAC + "{0:02x}".format((i+1))
        fid.write("Adapter: " +  adapter + ", MAC: " + mac_changed + "\n")