Example of using scapy+gobject to sniff packets.

scapy_gobject.py

import gobject
from scapy.all import *

loop = gobject.MainLoop()

ethernet1 = conf.L2listen(type=ETH_P_ALL, iface='eth0')

def ethernet1_handler(packet):
    return packet.summary()
	
def doTheSniff(source, condition):
	print "Worked"
	return sniff(prn=ethernet1_handler, store=0, count=1)

gobject.io_add_watch(ethernet1, gobject.IO_IN, doTheSniff or True)

loop.run()