human
Write me a Python code to print p given the following:
I wrote the below code

    def cb(obj, data, sec, usec, length):
        p = pkt.ethernet(data)
        print p.dump()
    if interface.startswith('#'):
        interface = int(interface[1:])
        interface = PCap.get_device_names()[interface]
    p = PCap(interface, callback=cb, start=False)
    p.set_direction((not no_incoming), (not no_outgoing))
    p.start()

What's a good function header?
assistant
#Here is Python code to print p.

def launch(interface, no_incoming=False, no_outgoing=False):