human
I wrote the below code

    (dsp, rd) = os.popen2((sox_base % ''))
    def play(pkt, dsp=dsp):
        if (pkt and pkt.haslayer(UDP) and pkt.haslayer(RTP)):
            dsp.write(pkt.getlayer(RTP).load)
    try:
        if (lst is None):
            sniff(store=0, prn=play, **kargs)
        else:
            for p in lst:
                play(p)
    finally:
        try:
            dsp.close()
            rd.close()
        except:
            pass

What's a good function header?

Here's a good function header?
assistant
#Here's a good function header.

def voip_play3(lst=None, **kargs):