Print out multitask PING, TRACERT in WxPython same time

Question

I use wx.Yield to send the ping results to our text control in real time. But I get just the results until ping had finished running.

def pingIP(self, ip):
    proc = subprocess.Popen("ping %s" % ip, shell=True, 
                            stdout=subprocess.PIPE) 
    print
    while True:
        line = proc.stdout.readline()                        
        wx.Yield()
        if line.strip() == "":
            pass
        else:
            print line.strip()
        if not line: break
    proc.wait()

I want to Print out multitask PING, TRACERT in WxPython same time Any advise? Thanks