python pcie回环 python 回显

python得到命令执行状态，实现回显，代码如下：

try:
    if cmd!="":
        if huix==True:
            if timex == 0:
                logps=sups.Popen(cmd,shell=True,stdout=sups.PIPE,close_fds=True)
                while logps.poll() is None:
                    logpsl=logps.stdout.readline()
                    if logpsl!=None:
                        self.bjk0.AppendText(logpsl)
                    else:
                        break
            else:
                logps = sups.Popen(cmd,shell=True,stdout=sups.PIPE,close_fds=True)
                start = datetime.datetime.now()
                while logps.poll() is None:
                    now = datetime.datetime.now()
                    if (now-start).seconds > timex:
                        logps.kill()
                        self.bjk0.AppendText("  命令操作已超时。\n")
                        break
                    logpsl = logps.stdout.readline()
                    if logpsl != None:
                        self.bjk0.AppendText(logpsl)
                    else:
                        break
        else:
            if timex==0:
                sups.run(cmd,shell=True)
            else:
                sups.run(cmd,shell=True,timeout=timex)
except:
    self.bjk0.AppendText('  已取消命令操作。\n')
    pass