python 多线程远程执行命令

如题，代码如下：

import paramiko,threading,sys,time,osclass SSHThread(threading.Thread):    def __init__(self, ip, port,user,pwd,timeout,cmd):        threading.Thread.__init__(self)        self.ip = ip        self.port = port        self.user = user        self.pwd = pwd        self.timeout = timeout        self.cmd = cmd        self.LogFile = "/home/linxw/temp/test.log"    def run(self):        print("Start try ssh => %s" % self.ip)        try:            ssh = paramiko.SSHClient()            ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())            ssh.connect(self.ip, self.port, username=self.user, password=self.pwd, timeout=self.timeout)            print("[%s] Login %s => %s " % (self.ip, self.user, self.pwd))            open(self.LogFile, "a").write("[ %s ] IP => %s, port => %d, %s => %s" % (time.asctime( time.localtime(time.time()) ), self.ip, self.port, self.user, self.pwd))            print("[%s] exec : %s" % (self.ip,self.cmd))            open(self.LogFile,"a").write("[%s] exec : %s" % (self.ip,self.cmd))            stdin,stdout,stderr = ssh.exec_command(self.cmd)            print("[%s] exec result : %s" % (self.ip,stdout.read()))            return True        except:            print("[%s] Error %s => %s" % (self.ip, self.user, self.pwd))            open(self.LogFile, "a").write("[%s] Error %s => %s" % (self.ip, self.user, self.pwd))            return Falsedef ViolenceSSH(ip, port,user,pwd,timeout,cmd):    ssh_scan = SSHThread(ip, port, user, pwd, timeout,cmd)    ssh_scan.start()if __name__ == '__main__':    ipList = ['192.168.163.128','127.0.0.1']    for ip in ipList:        threading.Thread(target = ViolenceSSH, args = (ip, 22,'root','1234',3,'uptime' )).start()