python中怎么调用线程

from threading import Thread

import time

def sayhi(name,input,number):

    for i in range(1,10):

        if number == "线程号1":

            time.sleep(2)

            print("这是线程号：%s - %s say hello %s - %s" % (number,name, str(i),input))

        else :

            time.sleep(1)

            print("线程号：%s - %s say hello %s - %s 休息1秒" % (number,name, str(i),input))

if __name__ == '__main__':

    for i in range(1,3):

        t = Thread(target=sayhi, args=('mike','to you',"线程号"+str(i) ))

        t.start()

    print("主线程结束")

# -*- coding: utf-8 -*-

import time

from threading import Thread

def doWork(input):

    global interval

    try:

        print("begin")

        if "DERNAV" in input.upper():

            t = Thread(target=Th1, args=(input,))

            t.start()

        elif "PBD9008" in input.upper():

            t = Thread(target=Th2, args=(input,))

            t.start()

    except Exception as e :

        print(e)

def Th1(input):

    for i in range(1,10):

        print(input+"_"+time.strftime('%Y.%m.%d %H:%M:%S'))

        time.sleep(1)

def Th2(input):

    for i in range(1,10):

        print(input+"_"+time.strftime('%Y.%m.%d %H:%M:%S'))

        time.sleep(2)

 def run(interval):

    while True:

        try:

            doWork("PBD9008")

            doWork("DERNAV")

            time_remaining = interval - time.time() % interval

            time.sleep(time_remaining)

        except Exception as e:

            print(e)

if __name__ == '__main__':

    global interval

    interval = 300

    text = run(interval)