import time

 from threading import Thread

 class MyThread(Thread):

     def __init__(self,arg):

         super().__init__()

         self.arg = arg

     def run(self):

         time.sleep(1)

         print(self.arg)

 t = MyThread(10)

 t.start()

 import os

 import time

 from threading import Thread

 #多线程并发

 def func(a,b):

     global g

     g = 0

     n = a+b

     print(n,os.getpid())

 g = 100

 t_lst = []

 #i的值的范围是0--9

 for i in range(10):

     t = Thread(target=func,args=(i,5))

     t.start()

     t_lst.append(t)

 for t in t_lst:t.join()

 print(g)