python 多线程

import threading
import time
from threading import Lock
class Mythread(threading.Thread):#继承与重写多线程
    def __init__(self,num):
        threading.Thread.__init__(self)
        self.num=num
        self.lock = Lock()

    def run(self):
        with self.lock:
            self.func()


    def func(self):
        self.num += 1
        time.sleep(1)
        self.num -= 1
        print('I am', self.num)




for i in range(100):
    mythread = Mythread(0)
    mythread.start()
    print(mythread.isAlive())  #查看线程存活状态
    mythread.join()



class mythread1(threading.Thread):
    def __init__(self,threadname):
        threading.Thread.__init__(self,name=threadname)
    def run(self):
        global event
        if event.isSet():  
            event.clear()  #清除
            event.wait()   #等待被设置
            j=self.getName()
            print(j)
        else:
            p=self.getName()
            print(p)
            event.set()  #设置
event=threading.Event()  #生成事件
event.set()  #设置为True
t1=[]
for i in range(10):
    t=mythread1(str(i))
    t1.append(t)

for i in t1:
    i.start()