Event事件

Event事件，event.wait()可以设置超时时间，超过这个时间，就算没有发送信号，也将执行其他任务

from threading import Thread,Event
import time
event=Event()
def student(name):
    print("学生%s正在听课" % name)
    event.wait()
    print("学生%s正在休息" % name)

def teacher(name):
    print("老师%s正在授课" % name)
    time.sleep(7)
    event.set()
if __name__=="__main__":
    stu1=Thread(target=student,args=("ya",))
    stu2=Thread(target=student,args=("w",))
    stu3=Thread(target=student,args=("l",))
    teh1=Thread(target=teacher,args=("Teacher",))
    stu1.start()
    stu2.start()
    stu3.start()
    teh1.start()

Event使用，一个线程对服务端进行检测，检测通过后发送事件通知其他线程进行连接

from threading import Thread,Event,currentThread
import time
event=Event()
# event.clear()#恢复event的状态值为False
def conn():
    n=0
    while not event.is_set():#判断是否被设置
        if n==3:
            print("%s try too many times"% currentThread().getName())
            return
        print("%s is try %s" % (currentThread().getName(),n))
        event.wait(0.5)#设置等待超时时间
        n+=1
    print("%s is connected" % currentThread().getName())
def check():
    print("%s is checking" % currentThread().getName())
    time.sleep(5)
    event.set()#设置
if __name__=="__main__":
    for i in range(3):
        t=Thread(target=conn)
        t.start()
    t=Thread(target=check)
    t.start()