115-python-多线程-事件

import time
import random
from threading import Thread,Event

def connect_db(e):
    count = 0
    while count < 3:
        e.wait(0.5)
        if e.is_set() == True:
            print('链接数据库')
            break
        else:
            count += 1
            print('第%s次连接失败'%(count))
    else:
        raise TimeoutError('连接超时..')


def check_web(e):
    time.sleep(random.randint(2,3))
    e.set()

e = Event()
t1 = Thread(target=connect_db,args=(e,))
t2 = Thread(target=check_web,args=(e,))
t1.start()
t2.start()