• 尝试3次连接数据库

import time

import random

from threading import Thread,Event

def connect_db(e):

    count = 0

    while count <3:

        e.wait(0.5) #状态为False的时候,等待1秒结束

        if e.is_set() == True:

            print('连接数据库')

            break

        else:

            count += 1

            print('第%s连接失败'%count)

    else:

        raise TimeoutError('数据库连接超时')

def check_web(e):

    time.sleep(random.randint(0,3))

    e.set()

e = Event()

t1 = Thread(target=connect_db,args=(e,))

t2 = Thread(target=check_web,args=(e,))

t1.start()

t2.start()