import random
users={"张三":"1234","李四":"1224","王五":"wwangwu"}
count=3
for i in range(1, 4):
    if count==0:
        break
    code=random.randint(1000,9999)
    print("验证码为",code)
    iptcode=int(input("请输入验证码:"))
    if code!=iptcode:
        print("验证码错误")
        break
    else:
        account = input("请输入账号：")
        password = input("请输入密码：")
        if account  in users.keys() and password == users.get(account):
            print("你已经成功登陆，欢迎进入凯里学院！")
            break
        else:
            count -= 1
            print("账号或密码不匹配,你还有"+str(count)+"次机会")