from threading import Thread
from time import sleep, time


def func():
    global count
    for i in range(10000):
        count += 1


count = 0
start = time()
# for i in range(10):
#     t = Thread(target=func)
#     t.start()
# print(f"count = {count}")
for i in range(10):
    func()
print(f"count = {count}")
end = time() - start
print(end)

老师，注释内容和后续循环都能正确打印出结果，但是我发现打印出来的时间反而是多线程耗时更多一点，多次运行后发现要么是多线程运行耗时多，要么二者速度差不多。这样的话Python的多线程还有什么意义呢，没感觉到效率的提升啊。

if not fragment

    break

解释成：“如果读到了末尾， break”

该怎么理解

class Employee:
    __init_flag=True

    def __init__(self,id,name,salary):
        self.id = id
        self.name=name
        self.__salary=salary

    def __add__(self, other):    #+运算符重载
        if isinstance(other,Employee):
            return self.__salary+other.__salary   #两个对象相加时，返回薪水和
        else:
            print('两个雇员不属于一个公司，不能相加')

    @property
    def salary(self):
        return self.__salary

    @salary.setter
    def salary(self,salary):
        if (1000<salary<50000):   #限制薪水范围
            self.__salary=salary
        else:
            print('薪水录入错误，请重新录入')

    def input(self):
        d=1000
        if self.id=='':  #当不输入id时
            if Employee.__init_flag:
                self.id=1000   #给第一个员工id为1000
                Employee.__init_flag=False
                return self.id
            else:
                d+=1    #给第二个员工及之后的员工id加1
                self.id=d
                return self.id
        else:            #当输入id时
            return self.id

e3=Employee('','小李',5500)
e4=Employee('','小刘',38000)
print(e3.input())
print(e4.input())    #当不输入id时，雇员id依次递增

e1=Employee(1007,'小王',4500)
e2=Employee(1008,'小张',6000)
print(e1+e2)     #两个雇员相加时，返回薪水和

e5=Employee(1009,'小蒙',-900)
print(e5.salary)

运算结果e5.salary是负值：-900，为什么不是判断“薪水录入错误，请重新录入”，我看到提问区有个小伙伴的问题跟我一样，但是老师的回答没看懂，麻烦老师解答，谢谢

老师，我调试了好久还是没能找到问题！上面是我调试图片！

老师，前端这节不学，直接后台开发步骤，影响后面的操作吗

我按照下面的更新了，却一直在提示黄色字体，那还有怎么办

我按照下面的更新了，却一直在提示黄色字体，那还有怎么办

老师您好：请问我这是怎么回事？安装的界面跟老师的不同，然后是安装不了的。

public void mothod(T...args){ for (T t:args) { System.out.println(t); } 老师给解释一下这个T...args和t：args，看不懂

老师，try catch里面如果出现异常，下面的new SqlSessionFactoryBuilder().build(is)还会执行吗？

为什么？

<!--页脚开始-->
<div class="footer">
    <div class="wrap">
        <div class="footer-seriver">
            <ul>
                <li>
                    <a href="#">
                    <i class="iconfont">&#xe629;</i>
                        <span>预约维修服务</span>
                    </a>
                </li>
                <li>
                    <a href="#">
                        <i class="iconfont">&#xe60e;</i>
                        <span>7天无理由退货</span>
                    </a>
                </li>
                <li>
                    <a href="#">
                        <i class="iconfont">&#xe606;</i>
                        <span>15天免费换货</span>
                    </a>

                </li>
                <li>
                    <a href="#">
                        <i class="iconfont">&#xe624;</i>
                        <span>满99元包邮</span>
                    </a>

                </li>
                <li>
                    <a href="#">
                        <i class="iconfont">&#xe617;</i>
                        <span>520余家售后网点</span>
                    </a>

                </li>
            </ul>
        </div>
        <div class="footer-link">
            <ul>
                <li>帮助中心</li>
                <li><a href="">账户管理</a></li>
                <li><a href="">购物指南</a></li>
                <li><a href="">订单操作</a></li>
            </ul>
            <ul>
                <li>帮助中心</li>
                <li><a href="">账户管理</a></li>
                <li><a href="">购物指南</a></li>
                <li><a href="">订单操作</a></li>
            </ul>
            <ul>
                <li>帮助中心</li>
                <li><a href="">账户管理</a></li>
                <li><a href="">购物指南</a></li>
                <li><a href="">订单操作</a></li>
            </ul>
            <ul>
                <li>帮助中心</li>
                <li><a href="">账户管理</a></li>
                <li><a href="">购物指南</a></li>
                <li><a href="">订单操作</a></li>
            </ul>
            <ul>
                <li>帮助中心</li>
                <li><a href="">账户管理</a></li>
                <li><a href="">购物指南</a></li>
                <li><a href="">订单操作</a></li>
            </ul>
            <ul>
                <li>帮助中心</li>
                <li><a href="">账户管理</a></li>
                <li><a href="">购物指南</a></li>
                <li><a href="">订单操作</a></li>
            </ul>
            <div class="footer-aside">
                <p class="tel">400-100-5678</p>
                <p class="time">8:00-18:00（仅收市话费</p>
                <a href="#" class="kefu">人工客服</a>
                <div class="follow">
                    关注小米：
                    <img src="image/wb.png" alt=""/>
                    <img src="image/wx.png" alt=""/>
                </div>

            </div>

        </div>
    </div>

</div>

老师我就想问下，在页脚最后右边的最后一排字“关注小米”这点本来我自己想的是用p标签，然后给嵌套两个a标签，然后在在a标签里给两个img

后面看到视频中老师用的div，我就想问下，最后一排为什么要用div上面三排出了有个用的a标签，其他都是用的p标签来写的，为什么最后这一点要用div

编写一个函数，计算下面的数列

这道题用什么形式的数据虚幻还是定义

不会写

<!--主体开始-->
<div class="cantent">
    <div class="wrap">
        <!--手机开始-->
        <div class="phone">
            <h3 class="title">手机</h3>
            <div class="phone-box">
                <div class="phone-box-left">
                    <a href="#">
                        <img src="image/cb1bd61ad71c45a4f67f09b075463944.jpeg" alt=""/>
                    </a>
                </div>
                <div class="phone-box-right">
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                    <div class="items1">
                        <a href="#">
                            <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/b3553083a4975325eab6470d94465548.jpg?thumb=1&w=120&h=120" alt=""/>
                            <p class="name2">小米10s</p>
                            <p class="name3">骁龙870 | 对称式双扬立体声</p>
                            <p class="name4">3299元起</p>
                        </a>
                    </div>
                </div>
            </div>
            <div class="big-img">
                <a href="#">
                    <img src="https://cdn.cnbj1.fds.api.mi-img.com/mi-mall/41d16e66381cfeda7b6b39ab67678d5e.jpg?thumb=1&w=736&h=72" alt=""/>
                </a>
            </div>
        </div>
        <!--手机结束-->
    </div>
</div>
<!--主体结束-->


css
/*主体开始*/
.cantent{
    width: 100%;
    /*自动找高*/
    overflow: hidden;
    padding: 4px 0 12px;
    background-color: #f5f5f5;
}
.title{
    text-align: left;
    color: #333;
    font-size: 22px;
    font-weight: 200;
    line-height: 58px;
}
.phone-box{
    width: 100%;
    height: 614px;
}
.phone-box-left{
    width: 234px;
    height: 614px;
    float: left;
    transition: all .2s linear;
    box-sizing: border-box;
}
.phone-box-right{
    width: 992px;
    height: 614px;
    /*background-color: deepskyblue;*/
    float: left;


}
.phone-box-left img{
    width: 100%;
    height: 100%;
}
.items1{
    width: 234px;
    height: 282px;
    padding: 20px 0;
    margin: 0 0 14px 14px;
    background-color: #fff;
    float: left;
    transition: all .2s linear;
    /*box-sizing: border-box;*/
}
.items1 img{
    width: 160px;
    height: 160px;
    margin-bottom: 18px; ;
}
.name2{
    width: 214px;
    height: 20px;
    color: #333;
    font-size: 14px;
    line-height: 21px;
    margin: 0 10px 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.name3{
    width: 214px;
    height: 18px;
    font-size: 12px;
    color: #b0b0b0;
    margin: 0 10px 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.name4{
    width: 214px;
    height: 21px;
    color: #ff6700;
    margin: 0 10px 14px;
    font-size: 14px;
}
.phone-box-left:hover{
    box-shadow: 0 15px 30px rgba(0,0,0,.1);
    transform: translate(0,-2px);
}
.items1:hover{
    box-shadow: 0 15px 30px rgba(0,0,0,.1);
    transform: translate(0,-2px);
}
.big-img{
    width: 100%;
    height: 120px;

 }
.big-img img{
    width: 1226px;
    height: 120px;
    margin: 22px 0;
}

老师 我已经遇见过好几次这种情况了，代码没问题，但就是不显示，去浏览器检索了也有，但就是显示不出来，空白一片，这到底是bug？还是什么问题，求老师解答下！！感谢

老师好，为什么在upper中列明不需要加单引号，而在initcap中则需要单引号啊