老师这个红框里面这个方法参数，是怎么理解，不太理解是什么意思？不同类型方法的我怎么确认具体的参数是什么类型

老师图中的这两个地方，执行顺序是怎样的啊，代码在加载的时候不是从上向下执行吗   为什么这里是先通过ServletContext.getAttrrbute()取值没报错呢，，然后在下面才通过ServletContext.setAttribute()完成赋值的，这里能详细解释一下吗，谢谢

代码

from tkinter import *
from tkinter import messagebox
from random import randint


class Application(Frame):

    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.pack()

    def creat_weight(self):
        self.label = Label(self, text="生成的数字").grid(row=0, column=0)

        self.text1 = Text(self, width=20, height=1, bg="gray", font=("黑体", 30)).grid(row=0, column=1)

        self.label2 = Label(self, text="输入你的数字").grid(row=1, column=0)

        v2 = StringVar()
        self.entry2 = Entry(self, textvariable=v2, font=("黑体", 30)).grid(row=1, column=1)

        self.btn1 = Button(self, text="生成数字", command=self.randint1).grid(row=2, column=1, sticky=W)

        self.btn2 = Button(self, text="—确定—", command=self.judge).grid(row=2, column=1)

    def randint1(self):
        self.text1.delete(1.0, END)
        num = randint(100000, 999999)
        self.text1.insert(1.7, str(num))

    def judge(self):
        if int(self.entry2.get()) == int(self.text1.get(1.7, END)):
            messagebox.showinfo("提示", "right")
        else:
            messagebox.showinfo("提示", "wrong")

        print(self.text1.get(1.7, 1.13))
        print(self.entry2.get())


if __name__ == '__main__':
    root = Tk("entry_test")
    root.geometry("500x300+200+100")
    app = Application(master=root)
    app.creat_weight()
    root.mainloop()

运行截图

按下  生成数字之后出现下列错误

public class AddBatchTest {
    public void addBatch2(){
        Connection connection=null;
        PreparedStatement ps=null;
        try{
            connection=JdbcUtil.getConnection();
            ps=connection.prepareStatement("insert into users values(default,?,?)");
            for(int i=1;i<=854;i++){
                ps.setString(1,"itbz"+i);
                ps.setInt(2,20);
                //缓存sql
                ps.addBatch();
                if(i%500==0){
                    ps.executeBatch();//执行sql语句
                    //清楚缓存
                    ps.clearBatch();
                }
            }
            ps.executeBatch();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            JdbcUtil.closeResource(ps,connection);
        }
    }
    public static void main(String[] args) {
        AddBatchTest at=new AddBatchTest();
        at.addBatch2();
    }
}

老师，比如我这里添加854条信息，如果还是要500一缓存，是不是还需要在循环外面再加一个ps.executeBatch();，或者有没有其他方法呢？

接口文档能不能上传一下，在下载的资料中没有，还有这些软件工具之类的。目前有01的

老师，现在swagger升级到3.0 了使用上，我直接添加3.0版本依赖出不来…… 课程该更新了

老师您好，创建ArryList的时候后面的<>，添加与否都能正常执行代码，这个有具体格式的要求吗？是否一定需要使<>。另外collection后面的<>取消了也可以执行。

public class Test {
    public static void main(String[] args) {
      Collection<String> list=new ArrayList<>();
        list.add("a");
        list.add("b");
        Iterator<String> ite=list.iterator();
        while(ite.hasNext()){
            String str= ite.next();
            System.out.println(str);
        }
    }
}

老师，我模仿你分别下载两份克隆给u1, u2.

然后u1修改了a.info然后push.

接着u2也修改了a.info，运行git add . , 紧接着git pull, 显示如下：

但是，u2用vim打开a.info, 并没有出现变化提示，这是为什么呢？

老师，什么是“引用”？

在Python 中引用是 动词还是名词？

其他的模块很好安装，就这个就安装不上，是怎么回事么

在mac下会报错 没有join的情况，为什么报如下的错误:

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

Traceback (most recent call last):

      File "<string>", line 1, in <module>

exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/spawn.py", line 126, in _main

    self = reduction.pickle.load(from_parent)

  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/multiprocessing/synchronize.py", line 110, in __setstate__

    self._semlock = _multiprocessing.SemLock._rebuild(*state)

FileNotFoundError: [Errno 2] No such file or directory

安装这块讲太快了，我输入11提示未找到命令，输入wget也是未找到命令

老师，注册快代理账号的时候需要实名认证，这个会泄露隐私吗？

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>原型</title>
</head>
<body>
<script>
    /*
    //原型
    function func() {}
    func.prototype.name = '张三';
    func.prototype.age=18;
    func.prototype.sex='男';
    var obj= new func();
    console.log(obj);

    function People(){}
    //console.log(People.prototype.constructor);
    console.log(People.prototype);
    var beixi=new People();
    console.log(beixi.__proto__);
*/
    function  People(){}
    var peo1=new People();
    var peo2=new People();

    People.prototype.frineds=['张三','李四','王五','找刘'];
    peo1.frineds.pop();
    console.log(peo1.frineds);
    console.log(peo2.frineds);
</script>
</body>
</html>

为什么我的俩个都删除了呢

X_b[random_index:random_index+1]应该就是等价于X_b[random_index]的吧？