这个跟课件一样的，为啥报错呀?

老师，我安装python，出现这个界面，是什么原因呀，我的电脑是win7系统32位的。

from multiprocessing import Process
from time import sleep

class Myprocess(Process):
    def __init__(self,name):#这个name就是类里面的参数
        Process.__init__(self)
        self.name=name
    def run(self):#这个self就不需要再写个namae了 因为上面有了
        print(f"Process:{self.name}start")
        
p1=Myprocess('pcl')

p1.start()

    老师 请问报错里 为什么会出现几百行的错误 我的代码都没有那么多行

C:\Users\pcl\venv\Scripts\python.exe "C:/Users/pcl/.1aPython all exercise/线程与进程/进程实现/进程类包装.py"

Traceback (most recent call last):

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

  File "C:\Users\pcl\lib\multiprocessing\spawn.py", line 116, in spawn_main

    exitcode = _main(fd, parent_sentinel)

  File "C:\Users\pcl\lib\multiprocessing\spawn.py", line 125, in _main

    prepare(preparation_data)

  File "C:\Users\pcl\lib\multiprocessing\spawn.py", line 236, in prepare

    _fixup_main_from_path(data['init_main_from_path'])

  File "C:\Users\pcl\lib\multiprocessing\spawn.py", line 287, in _fixup_main_from_path

    main_content = runpy.run_path(main_path,

  File "C:\Users\pcl\lib\runpy.py", line 268, in run_path

    return _run_module_code(code, init_globals, run_name,

  File "C:\Users\pcl\lib\runpy.py", line 97, in _run_module_code

    _run_code(code, mod_globals, init_globals,

  File "C:\Users\pcl\lib\runpy.py", line 87, in _run_code

    exec(code, run_globals)

  File "C:\Users\pcl\.1aPython all exercise\线程与进程\进程实现\进程类包装.py", line 13, in <module>

    p1.start()

  File "C:\Users\pcl\lib\multiprocessing\process.py", line 121, in start

    self._popen = self._Popen(self)

  File "C:\Users\pcl\lib\multiprocessing\context.py", line 224, in _Popen

    return _default_context.get_context().Process._Popen(process_obj)

  File "C:\Users\pcl\lib\multiprocessing\context.py", line 327, in _Popen

    return Popen(process_obj)

  File "C:\Users\pcl\lib\multiprocessing\popen_spawn_win32.py", line 45, in __init__

    prep_data = spawn.get_preparation_data(process_obj._name)

  File "C:\Users\pcl\lib\multiprocessing\spawn.py", line 154, in get_preparation_data

    _check_not_importing_main()

  File "C:\Users\pcl\lib\multiprocessing\spawn.py", line 134, in _check_not_importing_main

    raise RuntimeError('''

RuntimeError: 

        An attempt has been made to start a new process before the

        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your

        child processes and you have forgotten to use the proper idiom

        in the main module:

            if __name__ == '__main__':

                freeze_support()

                ...

        The "freeze_support()" line can be omitted if the program

        is not going to be frozen to produce an executable.

Process finished with exit code 0

老师，为什么我的idea中的maven每次都需要我手动重新配置，我配置过两次啦

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd ">

    <!--配置解析properties工具类-->
    <context:property-placeholder location="db.properties"/>

    <!--配置数据源-->
    <bean id="dataSource1" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--配置SqlSessionFactoryBean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource1"/>
        <!--配置别名-->
       <property name="transactionFactory" value="com.cxx.pojo"/>
        <!--引入mapper的配置文件-->
        <property name="mapperLocations" value="com/cxx/mapper/*.xml"/>
    </bean>

    <!--SqlSessionTemplate-->
    <bean id="sqlSessionTemplate1" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg name="sqlSessionFactory" ref="sqlSessionFactoryBean"/>
    </bean>
    <!--配置持久层Bean对象-->
    <bean id="userDao1" class="com.cxx.dao.impl.UsersDaoImpl">
        <property name="sqlSessionTemplate" ref="sqlSessionTemplate1"/>
    </bean>
    <!--配置业务层bean对象-->
    <bean id="usersService" class="com.cxx.service.impl.UsersServiceImpl">
        <property name="usersDao" ref="userDao1"/>
    </bean>
</beans>

持久层如下:

package com.cxx.dao;

import com.cxx.pojo.Users;

public interface UsersDao {
    //添加用户的持久层接口方法
    void addUsers(Users users);
}

持久层实现类

package com.cxx.dao.impl;

import com.cxx.dao.UsersDao;
import com.cxx.mapper.UsersMapper;
import com.cxx.pojo.Users;
import org.mybatis.spring.SqlSessionTemplate;

public class UsersDaoImpl implements UsersDao {
    private SqlSessionTemplate sqlSessionTemplate;

    public SqlSessionTemplate getSqlSessionTemplate() {
        return sqlSessionTemplate;
    }

    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
        this.sqlSessionTemplate = sqlSessionTemplate;
    }

    //添加用户的持久层接口实现类的方法
    @Override
    public void addUsers(Users users) {
        UsersMapper mapper = this.sqlSessionTemplate.getMapper(UsersMapper.class);
        mapper.insertSelective(users);
    }
}

业务层接口

package com.cxx.service;

import com.cxx.pojo.Users;

public interface UsersService {
    void  insertUsers(Users users);
}

业务层接口实现类

package com.cxx.service.impl;

import com.cxx.dao.UsersDao;
import com.cxx.pojo.Users;
import com.cxx.service.UsersService;


public class UsersServiceImpl implements UsersService {
    private UsersDao usersDao;

    public UsersDao getUsersDao() {
        return usersDao;
    }

    public void setUsersDao(UsersDao usersDao) {
        this.usersDao = usersDao;
    }

    @Override
    public void insertUsers(Users users) {
        this.usersDao.addUsers(users);
    }
}

测试类

package com.cxx.test;

import com.cxx.pojo.Users;
import com.cxx.service.UsersService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class AddUsersTest {
    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        UsersService usersService = (UsersService) applicationContext.getBean("usersService");
        Users users = new Users();
        users.setUsername("老吴");
        users.setUsersex("男");
        usersService.insertUsers(users);
    }
}

这里跟视频做的不一样,持久层和业务层分离做的,,,但是运行报错:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactoryBean' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'org.apache.ibatis.transaction.TransactionFactory' for property 'transactionFactory'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.apache.ibatis.transaction.TransactionFactory' for property 'transactionFactory': no matching editors or conversion strategy found
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:610)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:925)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
	at com.cxx.test.AddUsersTest.main(AddUsersTest.java:10)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'org.apache.ibatis.transaction.TransactionFactory' for property 'transactionFactory'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.apache.ibatis.transaction.TransactionFactory' for property 'transactionFactory': no matching editors or conversion strategy found
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:595)
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:609)
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:219)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1738)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1694)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1434)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601)
	... 11 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'org.apache.ibatis.transaction.TransactionFactory' for property 'transactionFactory': no matching editors or conversion strategy found
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:262)
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:590)
	... 17 more

Process finished with exit code 1

分析了半小时左右,去掉了spring配置文件中的配置别名 运行成功,为什么这里别名会引起报错??

<!--配置SqlSessionFactoryBean-->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource1"/>
    <!--配置别名-->
   <!--<property name="transactionFactory" value="com.cxx.pojo"/>-->
    <!--引入mapper的配置文件-->
    <property name="mapperLocations" value="com/cxx/mapper/*.xml"/>
</bean>

去掉反而正常了呢?

字符串连接符其中一个操作数是字符串另一个操作数可以是浮点数吗？可以是布尔型吗？eg:"hello"+1.2或者"hello"+true

老师，我更改了名字，还是不行，报错了~请问这个怎样导入包，试了好多次，还是不行，下面是Sarly的文件内容

老师：我也出现了同样的问题，这是什么原因啊？

扫码付钱后，整个idea没有任何反应。。。如果代码没出错的话，是因为我用的是natapp免费版的问题吗？

 为啥下拉列表展示不出来

<div class="navbar navbar-default">

        <div class="container">

            <div class="navbar-header">

                <a class="navbar-brand" href="#">lianxishen</a>

            </div>

            <div class="collapse navbar-collapse">

                <ul class="nav navbar-nav">

                    <li class="active"><a href="#">首页</a></li>

                    <li><a href="#">新闻</a></li>

                    <li><a href="#">娱乐</a></li>

                    <li><a href="#">体育</a></li>

                    <li class="dropdown">

                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">

                            军事<span class="caret"></span>

                        </a>

                        <ul class="dropdown-menu">

                            <li><a href="#">空军</a></li>

                            <li><a href="#">陆军</a></li>

                            <li><a href="#">海军</a></li>

                        </ul>

                    </li>

                </ul>

            </div>

        </div>

    </div>

老师测试清理缓存时报错，

试着添加配置然后在编译时报错，这该咋解决呢

启动服务器报了这个错误，老师你能看看这个错误吗

import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;


/*  元素自身实现比较规则  */
public class TestTreeMap {

    public static void main(String[] args) {
        //实例化TreeMap
        Map<Users,String> map = new TreeMap<>();
        Users u1 = new Users("oldlu",18);
        Users u2 = new Users("admin",22);
        Users u3 = new Users("sxt",22);

        // 添加
        map.put(u1,"oldlu");
        map.put(u2,"admin");
        map.put(u3,"sxt");
        System.out.println(map.get(u3));

        // 遍历
        Set<Users> set = map.keySet();
        for(Users users:set){
            Users key = users;
            String val = map.get(key);
            System.out.println(key+" --- "+val);
        }

    }

}

class Users implements Comparable<Users>{
    private String usersName;
    private int usersAge;

    public Users() {
    }

    public Users(String usersName, int usersAge) {
        this.usersName = usersName;
        this.usersAge = usersAge;
    }

    public String getUsersName() {
        return usersName;
    }

    public void setUsersName(String usersName) {
        this.usersName = usersName;
    }

    public int getUsersAge() {
        return usersAge;
    }

    public void setUsersAge(int usersAge) {
        this.usersAge = usersAge;
    }

    @Override
    public String toString() {
        return "姓名：" + usersName + "    年龄：" + usersAge;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Users users = (Users) o;
        return usersAge == users.usersAge &&
                Objects.equals(usersName, users.usersName);
    }

    @Override
    public int hashCode() {
        return Objects.hash(usersName, usersAge);
    }

    @Override
    public int compareTo(Users o) {
        // 比较年龄 由小到大
        if(this.usersAge < o.getUsersAge()){
            return 1;
        }
        // 如果年龄相等 按名字排序
        if(this.usersAge == o.getUsersAge()){
            this.usersName.compareTo(o.getUsersName());
        }
        return -1;
    }
}

value值为什么是null？

import re

import requests

from fake_useragent import  UserAgent

url = 'https://www.qidian.com/rank/yuepiao/'

headers = {'User-Agent':UserAgent().chrome}

res = requests.get(url,headers = headers)

res.encoding = 'utf-8'

with open('tmp.html','w',encoding='utf-8') as f:

     f.write(res.text)

rs =re.findall('<div class="book-mid-info"> <h2><a href=".+?>(.+)</a>',res.text)

print(rs)

爬的起点网，为什么会爬出来想要的东西后面的那些什么标签什么的呀

ruoyi项目在那个章节里面讲的啊，我跳的看的。方便给我说下吗