有效沟通问答-【官方】百战程序员_IT在线教育培训机构

socket *
threading Thread


():    :
        recv_data = s.recvfrom()  recv_content = recv_data[].decode()
        (recv_contentrecv_data[])
        recv_content == :
            ()
            ():    addr = (, )  :
        data = ()
        s.sendto(data.encode(), addr)  data == :
            ()
            __name__ == :  s = socket(AF_INET, SOCK_DGRAM)  addr = (, )  t1 = Thread(=recv_data)
    t2 = Thread(=send_data)
    t1.start()
    t2.start()
    t1.join()
    t2.join()

客户端：

socket *
threading Thread
():    :
        recv_data = s.recvfrom()  recv_content = recv_data[].decode()
        (recv_contentrecv_data[])
        recv_content == :
            ()
            ():    addr = (, )  :
        data = ()
        s.sendto(data.encode(), addr)  data == :
            ()
            __name__ == :  s = socket(AF_INET, SOCK_DGRAM)  addr = (, )  t1 = Thread(=recv_data)
    t2 = Thread(=send_data)
    t1.start()
    t2.start()
    t1.join()
    t2.join()

报错：

请输入：Exception in thread Thread-1 (recv_data):

Traceback (most recent call last):

File "D:\Program Files\Python\Lib\threading.py", line 1038, in _bootstrap_inner

self.run()

File "D:\Program Files\Python\Lib\threading.py", line 975, in run

self._target(*self._args, **self._kwargs)

File "C:\Users\Beson\PycharmProjects\py1\python网络与并发编程\网络编程\UDP多线程实现客户端.py", line 6, in recv_data

recv_data = s.recvfrom(1024) # 接收数据，1024表示接收的最大字节数

^^^^^^^^^^^^^^^^

OSError: [WinError 10022] 提供了一个无效的参数。

请求老师帮助解答

Python 全系列/第三阶段：Python 网络与并发编程/网络通信 2028楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <p>弹性盒子模型</p>
    <div>
        <p class="lk">父辈</p>
        <div>
            <p class="mn">子级1</p>
        </div>
        <div>
            <p class="m">子级2</p>
        </div>
        <div>
            <p class="n">子级3</p>
        </div>
    </div>
   <br>
   <p>盒子模型，只涉及：margin,padding,width,height差不多的这几个属性</p>
</body>
<style>
    p{
        font-weight: 500px;     /*对大字进行加粗*/
    }
    .lk{
        width:800px;
        height:800px;
        font-size: 90px;
        display:flex;
        background-color: aquamarine;
        flex-direction: column;
        align-items: center;
        justify-content: center;


    }
   /* 
   div>div{
        width: 200px;
        height: 200px;
        font-size: 20px;
        background-color: blueviolet;

    }
    */
    .mn{
        color: aquamarine;
        width: 200px;
        height: 200px;
        font-size: 20px;
        background-color: blueviolet;
    }
    .m{
        color: aquamarine;
        width: 200px;
        height: 200px;
        font-size: 20px;
        background-color: blueviolet;
    
    }
    .n{
        color: blueviolet;
        width: 200px;
        height: 200px;
        font-size: 20px;
        background-color: blueviolet;
    }
</style>
</html>

老师，下面三个为什么不在上面那个大盒子里面呢？

Python 全系列/第七阶段：网页编程基础/CSS3 2029楼

既然你都拷贝了，那为什么浅浅拷贝还会影响原来的值

Python 全系列/第一阶段：Python入门/函数和内存分析 2030楼

老师为什么当include_lowest为True和False时的效果是一样的呢？

Python 全系列/第十九阶段：数据分析-数据管理/Pandas基本使用 2031楼

没懂为什么var就是等于10，覆盖的话不是9吗

Python 全系列/第九阶段：前端进阶-高效开发Vue框架/ES6新特性 2032楼

报错了应该是在StudentMapper.xml里面的错误

"C:\Program Files\Java\jdk-21\bin\java.exe" -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\IDEA 2023.3.4\lib\idea_rt.jar=53785:D:\IDEA 2023.3.4\bin" -Dfile.encoding=GBK -Dsun.stdout.encoding=GBK -Dsun.stderr.encoding=GBK -classpath "D:\IDEA 2023.3.4\lib\idea_rt.jar;D:\IDEA 2023.3.4\plugins\junit\lib\junit5-rt.jar;D:\IDEA 2023.3.4\plugins\junit\lib\junit-rt.jar;C:\Users\ALIENWARE\Desktop\shixun\mybatisDemo2\target\test-classes;C:\Users\ALIENWARE\Desktop\shixun\mybatisDemo2\target\classes;D:\a\maven\apache-maven-3.8.6\mvn_res\org\mybatis\mybatis\3.5.9\mybatis-3.5.9.jar;D:\a\maven\apache-maven-3.8.6\mvn_res\com\mysql\mysql-connector-j\8.0.32\mysql-connector-j-8.0.32.jar;D:\a\maven\apache-maven-3.8.6\mvn_res\com\google\protobuf\protobuf-java\3.21.9\protobuf-java-3.21.9.jar;D:\a\maven\apache-maven-3.8.6\mvn_res\junit\junit\4.13.2\junit-4.13.2.jar;D:\a\maven\apache-maven-3.8.6\mvn_res\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;D:\a\maven\apache-maven-3.8.6\mvn_res\log4j\log4j\1.2.12\log4j-1.2.12.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 TestManyTableQuery,testFindAllStudent

[03/21 17:37:36] 0 [ main] DEBUG ache.ibatis.logging.LogFactory - Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.[03/21 17:37:36] 11 [ main] DEBUG source.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections.[03/21 17:37:36] 12 [ main] DEBUG source.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections.[03/21 17:37:36] 12 [ main] DEBUG source.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections.[03/21 17:37:36] 12 [ main] DEBUG source.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections.[03/21 17:37:36] 65 [ main] DEBUG ansaction.jdbc.JdbcTransaction - Opening JDBC Connection[03/21 17:37:37] 381 [ main] DEBUG source.pooled.PooledDataSource - Created connection 1524305331.[03/21 17:37:37] 382 [ main] DEBUG ansaction.jdbc.JdbcTransaction - Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@5adb0db3][03/21 17:37:37] 388 [ main] DEBUG g.mapper.StudentMapper.findAll - ==> Preparing: select * from student;[03/21 17:37:37] 413 [ main] DEBUG g.mapper.StudentMapper.findAll - ==> Parameters: [03/21 17:37:37] 446 [ main] DEBUG ansaction.jdbc.JdbcTransaction - Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@5adb0db3][03/21 17:37:37] 447 [ main] DEBUG ansaction.jdbc.JdbcTransaction - Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@5adb0db3][03/21 17:37:37] 447 [ main] DEBUG source.pooled.PooledDataSource - Returned connection 1524305331 to pool.

org.apache.ibatis.exceptions.PersistenceException:

### Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class org.pojo.Classes with invalid types (int,String,List) or values (1,张三,10). Cause: java.lang.IllegalArgumentException: argument type mismatch

### The error may exist in mapper/StudentMapper.xml

### The error may involve org.mapper.StudentMapper.findAll

### The error occurred while handling results

### SQL: select * from student;

### Cause: org.apache.ibatis.reflection.ReflectionException: Error instantiating class org.pojo.Classes with invalid types (int,String,List) or values (1,张三,10). Cause: java.lang.IllegalArgumentException: argument type mismatch

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:153)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:145)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)

at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)

at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)

at org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:145)

at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:86)

at jdk.proxy2/jdk.proxy2.$Proxy11.findAll(Unknown Source)

at TestManyTableQuery.testFindAllStudent(TestManyTableQuery.java:35)

at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)

at java.base/java.lang.reflect.Method.invoke(Method.java:580)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)

at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)

at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)

at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)

at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)

at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)

at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)

at org.junit.runners.ParentRunner.run(ParentRunner.java:413)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)

at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)

at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)

at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)

at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)

at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)

Caused by: org.apache.ibatis.reflection.ReflectionException: Error instantiating class org.pojo.Classes with invalid types (int,String,List) or values (1,张三,10). Cause: java.lang.IllegalArgumentException: argument type mismatch

at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:88)

at org.apache.ibatis.reflection.factory.DefaultObjectFactory.create(DefaultObjectFactory.java:53)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createUsingConstructor(DefaultResultSetHandler.java:716)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createByConstructorSignature(DefaultResultSetHandler.java:694)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:658)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:631)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:426)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyNestedResultMappings(DefaultResultSetHandler.java:953)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:435)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForNestedResultMap(DefaultResultSetHandler.java:910)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:327)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:302)

at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:195)

at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:65)

at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)

at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)

at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325)

at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:151)

... 35 more

Caused by: java.lang.IllegalArgumentException: argument type mismatch

at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:65)

at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)

at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)

at org.apache.ibatis.reflection.factory.DefaultObjectFactory.instantiateClass(DefaultObjectFactory.java:74)

... 55 more

Caused by: java.lang.ClassCastException: Cannot cast java.lang.Integer to java.util.List

at java.base/java.lang.Class.cast(Class.java:4067)

at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)

... 58 more

进程已结束，退出代码为 -1

JAVA 全系列/第六阶段：项目管理与SSM框架/Mybatis 2033楼

老师这里匹配不用该是从第二个到第八个吗？也就是输出a2b3c4d5e

Python 全系列/第四阶段：函数式编程和核心特性/正则表达式 2034楼

好像都没有编写admin/login接口，那他是怎么登上去的啊

JAVA 全系列/第十八阶段：亿级高并发电商项目/亿级高并发电商项目(旧) 2035楼

问下，a=3 a是不是标识符啊他也是变量？

Python 全系列/第一阶段：Python入门/编程基本概念 2036楼

python

a()掉了是什么意思呢

Python 全系列/第二阶段：Python 深入与提高/异常机制 2037楼

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>渐变动画</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            display: flex;
            justify-content: left;
            align-items: center;
            width: 100%;
            height: 100vh;
            background-image: linear-gradient(135deg, #99ccff, #9999ff, #cc66ff);
            position: relative;   /*子元素都将相对于body定位*/
        }

        .box {
            width: 50px;
            height: 300px;
            background-image: linear-gradient(135deg, #66ffff, #66ccff, #6699ff);
            border-radius: 0 30px 30px 0;
            opacity: 0.4;
            transition: all 0.6s ease; /*侧边栏由透明变成有色并且伸展的效果动画时间*/
            position: absolute; 
            left: 200px   /*侧边栏将相对于body进行一个相对定位，据左边200px*/
        }

        ul {
            display: flex;
            height: 300px; /*给ul设定一个高度与容器高度一样，才可设置上下居中*/
            flex-direction: column;
            align-items: left;
            justify-content: center;
            padding-left: 25px;
            list-style: none;
            position: absolute; /*子元素都将相对于body定位*/
            left:200px ;  /*无序列表ul每个元素都将相对于body进行一个相对定位，据左边200px*/
            opacity: 0;
            transition: all 0.6s ease 0.6s;
        }

        ul li {
            margin: 12px 1px;
            
            /* display: none; */
            
        }

        ul li a{
            text-decoration: none ;
            color: white;
            text-shadow: -5px 5px 15px #bd4be3;
            font-size: 20px;
            font-weight: 700;
            
        }

        .t-box{
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background-image: linear-gradient(135deg, #66ffff, #66ccff, #6699ff);
            margin-top: 20px;
            position: absolute;
            top: 160px;
            left: 200px;
        }

        .t-box:hover+.box{
            opacity: 1;
            width: 100px;
            height: 300px;
        }

        /* 在鼠标接触到的时候t-box的时候使其相邻兄弟元素box拉伸 */

       .t-box:hover~ul{
            
            opacity: 1;
       }

       
        
    </style>
</head>

<body>
    <div class="t-box"></div>
    <div class="box"></div>
    <ul>
        <li><a href="#">Play</a></li>
        <li><a href="#">Store</a></li>
        <li><a href="#">Map</a></li>
        <li><a href="#">Chart</a></li>
        <li><a href="#">Art</a></li>

    </ul>

   
</body>

</html>

如上做了一个丝滑的伸缩侧边栏，字体动画在栏伸展开之后才显示。问题是放开鼠标之后栏缩回去的时候，字体没有立刻消失，而是过了一会儿才消失。怎样设置才能让字体消失的时候也和菜单栏一起同一时间小时呢？

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS3新特性 2038楼

那pwd有没有被存储，被存储到哪里去了

Python 全系列/第十阶段：Flask百战电商后台项目/Flask百战电商后台项目 2039楼

老师不是说键两个相同单位只会显示前面出现的嘛，我这怎么两个年龄都显示出来了

Python 全系列/第一阶段：Python入门/序列 2040楼

同学您好