老师，我安装pyinstaller时出现了解码错误，这是什么原因，该怎样解决

def func(x,y):
    print(x+y+10)

print(func(1,2))
func(1,2)


def fun(x,y):
    return(x+y+10)

print(fun(1,2))
fun(1,2)

运行结果：

老师，我想请问一下，print和return在定义函数时有什么区别呀？

#时间模块
import time 
#sys系统模块
import sys

time.clock()
list1 = [x for x in range(2,10001,2)]

costTime = time.clock()
print('创建列表耗时:%g'%costTime)

老师，您好。我的代码是在按照视频上敲的，但有个问题，如下图，可怎么解决呀？

老师，这里的输入流和服务器不要关闭吗，怎么只把输出流和客户端关闭了

"""测试一个经典的GUI程序的写法，使用面向对象的方式"""

from tkinter import *
from tkinter import messagebox


class Application(Frame):
    """一个经典的GUI程序的类的写法"""

    def __init__(self, master=None):
        super().__init__(master)  # super()代表的父类的定义而不是父类对象
        self.master = master
        self.pack()

        self.createWidget()

    def createWidget(self):
        """创建组件"""
        self.btn01 = Button(self)
        self.btn01['text'] = '点击送花'
        self.btn01.pack()
        self.btn01['command'] = self.songhua

        # 创建一个退出按钮
        self.btnQuit = Button(self, text='退出', command=root.destroy)
        self.btnQuit.pack()

    def songhua(self):
        messagebox.showinfo('送花', '送你99朵花')


if __name__ == '__main__':
    root = Tk()
    root.geometry('400x100+200+300')
    root.title('一个经典的GUI程序类的测试')
    app = Application(master=root)

老师，请问运行之后没有窗口弹出来，程序没有报错，是什么原因呢，谢谢。

老师请问，带BLOB和不带有什么本质区别？

快捷键里构造器这几个线程有什么区别?

这个super(name)怎么理解?

问题：老师我用c3p0数据库连接池用配置文件实现连接时报错了，你看是我这个xml文件建的有问题吗，还是c3p0-0.9.1.2.jar这个版本还需要依赖别的jar包，下面是报的错，最下面是配置文件图片

六月 19, 2020 10:37:26 上午 com.mchange.v2.log.MLog <clinit>

信息: MLog clients using java 1.4+ standard logging.

六月 19, 2020 10:37:27 上午 com.mchange.v2.c3p0.C3P0Registry banner

信息: Initializing c3p0-0.9.1.2 [built 21-May-2007 15:04:56; debug? true; trace: 10]

六月 19, 2020 10:37:27 上午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager

信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 5, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> hellc3p0, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 1hge9eiaa1k63i3np8f2kz|e73f9ac, idleConnectionTestPeriod -> 0, initialPoolSize -> 10, jdbcUrl -> jdbc.mysql://localhost:3306/test, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 100, maxStatements -> 0, maxStatementsPerConnection -> 2, minPoolSize -> 10, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]

六月 19, 2020 10:37:47 上午 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run

警告: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@1f407bb -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!

六月 19, 2020 10:37:47 上午 com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run

警告: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@1f407bb -- APPARENT DEADLOCK!!! Complete Status: 

Managed Threads: 3

Active Threads: 3

Active Tasks: 

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4e0ee3ce (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@6fe6fc6b (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7f0acc23 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)

Pending Tasks: 

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@17088d3d

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2e211c81

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@767ca88a

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@5fbe09b2

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@c0c061d

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@2a6fc609

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@39440336

Pool thread stack traces:

Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,5,main]

java.lang.Thread.sleep(Native Method)

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1805)

com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,5,main]

java.lang.Thread.sleep(Native Method)

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1805)

com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,5,main]

java.lang.Thread.sleep(Native Method)

com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1805)

com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

六月 19, 2020 10:37:56 上午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run

警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4e0ee3ce -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 

java.sql.SQLException: No suitable driver

at java.sql.DriverManager.getDriver(DriverManager.java:315)

at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:223)

at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)

at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)

at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)

at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)

at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

六月 19, 2020 10:37:56 上午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run

警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@7f0acc23 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 

java.sql.SQLException: No suitable driver

at java.sql.DriverManager.getDriver(DriverManager.java:315)

at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:223)

at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)

at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)

at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)

at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)

at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

六月 19, 2020 10:37:56 上午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run

警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@6fe6fc6b -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 

java.sql.SQLException: No suitable driver

at java.sql.DriverManager.getDriver(DriverManager.java:315)

at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:223)

at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)

at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)

at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)

at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)

at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

java.sql.SQLException: Connections could not be acquired from the underlying database!

at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)

at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)

at com.bjsxt7.connection.C3P0Test.testGetConnection1(C3P0Test.java:31)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

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

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

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

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

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

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)

at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)

at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)

at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.

at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319)

at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)

at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)

... 24 more

Process finished with exit code -1

<ul class="first">

      <li>item 1</li>

      <li>

        <ul class="second">

          <li>child item1</li>

          <li>child item2</li>

        </ul>

      </li>

      <li>item 3</li>

      <span>Hello</span>

    </ul>

$(".first").find()

寻找后代元素一定要加参数嘛 不加参数没有找到，打印的length为0  这是为什么呢 麻烦老师讲解一下

tkinter *
tkinter messagebox

Application(Frame):

     (master=):
        ().(master)  .master = master
        .pack()
        .createwidget()


     ():
         self.label01 =Label(self=)  self.label01.pack()                v1 = stringvar()
     self.entry01 =Entry(self= v1)
     self.entry01.pack()
     v1.set()

__name__==:
    root = Tk()
    root.geometry()
    app = Application(=root)
    root.mainloop()  
    
    老师上面注释就是我的问题，你看一下吧

老师这课程没更新全吧?????   12小节网易云音乐完了之后应该还有呢吧??

老师  这个聚合数据限次数 我用自己的key也不行 要怎么搞 直接请求他那个网址 吗

<template>
  <div class="hello">
   {{ msg }}
    <p v-html="room"></p>
    <a v-bind:href="links.url">{{ links.title }}</a>
    <p>{{1+1}}</p>
    <div>
      <template v-if="flag">
        <p>孙悟空</p>
        <p>唐僧</p>
        <p>猪八戒</p>
        <p>沙和尚</p>
      </template>
      <template v-else>
        <p>六耳猕猴1</p>
        <p>六耳猕猴2</p>
        <p>六耳猕猴3</p>
        <p>六耳猕猴4</p>
      </template>
    </div>
    <p v-show="flag">我是show</p>
    <p v-for="(item,index) in names" v-bind:key="index">{{ item }}</p>
    <p v-for="(item,name,index) in obj" v-bind:key="index">{{name}}:{{item}}: {{index}}</p>
    <p>{{count}}</p>
    <button v-on:mouseover="addCountHandler(10,$event)">按钮</button>
  </div>

</template>

<script>
export default {
  name: 'HelloWorld',
  data () {
    return {
      msg: 'HelloWorld',
      flag:true,
      count:0,
      room:"<h2>只是一个h2标签</h2>",
      names:["zhou","jia","quan"],
      obj:{name:"邹雅婷",age:20,sex:"女"},
      id:1002,
      links:{
        title:"周家泉的小屋",
        url:"http://www.baidu.com",
      }
    }
  },
  methods:{
    addCountHandler(data,event){
      console.log(event)
      this.count += data
    }
  }
}
</script>

这个event事件一直报错

npx babel es6.js

internal/modules/cjs/loader.js:969

  throw err;

  ^

Error: Cannot find module 'D:\xampp\htdocs\lmp\node_modules\_@babel_cli@7.10.5@@babel\cli\bin\babel.js'

    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:966:15)

    at Function.Module._load (internal/modules/cjs/loader.js:842:27)

    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)

    at internal/main/run_main_module.js:17:47 {

  code: 'MODULE_NOT_FOUND',

  requireStack: []

}

执行 npx babel es6.js 时报错了  老师看看

自定义验证器里为什么定义完直接就生效？field指向的是哪个字段呢