options这个参数是啥意思，怎么用法呢。。。。

老师，我想匹配以@qq.com为结尾的字符串，这段代码哪里有问题，应该怎么修改呀？

import re
s = '123456@qq.com'
pattern1 = '*@qq.com$'
v1=re.match(pattern1,s);print(v1)

老师，尝试登录的时候提供的手机号和密码都是正确存在的，总是提示下面的错误。非说是用户名或密码不正确。然后跟着后面一大串的exception.我实在是找不到原因了，项目都重新写了一遍了。救救我吧。。。

Creating a new SqlSession

SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@5e1f02bc] was not registered for synchronization because synchronization is not active

JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@3d8d450] will not be managed by Spring

==>  Preparing: SELECT user_id,dept_id,user_name,user_type,sex,age,picture,background,phone,email,strong,honor,introduction,user_rank,`password`,last_login_time,last_login_ip,`status`,union_id,open_id,create_time,update_time,create_by,update_by,salt,del_flag,scheduling_flag FROM sys_user WHERE (phone = ?) 

==> Parameters: 13888001004(String)

<==    Columns: user_id, dept_id, user_name, user_type, sex, age, picture, background, phone, email, strong, honor, introduction, user_rank, password, last_login_time, last_login_ip, status, union_id, open_id, create_time, update_time, create_by, update_by, salt, del_flag, scheduling_flag

<==        Row: 5, 104, 华佗, 1, 1, 22, , 4, 13888001004, his4@163.com, 全科, 神医, <<BLOB>>, 1, 520a5b05dbec9f937f70092e088058e8, 2018-03-16 11:33:00, 127.0.0.1, 0, null, null, 2018-03-16 11:33:00, 2020-04-30 00:49:52, admin, 超级管理员, 91D53B3C4B8E40C7BA3613E41546AAE1, 0, 0

<==      Total: 1

Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@5e1f02bc]

2020-08-30 04:10:56.275 ERROR 34210 --- [nio-8080-exec-1] c.b.controller.system.LoginController    : 用户名或密码不正确

redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool

at redis.clients.jedis.util.Pool.getResource(Pool.java:59) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.JedisPool.getResource(JedisPool.java:234) ~[jedis-3.1.0.jar:na]

at org.crazycake.shiro.RedisManager.getJedis(RedisManager.java:35) ~[shiro-redis-3.2.3.jar:na]

at org.crazycake.shiro.WorkAloneRedisManager.set(WorkAloneRedisManager.java:71) ~[shiro-redis-3.2.3.jar:na]

at org.crazycake.shiro.RedisSessionDAO.saveSession(RedisSessionDAO.java:90) ~[shiro-redis-3.2.3.jar:na]

at org.crazycake.shiro.RedisSessionDAO.doCreate(RedisSessionDAO.java:131) ~[shiro-redis-3.2.3.jar:na]

at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.create(AbstractSessionDAO.java:116) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.session.mgt.DefaultSessionManager.create(DefaultSessionManager.java:177) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.session.mgt.DefaultSessionManager.doCreateSession(DefaultSessionManager.java:158) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.createSession(AbstractValidatingSessionManager.java:136) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.session.mgt.AbstractNativeSessionManager.start(AbstractNativeSessionManager.java:99) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.SessionsSecurityManager.start(SessionsSecurityManager.java:152) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:336) [shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:312) [shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSubjectDAO.mergePrincipals(DefaultSubjectDAO.java:204) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSubjectDAO.saveToSession(DefaultSubjectDAO.java:166) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSubjectDAO.save(DefaultSubjectDAO.java:147) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSecurityManager.save(DefaultSecurityManager.java:383) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:350) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:183) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.mgt.DefaultSecurityManager.login(DefaultSecurityManager.java:283) ~[shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.subject.support.DelegatingSubject.login(DelegatingSubject.java:256) [shiro-core-1.3.2.jar:1.3.2]

at com.bjsxt.controller.system.LoginController.login(LoginController.java:65) ~[classes/:na]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_211]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_211]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_211]

at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_211]

at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:112) [shiro-web-1.5.3.jar:1.5.3]

at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90) [shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83) [shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383) [shiro-core-1.3.2.jar:1.3.2]

at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) [shiro-web-1.5.3.jar:1.5.3]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_211]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_211]

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]

at java.lang.Thread.run(Thread.java:748) [na:1.8.0_211]

Caused by: redis.clients.jedis.exceptions.JedisDataException: WRONGPASS invalid username-password pair

at redis.clients.jedis.Protocol.processError(Protocol.java:132) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.Protocol.process(Protocol.java:166) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.Protocol.read(Protocol.java:220) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:318) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.Connection.getStatusCodeReply(Connection.java:236) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.BinaryJedis.auth(BinaryJedis.java:2229) ~[jedis-3.1.0.jar:na]

at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:119) ~[jedis-3.1.0.jar:na]

at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:889) ~[commons-pool2-2.7.0.jar:2.7.0]

at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:424) ~[commons-pool2-2.7.0.jar:2.7.0]

at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:349) ~[commons-pool2-2.7.0.jar:2.7.0]

at redis.clients.jedis.util.Pool.getResource(Pool.java:50) ~[jedis-3.1.0.jar:na]

... 91 common frames omitted

老师，为什么这里用的是this，不能用父类的名字来调用呢？是不是不同包中，只能通过this和super来调用父类自己被protected修饰的属性和方法？

老师，你的那些资料去哪里能获取呀，程序的安装包，还有ppt那些

老师，这个插入的结果是失败，不成功，已经尝试过很多次，不知道哪里出问题了

老师，请问，我们之前学的位置参数和命名参数，x,y传给m,n按照位置，这里的t为什么刚好是传入的task呢

老师，您好，请问在创建P1变量的时候，为甚么说P1是占4个字节？

# coding=utf-8
"""
新增功能：
    1.
"""
# 导入pygame模块

import pygame, time, random
from pygame.sprite import Sprite

SCREEN_WIDTH = 1000
SCREEN_HEIGHT = 600
BG_COLOR = pygame.Color(0, 0, 0)
TEXT_COLOR = pygame.Color(255, 0, 0)


class BaseItem(Sprite):
    def __init__(self, color, width, height):
        pygame.sprite.Sprite.__init__(self)


class MainGame:
    window = None
    my_tank = None
    # 存储敌方坦克的列表
    enemyTankList = []
    # 定义敌方坦克的数量
    enemyTanKCount = 5
    # 存储我方坦克子弹的列表
    myBulletList = []
    # 存储敌方子弹的列表
    enemyBulletList = []
    # 存储爆炸效果的列表
    explodeList = []

    def __init__(self):
        pass

    # 开始游戏
    def startGame(self):
        # 加载主窗口
        # 初始化主窗口
        pygame.display.init()
        # 设置窗口的大小及显示
        MainGame.window = pygame.display.set_mode([SCREEN_WIDTH, SCREEN_HEIGHT])
        # 初始化我方坦克
        MainGame.my_tank = Tank(350, 250)
        # 初始化敌方坦克,并能将敌方坦克添加到列表中
        self.createEnemyTank()
        # 设置窗口的标题
        pygame.display.set_caption("坦克大战1.1.0")
        while True:
            # 使坦克的移动速度慢一点
            time.sleep(0.02)
            # 给窗口设置填充色
            MainGame.window.fill(BG_COLOR)
            # 获取事件
            self.getEvent()
            # 绘制文字
            MainGame.window.blit(self.getTextSuface("敌方坦克剩余数量%d" % len(MainGame.enemyTankList)), (10, 10))
            # 调用坦克显示 方法
            # 判断我方坦克是否存活
            if MainGame.my_tank and MainGame.my_tank.live:
                MainGame.my_tank.displayTank()
            else:
                # 删除我方坦克
                del MainGame.my_tank
                MainGame.my_tank = None
            # 循环遍历敌方坦克列表，展示敌方坦克
            self.blitEnemyTank()
            # 循环遍历显示我方坦克子弹
            self.blitMyBullet()
            # 循环遍历敌方子弹列表，展示敌方子弹
            self.blitEnemyBullet()
            # 循环遍历爆炸列表，展示爆炸效果
            self.blitExplode()
            # 调用移动方法
            # 如果坦克的开关是开启才能移动
            if MainGame.my_tank and MainGame.my_tank.live:
                if not MainGame.my_tank.stop:
                    MainGame.my_tank.move()
            pygame.display.update()

    # 初始化敌方坦克,并能将敌方坦克添加到列表中
    def createEnemyTank(self):
        top = 100
        # 循环生成敌方坦克
        for i in range(MainGame.enemyTanKCount):
            left = random.randint(0, 600)
            speed = random.randint(4, 10)
            enemy = EnemyTank(left, top, speed)
            MainGame.enemyTankList.append(enemy)

    # 循环展示爆炸效果
    def blitExplode(self):
        for explode in MainGame.explodeList:
            # 判断是否活着
            if explode.live:
                # 展示
                explode.displayExplode()
            else:
                # 在爆炸列表中移除
                MainGame.explodeList.remove(explode)

    # 遍历循环敌方坦克列表，展示敌方坦克
    def blitEnemyTank(self):
        for enemyTank in MainGame.enemyTankList:
            enemyTank.displayTank()
            enemyTank.randMove()
            # 发射子弹
            enemyBullet = enemyTank.shot()
            # 将敌方子弹存储到敌方列表中
            MainGame.enemyBulletList.append(enemyBullet)

    # 循环遍历敌方坦克列表，展示敌方坦克
    def blitEnemyTank(self):
        for enemyTank in MainGame.enemyTankList:
            # 判断当前坦克是否活着
            if enemyTank.live:
                enemyTank.displayTank()
                enemyTank.randMove()
                # 发射子弹
                enemyBullet = enemyTank.shot()
                # 敌方子弹是否None，如果不为None则添加到敌方子弹列表中
                if enemyBullet:
                    # 将敌方子弹存储到敌方子弹列表中
                    MainGame.enemyBulletList.append(enemyBullet)
            else:
                # 不活着 从敌方坦克列表中移除
                MainGame.enemyTankList.remove(enemyTank)

    # 循环遍历我方坦克子弹存储列表
    def blitMyBullet(self):
        for myBullet in MainGame.myBulletList:
            # 判断当前子弹是否活着状态，如果是则进行显示及移动
            if myBullet.live:
                myBullet.displayBullet()
                # 调用子弹的移动方法
                myBullet.move()
                # 调用检测我方子弹是否与敌方坦克发生碰撞
                myBullet.myBullet_hit_enemyTank()
            # 否则在列表中删除
            else:
                MainGame.myBulletList.remove(myBullet)

    # 循环遍历敌方子弹列表，展示敌方子弹
    def blitEnemyBullet(self):
        for enemyBullet in MainGame.enemyBulletList:
            if enemyBullet.live:
                enemyBullet.displayBullet()
                enemyBullet.move()
                # 调用敌方子弹与我方坦克碰撞的方法
                enemyBullet.enemyBullet_hit_myTank()
            else:
                MainGame.enemyBulletList.remove(enemyBullet)

    # 结束游戏·
    def endGame(self):
        print("退出游戏")
        exit()

    # 左上角文字的绘制
    def getTextSuface(self, text):
        # 初始化模块
        pygame.font.init()
        # 查看所有的字体名称
        # print(pygame.font.get_fonts())
        # 获取字体Font对象
        font = pygame.font.SysFont("kaiti", 8)
        # 绘制文字信息
        textSurface = font.render(text, True, TEXT_COLOR)
        return textSurface

    # 获取事件
    def getEvent(self):
        # 获取所有事件
        eventList = pygame.event.get()
        # 遍历事件
        for event in eventList:
            # 判断按下的键关闭还是键盘按下
            # 如果按的是退出，关闭窗口
            if event.type == pygame.QUIT:
                self.endGame()
            # 如果 是键盘的按下
            if event.type == pygame.KEYDOWN:
                if MainGame.my_tank and MainGame.my_tank.live:
                    # 判断按下的是左、右、上、下键
                    if event.key == pygame.K_LEFT:
                        # 切换方向
                        MainGame.my_tank.direction = "L"
                        # 修改坦克的开关状态
                        MainGame.my_tank.stop = False
                        # MainGame.my_tank.move()
                        print("按下左键，坦克向左移动")
                    elif event.key == pygame.K_RIGHT:
                        # 切换方向
                        MainGame.my_tank.direction = "R"
                        # 修改坦克的开关状态
                        MainGame.my_tank.stop = False
                        # MainGame.my_tank.move()
                        print("按下右键，坦克向右移动")
                    elif event.key == pygame.K_UP:
                        # 切换方向
                        MainGame.my_tank.direction = "U"
                        # 修改坦克的开关状态
                        MainGame.my_tank.stop = False
                        # MainGame.my_tank.move()
                        print("按下上键，坦克向上移动")
                    elif event.key == pygame.K_DOWN:
                        # 切换方向
                        MainGame.my_tank.direction = "D"
                        # 修改坦克的开关状态
                        MainGame.my_tank.stop = False
                        # MainGame.my_tank.move()
                        print("按下下键，坦克向下移动")
                    elif event.key == pygame.K_SPACE:
                        print("发射子弹")
                        # 如果当前我方子弹列表的大小， 小于3才能创建
                        if len(MainGame.myBulletList) < 3:
                            # 创建我方坦克发射的子弹
                            myBullet = Bullet(MainGame.my_tank)
                            MainGame.myBulletList.append(myBullet)

            # 松开方向键，坦克停止移动，修改坦克的开关状态
            if event.type == pygame.KEYUP:
                # 判断松开的是上、下、左、右键才停止坦克移动
                if event.key == pygame.K_UP or event.key == pygame.K_DOWN or event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                    if MainGame.my_tank and MainGame.my_tank.live:
                        MainGame.my_tank.stop = True


class Tank(BaseItem):
    # 添加距离左边left，距离上边top
    def __init__(self, left, top):
        # 保存加载的图片
        self.images = {
            "U": pygame.image.load("img/p1tankU.gif"),
            "D": pygame.image.load("img/p1tankD.gif"),
            "L": pygame.image.load("img/p1tankL.gif"),
            "R": pygame.image.load("img/p1tankR.gif")
        }
        # 方向
        self.direction = "U"
        # 根据当前图片的方向获取图片 surface
        self.image = self.images[self.direction]
        # 根据图片湖区区域
        self.rect = self.image.get_rect()
        # 设置区域的left和top
        self.rect.left = left
        self.rect.top = top
        # 速度决定移动的快慢
        self.speed = 5
        # 坦克移动的开关
        self.stop = True
        # 是否活着
        self.live = True

    # 移动
    def move(self):
        # 判断坦克的方向进行移动
        if self.direction == "L":
            if self.rect.left > 0:
                self.rect.left -= self.speed
        if self.direction == "R":
            if self.rect.left + self.rect.height < SCREEN_WIDTH:
                self.rect.left += self.speed
        if self.direction == "U":
            if self.rect.top > 0:
                self.rect.top -= self.speed
        if self.direction == "D":
            if self.rect.top + self.rect.height < SCREEN_HEIGHT:
                self.rect.top += self.speed

    # 射击
    def shot(self):
        return Bullet(self)

    def displayTank(self):
        # 获取展示的对象
        self.image = self.images[self.direction]
        # 获取blit方法展示
        MainGame.window.blit(self.image, self.rect)


# 我方坦克
class MyTank(Tank):
    def __init__(self):
        pass


# 敌方坦克
class EnemyTank(Tank):
    def __init__(self, left, top, speed):
        # 调用父类初始化方法
        super(EnemyTank, self).__init__(left, top)
        # 加载图片集
        self.images = {
            "U": pygame.image.load("img/enemy1U.gif"),
            "D": pygame.image.load("img/enemy1D.gif"),
            "L": pygame.image.load("img/enemy1L.gif"),
            "R": pygame.image.load("img/enemy1R.gif")
        }
        # 方向，随机生成敌方坦克的方向
        self.direction = self.randDirection()
        # 根据方向获取图片
        self.image = self.images[self.direction]
        # 区域
        self.rect = self.image.get_rect()
        # 对left和top赋值
        self.rect.left = left
        self.rect.top = top
        # 速度
        self.speed = speed
        # 移动开关键
        self.flag = True
        # 新增加一个步数变量
        self.step = 20

    # 随机生成敌方坦克的方向
    def randDirection(self):
        num = random.randint(1, 4)
        if num == 1:
            return "U"
        elif num == 2:
            return "D"
        elif num == 3:
            return "L"
        elif num == 4:
            return "R"

    # 敌方坦克随机移动的方法
    def randMove(self):
        if self.step <= 0:
            # 修改方向
            self.direction = self.randDirection()
            # 让步数复位
            self.step = 20
        else:
            self.move()
            # 让步数递减
            self.step -= 1

    # 重写shot（）
    def shot(self):
        # 随机生成100以内的数
        num = random.randint(1, 100)
        if num < 5:
            return Bullet(self)


class Bullet(BaseItem):
    def __init__(self, tank):
        # 加载图片
        self.image = pygame.image.load("img/enemyzidan.gif")
        # 坦克的方向决定子弹方向
        self.direction = tank.direction
        # 获取区域
        self.rect = self.image.get_rect()
        # 子弹的left和top与方向有关
        if self.direction == "U":
            self.rect.left = tank.rect.left + tank.rect.width / 2 - self.rect.width / 2
            self.rect.top = tank.rect.top - self.rect.height
        elif self.direction == "D":
            self.rect.left = tank.rect.left + tank.rect.width / 2 - self.rect.width / 2
            self.rect.top = tank.rect.top + tank.rect.height
        elif self.direction == "L":
            self.rect.left = tank.rect.left - tank.rect.width / 2 - self.rect.width / 2
            self.rect.top = tank.rect.top + tank.rect.height / 2 - self.rect.width / 2
        elif self.direction == "R":
            self.rect.left = tank.rect.left + tank.rect.width
            self.rect.top = tank.rect.top + tank.rect.height / 2 - self.rect.width / 2
        # 子弹的速度
        self.speed = 6
        # 子弹的状态，是否碰到墙壁，如果碰到墙壁，修改此状态
        self.live = True

    # 子弹移动
    def move(self):
        if self.direction == "U":
            if self.rect.top > 0:
                self.rect.top -= self.speed
            else:
                # 修改子弹的状态
                self.live = False
        elif self.direction == "R":
            if self.rect.left + self.rect.width < SCREEN_WIDTH:
                self.rect.left += self.speed
            else:
                # 修改子弹的状态
                self.live = False
        elif self.direction == "D":
            if self.rect.top + self.rect.height < SCREEN_HEIGHT:
                self.rect.top += self.speed
            else:
                # 修改子弹的状态
                self.live = False
        elif self.direction == "L":
            if self.rect.left > 0:
                self.rect.left -= self.speed
            else:
                # 修改子弹的状态
                self.live = False

    # 展示子弹
    def displayBullet(self):
        # 将图片 surface加载 到窗口
        MainGame.window.blit(self.image, self.rect)

    # 我方子弹与敌方坦克的碰撞
    def myBullet_hit_enemyTank(self):
        # 循环遍历敌方坦克列表，判断是否发生碰撞
        for enemyTank in MainGame.enemyTankList:
            if pygame.sprite.collide_rect(enemyTank, self):
                # 修改敌方坦克和我方子弹的状态
                enemyTank.live = False
                self.live = False
                # 创建爆炸对象
                explode = Explode(enemyTank)
                # 将爆炸对象添加到爆炸列表中
                MainGame.explodeList.append(explode)

    # 敌方子弹与我方坦克碰撞
    def enemyBullet_hie_myTank(self):
        if MainGame.my_tank and MainGame.my_tank.live:
            if pygame.sprite.collide_rect(MainGame.my_tank, self):
                # 产生爆炸对象
                explode = Explode(MainGame.my_tank)
                # 将爆炸对象添加到爆炸列表中
                MainGame.explodeList.append(explode)
                # 修改敌方子弹与我方坦克的状态
                self.live = False
                MainGame.my_tank.live = False


class Wall():
    def __init__(self):
        pass

    # 展示墙壁的方法
    def displayWall(self):
        pass


class Explode():
    def __init__(self, tank):
        # 爆炸的位置由当前子弹打中坦克的位置决定
        self.rect = tank.rect
        self.images = [
            pygame.image.load("img/baozha0.gif"),
            pygame.image.load("img/baozha1.gif"),
            pygame.image.load("img/baozha2.gif"),
            pygame.image.load("img/baozha3.gif"),
            pygame.image.load("img/baozha4.gif")
        ]
        self.step = 0
        self.image = self.images[self.step]
        # 是否活着
        self.live = True

    # 展示爆炸效果
    def displayExplode(self):
        if self.step < len(self.images):
            # 根据索引获取爆炸对象
            self.image = self.images[self.step]
            self.step += 1
            # 添加到主窗口
            MainGame.window.blit(self.image, self.rect)
        else:
            # 修改活着的状态
            self.live = False
            self.step = 0


class Music():
    def __init__(self):
        pass

    # 播放音乐的方法
    def play(self):
        pass


if __name__ == "__main__":
    MainGame().startGame()

老师，资料里是if a.upper=='Q'是什么意思

老师，父类已经定义了公共权限的int型value，子类又重新定义一遍，是有什么特别作用或含义嘛？

老师请问，下面这段代码，返回了空的info。可以看到activeUser这个变量自从获取后都没有被用到过，没有明白这方法做了什么，还是写错了？

老师你好，请看图我在测试后发现打印出来的价格数据是没有， 但是我的数据库中的价格列数有数据的，这是为什么没有显示呢？其他的数据是正常的。

老师，请问，视频中老师一直提到IO操作，讲义中也提到IO操作可以进行阻塞，IO操作是什么呢，之前好像是学文件的时候提到过，但是没有细说