<bound method Employee.worked_hours of <main.Employee object at 0x000001267D03BA90>>근무시간 란에 5.5 이렇게 나오지 않고 이렇게 둘다 나오구요 프로그램은 오류없이 잘 돌아갑니다. 이게 무슨 의미일지요..

NullReferenceException: Object reference not set to an instance of an object.AspNetCore._Views_Home__TeacherTable_cshtml+d__0.MoveNext() in _TeacherTable.cshtml, line 12StackQueryCookiesHeaders NullReferenceException: Object reference not set to an instance of an object.AspNetCore._Views_Home__TeacherTable_cshtml+d__0.MoveNext() in _TeacherTable.cshtml@foreach (var teacher in Model.Teachers)System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)Microsoft.AspNetCore.Mvc.Razor.RazorView+d__16.MoveNext()Student.cshtml이라는 View에서는 TeacherStudentViewModel을 데이터를 받아 Teacher 리스트를 모두 출력해주게 되어있는데, Student.cshtml의 FORM으로 전달하는 Controller내의 액션 로직에는 View()만 리턴하여 Teacher 데이터부분이 NULL이라 에러가 뜨는 것 같습니다.이런 경우에 어떻게 해결하나요?하나의 View Page에 ViewModel이 필요할 수도 ViewModel이 필요없을 수도 있는 상황에는 어떻게 처리하나요?

강의 잘 듣고있습니다! 강의 자료를 받고 싶은데요! 가능한지요~? ppt요!

디시 갤러리 같은데 보면captcha? 를 통과해야 글을 쓸 수 있는데그런것은 현재 기술로는 불가능한건가요??디시 갤러리 같은데 홍보하는 글 같은것을 주기적으로 쓰고 싶어서요 (불법인가요??)

nslookup zonetransfer.me 에서 나온 서버와 어드레스 정보가 무엇인지 궁금합니다.dnsenum에서 나온 정보와 매칭되는게 없어서요

for key, val in dict.items(): print(key, val)위 코드에서 key, val가 Packing에 해당하나요?

문자열 다루기(String)8분 14초 쯤에 문자열 뺄셈 연산이 가능하다 되어 있는데요.강의 자료 비디오에 뺄셈 예시가 안나와서요.뺄셈 연산이 없는 걸로 알고 있는데 확인 부탁드립니다.감사합니다.

소스코드 파일은 어디에서 볼수있나요?답변부탁드려요ㅠㅠ

"error" : "ElasticsearchIllegalArgumentException[failed to execute script]; nested: ScriptException[scripts of type [inline], operation [update] and lang [grovy] are disabled]; ","status" : 400이라고 에러나는데 왜그런거죠ㅠㅠ?

HTTP 404 뜨는데 저만 그런건가요

이건 틀리기엔 너무 기본적인 내용 아닌가요수업 시작도 아니고 오리엔테이션부터 틀린 내용 보면서 앞으로 수업을 믿고 들어도 되는지 걱정이 되네요

갑자기 궁금하네요 ㅎ

linear_model.LinearRegression 에서 iteration은 어떻게 정해지는지 궁금합니다.Gradient Descent 류의 방법을 사용하여 Regression한 것 같은데, iteration 수는 어떻게 정해 질까요?sci-kit learn 공식 홈페이지에 따로 설명은 없었습니다.

http://toutt123.dothome.co.kr/showw.html 위에 링크에 이미지처럼 cell이 그래요. 코드 확인했는데 어디가 잘못된건지 잘 모르겠습니다

부모의 좌표를 받아서 해와 달을 스페이스바를 누를때 부모에게로 모이도록 하고싶습니다.public class move : MonoBehaviour {public Transform targetTransform;void Start () {}void Update () { if (Input.GetKey(KeyCode.Space)) { Move(); }}void Move(){ Vector3 direction = targetTransform.position; transform.Translate(direction * Time.deltaTime);}했는데 아무런 움직임이 없어요 ㅠㅠ

Traceback (most recent call last): File "C:/Python_Study/14. Advanced reading and writing file.py", line 43, in emp.name,emp.work_start,emp.work_finish,emp.wage_per_hour,emp.worked_hours(),emp.wage_of_the_day() File "C:/Python_Study/14. Advanced reading and writing file.py", line 23, in wage_of_the_day return self.worked_hours()self.wage_per_hour TypeError: unsupported operand type(s) for : 'NoneType' and 'int' 이런 에러가 납니다. 내용은 영상과 종일하게 넣은거같은데 뭐가 문젠지 잘 모르겠네요 int선언을 안해준 것인지.. ============================================================================= 추가적으로 이것저것 해보다보니 if식에서 if worked_hours>4 로 하면 위와같은 에러가 나는데 if worked_hours >=4 로 하면 에러가 안나네요..

remove(int index) 메소드 구현에 있어서 잘못된 부분이라 생각되는 부분을 올립니다.if (index ==0) ... else {...} 로 구현해야 된다고 생각합니다.전체 예문은 아래와 같습니다.public T remove(int index) { // delete if (index < 0 || index >= size) return null; if (index == 0) return removeFirst(); else { Node<T> prev = getNode(index-1); return removeAfter(prev); }}

어떻게 이렇게 아름답게 코딩할 수 있는지 감탄이 절로 나옵니다.

Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.Thu Jun 14 00:00:33 KST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.java.sql.SQLException: The server time zone value '´???¹?±¹ ???ؽ?' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:127)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:87)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:61)at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:71)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:76)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:862)at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:444)at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:230)at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:226)at java.sql.DriverManager.getConnection(Unknown Source)at java.sql.DriverManager.getConnection(Unknown Source)at util.DatabaseUtil.getConnection(DatabaseUtil.java:14)at user.UserDAO.join(UserDAO.java:14)at org.apache.jsp.userJoinAction_jsp._jspService(userJoinAction_jsp.java:139)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source)Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value '´???¹?±¹ ???ؽ?' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:59)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:83)at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:128)at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2201)at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2225)at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1391)at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:993)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:852)... 36 morejava.lang.NullPointerExceptionat user.UserDAO.join(UserDAO.java:15)at org.apache.jsp.userJoinAction_jsp._jspService(userJoinAction_jsp.java:139)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:386)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:330)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source)

리소스 & 스크립트를 눌러도 아무 반응이 없네요. 수정해주시면 감사하겠습니다.