제일 처음 전역변수 선언할때의 instance의 개념이 조금 이해가 안됩니다.어디에서 어떤식의 return값이 들어오는지 혹시 간단히 설명해 주실수 있으신지요.조금 더 자세하게 묻는다면RealEstate.deployed().then(function(instance){ app = instance; })위의 전역 변수 app 초기화에서 instance는 어디서 불려와서 return된 값인지.또 app전역 변수는 어떻게 스마트컨트랙트의 function들을 참조 가능하게 되는지를간단히 알고 싶습니다.

안녕하세요.저는 mac으로 사용하고 있는데, geth attach ipc:\.pipegeth.ipc로는 접근이 불가능 한 상태입니다. mac에 맞는 다른 명령어를 안내 받을 수 있나요??

ERR_CONNECTION_REFUSED(http://localhost:8080/)메시지만 포함한 에러가 표시됩니다. 포트쪽 문제 같은데 이경우 어떻게 하나요?그리고 강의가 중간중간 사소한 부분에 설명이 너무 부족하네요.

def is_positive_number(integer_str_value):try: integer_str_value = int(integer_str_value) if int(integer_str_value) > 0: return True else: return False # ==================================except ValueError: return Falsedef get_factorial_value(integer_value):factorial = 1for i in range(1, integer_value+1):factorial = factorial * ireturn factorialdef main():user_input = 999while user_input is not 0:user_input = input("Input a positive number : ") if is_positive_number(user_input): integer_value = int(user_input) result = get_factorial_value(integer_value) print(result) elif user_input is '0': print("Thank you for using this program") break else: is_positive_number(user_input) print("Input again, Please")if name == "main":main()

안녕하세요 강의 정말 잘 듣고 있습니다. 실습 도중 다름이 아니라 wordcloud를 임포트 하였는데, 에러 창에 No module named 'wordcloud'라고 나옵니다.아나콘다에서 쥬피터 노트북을 사용하고 있어서, Anaconda Navigator - Environments 에서 wordcloud를 검색하였는데 이것도 뜨지 않아 어떻게 해결할 수 있나 질문드립니다 :)) 좋은 강의 해주셔서 정말 감사합니다.

box collider를 할때는 동영상처럼 됐는데 mesh collider로 하니까 적용하기 전처럼 계속 내려가기만 하네요.이건 뭐가 문제인가요?

인터넷에 찾아 보니 계정에는 외부 소유 계정과 컨트랙트 계정이 있다고 알고 있습니다. 강의중에 부동산 거래에 의한 송금을 받는것이 외부 소유 계정이라면 컨트랙트 계정은 언제 사용 되나요. 제 기억이 맞다면 강의중에 컨트랙트라고 얘기 하셨지 단 한번도 스마트 컨트랙트라는 용어가 사용되지 않았던걸로 기억 합니다. 그리고 후속 강좌는 언제 개설 되나요? 많이 기다리고 있는 학생입니다. 감사합니다.

@SpringBootApplicationpublic class SpringinitApplication { public static void main(String[] args) { new SpringApplicationBuilder() .sources(SpringApplication.class) .run(args); }}소스코드를 위와 같이 설정했는데 run 하면 banner뜨고 로그 뜨다가 2018-08-04 00:08:12.228 ERROR 20688 --- [ main] o.s.boot.SpringApplication : Application run failedorg.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.이런 에러 메시지가 뜨는데 이유를 잘 모르겠어서 질문을 남겨봅니다

리워드 애즈에는 스킵이 없는데그러면 리워드 애즈의 스크립트에는 스킵에 관련된 부분은 없어도 되나요?

dotnet core 2.1에서 dotnet ef migrations add Initial을 사용하면정상적으로 폴더와, 파일이 생성은 되는데 Migraions 파일에 보면 Snapshot, Initial Class의 함수내의 내용들이 전부 비워져 있는데, 혹시 어떻게 해야 동영상의 내용처럼 함수 내용들이 생성될까요?

(사진)

강의 잘 보고 있습니다 ^^ 그런데 뒷부분이 잘려가지고 볼 수 없어 이렇게 남깁니다. ${random.int(10,20)} 이렇게 콤마(,) 뒤에 공백을 안남겨야지 int 로 인식하는 것 같습니다. 혹시 잘린 뒷 부분 다시 올려주실 수 있으신가요 ? ㅠㅠ 감사합니다 !

구글 드라이브에 있는 ova를 다운 받으려고 하니 정상적으로 다운이 안되는거 같은데각자 우분투에 설치할 수 있도록 기본 설정하는 방법을 영상으로 따로 올려주시거나자료로 첨부해주실수 있으신가요??다같이 기본설정을 맞춰서 수업을 진행 하는것도 중요하지만수업 듣는 사람들이 기본설정하는 방법을 아는것 또한 중요하다고 생각이 들어서요.

회원가입화면에서 에러납니다.에러코드'''javax.naming.NameNotFoundException: Name [jdbc/Oracle11g] is not bound in this Context. Unable to find [jdbc].at org.apache.naming.NamingContext.lookup(NamingContext.java:825)at org.apache.naming.NamingContext.lookup(NamingContext.java:159)at org.apache.naming.NamingContext.lookup(NamingContext.java:836)at org.apache.naming.NamingContext.lookup(NamingContext.java:159)at org.apache.naming.NamingContext.lookup(NamingContext.java:836)at org.apache.naming.NamingContext.lookup(NamingContext.java:173)at org.apache.naming.SelectorContext.lookup(SelectorContext.java:156)at javax.naming.InitialContext.lookup(Unknown Source)at com.javalec.ex.MemberDao.getConnection(MemberDao.java:209)at com.javalec.ex.MemberDao.confirmId(MemberDao.java:71)at org.apache.jsp.joinOk_jsp._jspService(joinOk_jsp.java:104)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1136)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)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)java.lang.NullPointerExceptionat com.javalec.ex.MemberDao.confirmId(MemberDao.java:72)at org.apache.jsp.joinOk_jsp._jspService(joinOk_jsp.java:104)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1136)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)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)java.lang.NullPointerExceptionat com.javalec.ex.MemberDao.confirmId(MemberDao.java:84)at org.apache.jsp.joinOk_jsp._jspService(joinOk_jsp.java:104)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1136)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)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)javax.naming.NameNotFoundException: Name [jdbc/Oracle11g] is not bound in this Context. Unable to find [jdbc].at org.apache.naming.NamingContext.lookup(NamingContext.java:825)at org.apache.naming.NamingContext.lookup(NamingContext.java:159)at org.apache.naming.NamingContext.lookup(NamingContext.java:836)at org.apache.naming.NamingContext.lookup(NamingContext.java:159)at org.apache.naming.NamingContext.lookup(NamingContext.java:836)at org.apache.naming.NamingContext.lookup(NamingContext.java:173)at org.apache.naming.SelectorContext.lookup(SelectorContext.java:156)at javax.naming.InitialContext.lookup(Unknown Source)at com.javalec.ex.MemberDao.getConnection(MemberDao.java:209)at com.javalec.ex.MemberDao.insertMember(MemberDao.java:38)at org.apache.jsp.joinOk_jsp._jspService(joinOk_jsp.java:113)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1136)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)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)java.lang.NullPointerExceptionat com.javalec.ex.MemberDao.insertMember(MemberDao.java:39)at org.apache.jsp.joinOk_jsp._jspService(joinOk_jsp.java:113)at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1136)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)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)'''

마지막 부분에서 코드예제로 일반 class와 data class의 nested class로 Subject라는 data class를 만드시고 출력하실때는 student.subject?.english 라고 적으셨는데 subject가 아니라 Subject가 되어야 하는 것 아닌가요? 일반 student class에서도 student.subject라고 사용하셨는데 student.Subject가 아니여도 인식하는 건가요?

truffle(ganache)> app.owner.call()TypeError: Cannot read property 'call' of undefined앞부분부터 강의를 하나씩 따라왔는데 어떤것이 잘못되었는지 잘 모르겠네요..

강사님 좋은 강의 잘 듣고 있습니다. pc vmware 우분투를 이용해서 강의를 듣고 있습니다. git 분석 gitstory 강좌에서 설명 하신대로 gistory는 잘 설치 된거 같습니다. 그러나 gistory라는 command를 입력하면 command not found라는 메세지가 뜨는데 어떻게 해결 하는지 궁금해서 질문드립니다.

위의 코드를 썼는데 왜 바다소가 지워졌나요? []안의 수가 animal list 안의 차례아닌가요? 바다소는 2번째에 있는데요.

제목 처럼 나와야 하는데,, 아래처럼 다음 칸에 입력이 되네요... 간신히 통과는 한거 같은뎅 ㅋ과목수를 입력하세요 :3✔ Build finished. (exit code = 0)과목수를 입력하세요 :과목수를 입력하세요 :과목수를 입력하세요 :Generating result sheet... Test Case | Passed? | Feedbacktest_get_average_score | PASSED | Good Jobtest_get_number_of_subjects | PASSED | Good JobReading source file...Transferring results to server...Transfer completed.✔ Finished. (exit code = 0)

소스코드는 하기와 같이 붙였습니다.def is_positive_number(integer_str_value): try: if int(integer_str_value) > 0: return True else: return False except ValueError: return Falsedef get_factorial_value(integer_value): result = 1 for i in range(1, integer_value+1): result = result * i return resultdef main(): integer_str_value = input('Input a positive number : ') while True: if integer_str_value == '0': print("Thank you for using this program") break elif is_positive_number(integer_str_value) == False: print('Input again, Please') integer_str_value = input('Input a positive number : ') else: result = get_factorial_value(int(integer_str_value)) return result break