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python - 意外异常 : name 'basestring' is not defined when invoking ansible2

我正在尝试执行ansible2commnads...当我这样做时:ansible-playbook-vvv-imy/inventorymy/playbook.yml我明白了:UnexpectedException:name'basestring'isnotdefinedthefulltracebackwas:Traceback(mostrecentcalllast):File"/usr/local/bin/ansible-playbook",line85,insys.exit(cli.run())File"/usr/local/lib/python3.4/site-packages/a

Python argparse : Lots of choices results in ugly help output

我有这段代码,我通常很满意:importargparseservers=["ApaServer","BananServer","GulServer","SolServer","RymdServer","SkeppServer","HavsServer","PiratServer","SvartServer","NattServer","SovServer"]parser=argparse.ArgumentParser(description="Aprogramtoupdatecomponentsonservers.")group=parser.add_mutually_exclusiv

java - ExecutorService.submit(Runnable task, T result) 中的 'result' 有什么作用?

看看它刚刚说的javadocsFuturesubmit(Runnabletask,Tresult)SubmitsaRunnabletaskforexecutionandreturnsaFuturerepresentingthattask.TheFuture'sgetmethodwillreturnthegivenresultuponsuccessfulcompletion.Parameters:task-thetasktosubmitresult-theresulttoreturn但是它对结果有什么影响呢?它在那里存储任何东西吗?它只是使用结果的类型来指定Future的类型吗??

java - RxJava : how to compose multiple Observables with dependencies and collect all results at the end?

我正在学习RxJava,作为我的第一个实验,尝试重写thiscode中第一个run()方法中的代码(引用Netflix'sblog作为RxJava可以帮助解决的问题)使用RxJava改进其异步性,即它不会等待之前的第一个Future(f1.get())的结果继续代码的其余部分。f3依赖于f1。我知道如何处理这个问题,flatMap似乎可以解决问题:Observablef3Observable=Observable.from(executor.submit(newCallToRemoteServiceA())).flatMap(newFunc1>(){@OverridepublicObs

java.lang.NullPointerException : Attempt to invoke virtual method on a null object reference

这个问题在这里已经有了答案:WhatisaNullPointerException,andhowdoIfixit?(12个回答)关闭7年前。我正在尝试将玩家的姓名保存在共享偏好中,并通过在共享偏好中再次获取它来使其显示在另一个Activity中,但我的应用程序崩溃了。致命异常:主要Process:plp.cs4b.thesis.drawitapp,PID:1970java.lang.RuntimeException:UnabletostartactivityComponentInfo{plp.cs4b.thesis.drawitapp/plp.cs4b.thesis.drawitapp

Java条件运算符? : result type

我对条件运算符有点困惑。考虑以下两行:Floatf1=false?1.0f:null;Floatf2=false?1.0f:false?1.0f:null;为什么f1变成null,第二条语句抛出NullPointerException?Langspec-3.0第15.25段:Otherwise,thesecondandthirdoperandsareoftypesS1andS2respectively.LetT1bethetypethatresultsfromapplyingboxingconversiontoS1,andletT2bethetypethatresultsfromapp

java - Android HttpPost : how to get the result

我一直在尝试发送HttpPost请求并检索响应,但即使我能够建立连接,我仍然不知道如何获取请求响应返回的字符串消息HttpClienthttpclient=newDefaultHttpClient();HttpPosthttppost=newHttpPost("http://www.myurl.com/app/page.php");//AddyourdataListnameValuePairs=newArrayList(5);nameValuePairs.add(newBasicNameValuePair("type","20"));nameValuePairs.add(newBasi

Java 反射 : How can I get the all getter methods of a java class and invoke them

我写了一个有很多getter的java类..现在我想获取所有getter方法并在某个时候调用它们..我知道有诸如getMethods()或getMethod(Stringname,Class...parameterTypes)之类的方法,但我只想得到真正的setter/getter......,使用正则表达式?谁能告诉我?谢谢! 最佳答案 不要使用正则表达式,使用Introspector:for(PropertyDescriptorpropertyDescriptor:Introspector.getBeanInfo(yourCla

node.js - Mongoose 和 promise : how to get an array of query results?

使用mongoose从db和Q查询结果以获取promise,但发现我很难仅仅获得可用用户列表。目前我有一些类似的东西:varcheckForPerson=function(person){people=mongoose.model('Person',Person)returnpeople.findOne({"_id":person},function(err,doc){if(err)console.log(err)if(doc!==null){returndoc}else{console.log('noresults')}})}varpromises=someArrayOfIds.ma

node.js - Mongoose 和 promise : how to get an array of query results?

使用mongoose从db和Q查询结果以获取promise,但发现我很难仅仅获得可用用户列表。目前我有一些类似的东西:varcheckForPerson=function(person){people=mongoose.model('Person',Person)returnpeople.findOne({"_id":person},function(err,doc){if(err)console.log(err)if(doc!==null){returndoc}else{console.log('noresults')}})}varpromises=someArrayOfIds.ma