可能重复:
Python"is"运算符使用整数意外运行

今天我试着调试我的项目,经过几个小时的分析,我得到了这个:

>>> (0-6) is -6
False

但,

>>> (0-5) is -5
True

你能解释一下,为什么？也许这是某种错误或非常奇怪的行为.

> Python 2.7.3 (default, Apr 24 2012, 00:00:54) [GCC 4.7.0 20120414 (prerelease)] on linux2
>>> type(0-6) 
<type 'int'>
>>> type(-6) 
<type 'int'>
>>> type((0-6) is -6)
<type 'bool'>
>>> 

我坚持这个问题,我无法解决它.

码:

 ConnectionConfiguration config = new ConnectionConfiguration(host, port);
        config.setDebuggerEnabled(true);
        config.setSASLAuthenticationEnabled(true);
        config.setSecurityMode(ConnectionConfiguration.SecurityMode.enabled);

        XMPPConnection connection = new XMPPConnection(config);
try{
            connection.connect();
            connection.login(login, password);
            //auth.authenticate(login, password, host);
        }
        catch (XMPPException exc){
            exc.printStackTrace();
        }

完整堆栈跟踪:

/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/bin/java -Didea.launcher.port=7544 "-Didea.launcher.bin.path=/Applications/IntelliJ IDEA 11 CE.app/bin" -Dfile.encoding=UTF-8 -classpath "/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/deploy.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/javaws.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/jce.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/plugin.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Classes/charsets.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Classes/classes.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Classes/jsse.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Classes/ui.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/ext/apple_provider.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/1.6.0_35-b10-428.jdk/Contents/Home/lib/ext/sunpkcs11.jar:/Users/dmitry/IdeaProjects/smacker/target/classes:/Users/dmitry/IdeaProjects/smacker/lib/smack-3.2.1.jar:/Users/dmitry/IdeaProjects/smacker/lib/smackx-3.2.1.jar:/Applications/IntelliJ IDEA 11 CE.app/lib/idea_rt.jar" com.intellij.rt.execution.application.AppMain Main
Connection failed. No response from server.: 
    at org.jivesoftware.smack.PacketReader.startup(PacketReader.java:119)
    at org.jivesoftware.smack.XMPPConnection.initConnection(XMPPConnection.java:568)
    at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:527)
    at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:953)
    at SessionsHandler.openSession(SessionsHandler.java:62)
    at Main.main(Main.java:16)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Smack调试输出:

在:

<stream:stream to="xmpp.odnoklassniki.ru" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0"> …

可能重复：
如何在Python中便宜地获得行数？

美好的一天。我下面有一些代码，该代码实现每行文件读取和计数器迭代。

def __set_quantity_filled_lines_in_file(self):
    count = 0
    with open(self.filename, 'r') as f:
        for line in f:
             count += 1
    return count

我的问题是，有没有方法可以确定当前文件中没有每一行迭代的文本数据行数？

谢谢！

我正在尝试使用grpc来实现pub sub模式，但是我对如何正确地做到这一点感到困惑。

我的原型： rpc call (google.protobuf.Empty) returns (stream Data);

客户：

asynStub.call(Empty.getDefaultInstance(), new StreamObserver<Data>() {
         @Override
         public void onNext(Data value) {
           // process a data

         @Override
         public void onError(Throwable t) {

         }

         @Override
         public void onCompleted() {

         }
       });

   } catch (StatusRuntimeException e) {
     LOG.warn("RPC failed: {}", e.getStatus());
   }

   Thread.currentThread().join();

服务器服务：

public class Sender extends DataServiceGrpc.DataServiceImplBase implements Runnable {
  private final BlockingQueue<Data> queue;
  private final static HashSet<StreamObserver<Data>> observers = new LinkedHashSet<>();

  public Sender(BlockingQueue<Data> queue) {
    this.queue = queue;
  }

  @Override
  public …

Disruptor github地址为：https://github.com/LMAX-Exchange/disruptor

我对其进行了一个简单的测试，如下所示：

public class DisruptorMain {
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static void main(String[] args) throws Exception {
        class Element {

            private int value;

            public int get() {
                return value;
            }

            public void set(int value) {
                this.value = value;
            }

        }

        ThreadFactory threadFactory = new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                return new Thread(r, "simpleThread");
            }
        };

        EventFactory<Element> factory = new EventFactory<Element>() {
            @Override
            public Element newInstance() {
                return new Element();
            }
        };

        EventHandler<Element> handler = …