小编see*_*ker的帖子

Python exit(0)和exit(1)Python 之间的区别是什么？

我试着环顾四周,但没有在这些方面找到具体的问题.如果它已经被回答,那么链接就足够了.

我在Ubuntu上尝试一些代码.我正在尝试运行以下代码

#include <cstdlib>
#include <cmath>
#include <ctime>
#include "random.h"

using namespace std;

/* Function prototype! */
void initRandomSeed();

int randomInteger(int low,int high){
    initRandomSeed();
    double d= rand()/(double(RAND_MAX)+1);
    double s= d*(double(high)-low+1);
    return int(floor(low)+s);    
}

double  randomReal(int low,int high){
    initRandomSeed();
    double d=rand()/(double(RAND_MAX)+1);
    double s=d*(double(high)-low+1);
    return low+s;
}    

bool randomChance(double p){
    initRandomSeed();
    return randomReal(0,1)<p;
}            

void setRandomSeed(int seed){    
    initRandomSeed();
    srand(seed);
}    

void initRandomSeed(){
    // to retain updated values across different stack frames! nice!
    static bool initialized=false;

    // this is executed only very first time …

我似乎无法在Mac OS X mavericks上找到本地.m2文件夹.理想情况下应该是,{user.home}/.m2但我似乎无法找到它.

我应该创建吗？

以下链接解释了它.
据说该实现通过存储前一个和下一个地址(比如nxp)的XOR而不是分别存储两个(前一个和下一个地址)来工作.但是,进一步沿着实现被称为通过xor-ing先前的地址工作和nxp,以获得下一个地址.

但这实际上是否使用 与前一个和下一个指针相同的空间？

以下语句究竟在Python中意味着什么？

randrange(10**10) for i in range(100)

我知道这randrange是一个随机数生成器,但不能真正弄清楚语句的效果.

我正在尝试按照此处的示例开发示例facebook php登录示例

我在这里托管了我的应用程序,但每当我尝试访问该链接时,我都会在问题中收到错误消息.这是抛出错误的代码段

try {
  $e = new FacebookApiException(array(// LINE 887
             'error_code' => curl_errno($ch),
             'error' => array(
             'message' => curl_error($ch),
             'type' => 'CurlException',
        ),
  ));
  curl_close($ch);
}

// edit suggested by Kneel-before ZOD
catch(FacebookApiException $e) {
  $result = $e->getResult();
  echo 'Got an : ', $e->getType(),' while posting';
  echo(json_encode($result));
}

catch(Exception $e){
  echo 'Caught exception: ',  $e->getMessage(), "\n";
}

我很确定我已经在index.php中正确设置了APP ID和密码.

这是我在Facebook上的应用程序设置的屏幕截图

任何帮助,将不胜感激.谢谢!

我正在尝试设置一个我在这里找到的Hibernate的小工作示例但是当我运行代码时我得到了以下错误

Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not insert: [com.sample.Person]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2345)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2852)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
at .....


Caused by: org.postgresql.util.PSQLException: ERROR: relation "person" does not exist
Position: 13
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
... 23 more

但是我已经在数据库中有一个名为person的表,这里是我修改过的hibernate.cfg.xml

    <!-- hibernate dialect -->
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>


    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="hibernate.connection.url">jdbc:postgresql://localhost/testDB</property>
    <property name="hibernate.connection.username">postgres</property>
    <property name="hibernate.connection.password"></property>
    <property …

所以我有一个如下的代码片段。我试图找出为什么它抛出FileNotFoundException。

File file= new File (WORKSPACE_PATH+fname);
FileWriter fw;
if (file.exists())
{
     fw = new FileWriter(file,true);//if file exists append to file. Works fine.
}
else
{
     fw = new FileWriter(file);// If file does not exist. Create it. This throws a FileNotFoundException. Why? 
}

我正在参加算法的在线课程,并尝试实现一个在数字列表中查找反转次数的mergesort实现.但是,由于返回的反转次数明显低于我在执行暴力攻击时所获得的数量,因此无法确定我的实施方式是错误的.我已经将我的mergesort方法的实现放在下面

 /**
   * 
  */

 package com.JavaReference;

 import java.io.BufferedReader;
import java.io.FileReader;
 import java.io.IOException;

public class ReadFile {


public static void main(String args[]){
    int count=0;
    Integer n[];


int i=0;
    try{
    n=OpenFile();
    int num[] = new int[n.length];

    for (i=0;i<n.length;i++){
        num[i]=n[i].intValue();
    //  System.out.println( "Num"+num[i]);
    }
    count=countInversions(num);


    }
    catch(IOException e){
        e.printStackTrace();
    }

    System.out.println(" The number of inversions"+count);


}




 public static Integer[] OpenFile()throws IOException{

    FileReader fr=new FileReader("C:/IntegerArray.txt");// to put in file name.

BufferedReader textR= new BufferedReader(fr);
int nLines=readLines();
System.out.println("Number of lines"+nLines);

Integer[] nData=new Integer[nLines];
for (int …

我正在写一个小片段,它抓住所有以python中的大写字母开头的字母.这是我的代码

def WordSplitter(n):
    list1=[]
    words=n.split()
    print words

    #print all([word[0].isupper() for word in words])
    if ([word[0].isupper() for word in words]):
        list1.append(word)
    print list1

WordSplitter("Hello How Are You")

现在我运行上面的代码.我希望该列表将包含字符串中的所有元素,因为其中的所有单词都以大写字母开头.但这是我的输出:

@ubuntu:~/py-scripts$ python wordsplit.py 
['Hello', 'How', 'Are', 'You']
['You']# Im expecting this list to contain all words that start with a capital letter