Ini adalah suatu pilihan

Overloading

2011-10-25T08:53:00.000-07:00

Can not believe it for an overloading in programming OOP (Object Oriented Programming), It was very in need in a class called repeatedly with different parameters in the same class and the same method, it does not mean overriding. As in VB.Net:

different from the python, in python there are several constructors, but it's rather difficult when compared to Java or Dot Net. like the __init__ constructor, the constructor can not be overloading the constructor of the same name before, just be overloading the operator or by the same constructor, but do not know in their use?
misalnya seperti :

class com:
   def __init__(self):
       print "original constructor"
   def __init__(self, val1):
       print "second overloading"
   def __init__(self, val1, val2):
       print "thrid overload"

this is wrong. because in python does not apply to any such provisions.

What about python?

Overview of PyPy

2011-09-21T23:59:00.000-07:00

This may be foreign to you, but this is a fact. PyPy is a Python programming language interpreter written in Python and is equipped with a JIT compiler (just in time). PyPy development focuses on the speed of program performance, efficiency, and maintain compatibility with CPython interpreter. Using Python in PyPy development, the developers PyPy allows hacking of its implementation and identify any areas that require improvement. PyPy fact currently implemented as a high level language makes it more flexible and easier in the experiment when compared to CPython, and also allows developers to experiment on some form of implementation of certain specific features.

PyPy translation model also provides a general framework for developing and supporting forms to create a dynamic programming language, providing a clear separation between the specification of a programming language with aspects and forms of implementation. In addition, the PyPy provides a programming language Python that is compatible with CPython with the flexibility and level of performance is better.

whether it can be concluded that the programming language compilers much faster?

Read an XML file in Java

2011-03-20T08:41:00.000-07:00

For previously been discussed about how to convert data to xml, we now discuss for how to parse xml. This is a simple way for parsing the xml file.
The following example code :
XML File :

Output :

Java Code:

There are better implementations of reading XML files which would work for any XML file. The above one would require a few changes every time the XML tag names change. But this is much more simpler than the other programs.

Entity on Programming

2011-02-23T08:20:00.000-08:00

Entity is an object whose existence can be distinguished against other objects. Entities can be people, objects, places, events, concepts. Example :

People: STUDENTS, LECTURERS, SUPPLIER, VENDOR
Objects: CAR, ENGINE, ROOM
Venue: THE STATE, THE VILLAGE, KAMPONG
Genesis: SALES, REGISTER
Concept: ACCOUNT, COURSE

An entity has a number of attributes

Example: The student has the name and address

Entity set is aa set of entities that share the same attributes

In programming OOP (Object Oriented Programming) or object-oriented Programming is a new way of thinking and logic in dealing with the problems that will try to overcome with the help of computers. OOP, unlike its predecessor (Structured Programming), trying to see problems through observation of the real world where every object is a single entity that has a combination of data structures and specific functions. This contrasts with structured programming where data structures and functions are defined separately and are not closely related.
it can be explained in the following code fragment:

in Python

in Java

hopefully useful for those who love OOP

Create File XML

2011-01-31T08:48:00.000-08:00

Extensible Markup Language (XML) is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications.

The material in this section is based on the XML Specification. This is not an exhaustive list of all the constructs which appear in XML; it provides an introduction to the key constructs most often encountered in day-to-day use. XML documents may begin by declaring some information about themselves, as in the following example.

In Java, two built-in XML parsers are available – DOM and SAX, both have their pros and cons. Here’s few examples to show how to create, modify and read a XML file with Java DOM, SAX and JDOM xml parser.

The DOM interface is the easiest to understand. It parses an entire XML document and load it into memory, modeling it with Object for the traversal. DOM Parser is slow and consume a lot memory if it load a XML document which contains a lot of data.

now we try to create XML files using XML DOM Parser.

results :

XML file can be edited for each element in its node can query the results table. XML file from the query table.

Try to JTree

2010-12-11T08:18:00.000-08:00

Time for us to play with JTree, and how to take the label of the JTree. We try to connect your with MySql database, and read all the databases, tables, and each column name.

Screen :

Call Font Face into ComboBox

2010-12-03T00:04:00.000-08:00

Long time no write off my blog. Today wanted to write, how to call the font and inserted into the ComboBox in Java. Code more or less like this:

output :

if you trouble in making the GUI in Java, you can use Jigloo to help make the creation GUI. Congratulations to give it a try.

Connection Python to SQLite

2010-09-22T00:53:00.000-07:00

SQLite is a in-process library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. The code for SQLite is in the public domain and is thus free for use for any purpose, commercial or private. SQLite is currently found in more applications than we can count, including several high-profile projects.

SQLite is an embedded SQL database engine. Unlike most other SQL databases, SQLite does not have a separate server process. SQLite reads and writes directly to ordinary disk files. A complete SQL database with multiple tables, indices, triggers, and views, is contained in a single disk file. The database file format is cross-platform - you can freely copy a database between 32-bit and 64-bit systems or between big-endian and little-endian architectures.

The SQLite library is a light-weight embedded SQL engine, with a nice DB-API compliant Python binding, originally developed by Michael Owens.

A newer version, called sqlite3, was added to Python’s standard library in Python 2.5 to up.

Pythagorean Theorem

2010-05-24T01:30:00.000-07:00

If you are on school and you are taking algebra like me or just want to find the missing length of one side of the triangle than this program should help you out. Pythagorean Theorem is great and extremely essay to use.
We can find the side of a triangle using the Pythagorean algorithm. This uses the Python programming language.

def menu():
      #print the options you have
      print " "
      print "Welcome to Pythagorean Theorem"
      print "Please keep in mind that for this program to work you need the lenght of two side of the triangle"
      print " "
      print "Your Options Are:"
      print " "
      print "1) If you have the lenght of A and B"
      print " "
      print "2) If you have the lenght of C and A"
      print " "
      print "3) If you have the lenght of C and B"
      print " "
      print "4) Quit Pythagorean Theorem"
      print " "
      return input ("Choose your option: ")

from math import *
      #On this one we have the lenght of A and B and we are trying to find the lenght of C
def AnB(a,b):
      print a**2, "+", b**2, "=", a**2 + b**2
      print sqrt(a**2 + b**2)
      #On this one we have the lenght of A and C and we are trying to find the lenght of B
def CnA(c,a):
      print c**2, "-", a**2, "=", c**2 - a**2
      print sqrt(c**2 - a**2)
      #On this one we have the lenght of B and C and we are trying to find the lenght of A
def CnB(c,b):
      print c**2, "-", b**2, "=", c**2 - b**2
      print sqrt(c**2 - b**2)
      #Code is Run
loop = 1
choice = 0
while loop == 1:
      choice = menu()
      if choice == 1:
            AnB(input("A: "),input("B: "))
      elif choice == 2:
            CnA(input("C: "),input("A: "))
      elif choice == 3:
            CnB(input("C: "),input("B: "))
      elif choice == 4:
            loop = 0
print "Thankyou fo using Pythagorean Theorem"

Honest Face

Class Inheritance

2010-04-22T04:15:00.000-07:00

Use __class__, __bases__ and __dict__ for sub and super class

inheritance learn python programming language, Python is very simple. Now using __class__, __bases__ and __dict__ for sub and super class. Try making a super class and child class. Examples like this:

class super:
         def hello(self):
               self.data1 = 'spam'

class sub(super):
         def hola(self):
                self.data2 = 'eggs'

X = sub()
X.__dict__
{}

print X.__class__

print sub.__bases__

print super.__bases__

Y = sub()

X.hello()
print X.__dict__

X.hola()
print X.__dict__

print sub.__dict__

print super.__dict__

print sub.__dict__.keys(), super.__dict__.keys()

print Y.__dict__

print X.data1, X.__dict__['data1']

X.data3 = 'toast'
print X.__dict__

X.__dict__['data3'] = 'ham'
print X.data3

print X.__dict__
print X.__dict__.keys()

print dir(X)
print dir(sub)
print dir(super)

Result

BubbleSort

2010-02-09T23:26:00.000-08:00

Algorithm BubbleSort is a simple sorting algorithm, it works by repeatly stepping through the list to be sorted, comparing each pair of adjacent items and swapping them if they are in the wrong order. The pass through the list is repeated until no swaps or needed, which indicates that the list is sorted. The algorithm gets its name from the way smaller elements "bubble" to the top of the list.

For Example :

import java.util.*;

class node1 {
int data;
node1 next, prev;

public node1(int n) {
data = n;
next = prev = null;
}
}

//Class list
class list {
node1 head, tail;

public list() {
head = tail = null;
}

void addLast(int n) {
node1 input = new node1(n);
if (head == null) {
head = tail = input;
} else {
tail.next = input;
input.prev = tail;
tail = input;
}
}
// for sorting
void sorting() {
node1 once = head, second = head, vloop = head;
while (vloop != tail) {
once = head;
while (once != null) {
second = once.next;
if (second != null) {
if (second.data < once.data)
vchange(once, second);
} once = once.next;
} vloop = vloop.next;
}
}
void vchange(node1 once, node1 second) {
int temp = second.data;
second.data = once.data;
once.data = temp;
}
void vprint() {
node1 temp = head;
while (temp != null) {
System.out.print(temp.data + " ");
temp = temp.next;
}
}
}
//main class
public class BubleSort {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Total by sorting : ");
int n = input.nextInt();
list vnumber = new list();

System.out.println("Input number :");
for (int i = 0; i < n; i++) {
System.out.print(">> ");
int a = input.nextInt();
v_number.addLast(a);
}

System.out.println("Sort by Ascending :");
for (int i = 0; i < n - 1; i++) {
vnumber.sorting();
}
vnumber.vprint();
System.out.println();
}
}

Binary Search

2010-02-05T01:14:00.000-08:00

Algorithm Binary Search

package myPackage;

import java.util.Scanner;

class ArrayQ {
int[] data;
int pj;

public ArrayQ(int ArrayQ) {
data = new int[ArrayQ];
pj = 0;
}

void insert(int angka) {
int i;
for (i = 0; i < pj; i++) {
if (data[i] > angka)
break;
}

for (int j = pj; j > i; j--) {
data[j] = data[j - 1];
}
data[i] = angka;
pj++;
}

void display() {
for (int i = 0; i < pj; i++)
System.out.print(data[i] + " ");
System.out.println();
}

void searching(int key) {
System.out.println("\nFind Value Process " + key);

int bawah = 0;
int tengah;
int atas = pj - 1;

while (atas >= bawah) {
tengah = (bawah + atas) / 2;
if (data[tengah] == key) {
System.out.println("Status : Found!!");
return;
} else {
if (data[tengah] < key)
bawah = tengah + 1;
else
atas = tengah - 1;
}
}

System.out.println("Status : not found!!");
}
}

public class BinarySearch2 {
public static void main(String[] args) {
System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
System.out.println(" Binary Search\n ");
System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
Scanner input = new Scanner(System.in);
System.out.print("Sum Value = ");
int jumlah = input.nextInt();

ArrayQ list;
list = new ArrayQ(sumValue);

System.out.println("input value :");
int[] val = new int[sumValue];
for (int i = 0; i < sumValue; i++) {
System.out.print(">> ");
val[i] = input.nextInt();
list.insert(val[i]);
}

list.display();
System.out.println("\nFind : ");
int search = input.nextInt();

list.searching(search);
// System.out.println(“Status : Found!!”);
// System.out.println(“Status : not Found!!”);

System.out.println();
}
}

good luck

Search Linier

2010-02-05T00:40:00.000-08:00

Algorithma Search Linier,...
you can to try

package myPackage;

import java.util.Scanner;
//class node for found index
class Node {
int data, index;
Node next;

public Node(int data, int index) {
this.data = data;
this.index = index;
}
}
// i'm use linklist
class LinkedList {
Node head, tail;

void addLast(int nilai, int id) {
Node input = new Node(nilai, id);

if (head == null) {
head = tail = input;
} else {
tail.next = input;
tail = input;
}
}

void display() {
Node temp = head;
while (temp != null) {
System.out.print(temp.data + " ");
temp = temp.next;
}
}

void searching(int key) {
Node temp = head;
System.out.println("\nProses Pencarian Angka " + key);
while (temp != null) {
if (temp.data == key) {
System.out.println("Status : ditemukan di indeks ke-"
+ temp.index);
break;
} else
temp = temp.next;
}
if (temp == null)
System.out.println("Status : tak ditemukan!!");

}
}

public class LinearSearch {
public static void main(String[] args) {
System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
System.out.println(" Linear Search\n ");
System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");

LinkedList list = new LinkedList();
Scanner input = new Scanner(System.in);
System.out.print("Jumlah angka = ");
int jumlah = input.nextInt();
input = new Scanner(System.in);
System.out.println("Masukkan angka :");
int angka;
for (int i = 0; i < jumlah; i++) {
System.out.print(">> ");
angka = input.nextInt();
list.addLast(angka, i); // nama team disimpan dalam queue
}

list.display();
System.out.print("\nDicari : ");
int cari = input.nextInt();
list.searching(cari);
System.out.println();
}
}

good luck for you

Maximum value 1st, 2nd

2009-12-20T07:29:00.000-08:00

Maximum value can with method as this code:

public class Array
{
public void getMax( double ar[] )
{
double max1 = ar[0]; // Assume the first
int ZERO = 0; // Variable to store inside it the index of the max value to set it to zero.

for( int i = 0; i <>= max1)
{
max1 = ar[i];
ZERO = i;
}
}

ar[ZERO] = 0; // Set the index contains the 1st max to ZERO.
double max2 = ar[0]; // element in the array

for( int j = 0; j <>= max2 )
{
max2 = ar[j];
ZERO = j;
}
}

System.out.println("The 1st maximum element in the array is: " + max1 + ", the 2nd is: " + max2);
}

public static void main(String[] args)
{
// Creating an object from the class Array to be able to use its methods.
Array myArray = new Array();
// Creating an array of type double.
double a[] = {6.6,2.2, 3.4, 5.5, 5.5, 5.6};

myArray.getMax( a ); // Calling the method that'll find the 1st max, 2nd max.
}

}

This code can increase with Array 3nd etc.

A simple Login with Dictionary (Python)

2009-11-05T23:53:00.000-08:00

Just a Simple login that uses Dictionary. Don't know if it work on a console. Plus i can't figure out a way to add something to the dictionary while the program is running.

database={'username': '1234', 'username2': '5678', 'username3': '9012'}
name = raw_input('Enter username: ')
ask = raw_input('Enter pin: ')
if ask in database[name]:
  print 'Welcome', name
else:
  print 'Invalid code'

you can try it's
Neoriz

Create Form C# for Newbie

2009-10-23T22:23:00.000-07:00

C# is the best, used very simple develop. You can try start with word "Hello World".
For Example :
first, you create project, in project display mainform. You create this form with Hello World C# Newbie with label in properties.

second, you create subform

good luck

Connecting Database

2009-07-06T20:56:00.000-07:00

Now Connecting database with sourceCode Java. You can connecting database use driver from database as pasckage in library on this Java. The Driver connection get from vendor database such as Oracle, mySql and SqlSever etc.

you can code java such as :

This file save with name ConnectionDatabase.java

package myPackage;

import java.io.*;
import java.sql.*;

interface InterfaceDatabase {
public void connectDatabase(String username, String password,
String oracleSID);
}

public class ConnectionDatabase implements InterfaceDatabase {
private String url;
public Connection conn;
public PreparedStatement pstm;

//Override from InterfaceDatabase
public void connectDatabase(String username, String password,
String DatabaseSID) {
try {
DriverManager.registerDriver(new driverDatabase..);
url = "String connection driver";
conn = DriverManager.getConnection(url, username, password);
} catch (SQLException ex) {
ex.printStackTrace();
if (conn != null) {
try {
conn.rollback();
} catch (SQLException el) {
el.printStackTrace();
}
}
}
}

public void disconnect() {
try {
pstm.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}

public void setQuery(String vsql) throws SQLException {
pstm = conn.prepareStatement(vsql);
}
}

call on file with file ConnUser.java

package myPackage;

import java.io.*;
import java.sql.*;

public class ConnUser {

public static void connUser(ConnectionDatabase cd,String vsql)throws Exception{
cd.connectDatabase("username", "password", "database");
cd.setQuery(vsql);
ResultSet rs=cd.pstm.executeQuery();
while(rs.next()){
System.out.println(rs.getInt(index)+" - "+rs.getString(index));
}
cd.disconnect();
}

public static void main (String[]args) throws Exception{
ConnectionDatabase db=new ConnectionDatabase();
connUser(db,"Query Database");

}
}

good luck to try it

Loading and Saving Image with the Image I/O Library

2009-06-19T02:59:00.000-07:00

Introduced in J2SE 1.4, the javax.imageio package is the primary package for the Java Image I/O API. As its name implies, this package helps you read and write image files. You might wonder what's so important about this package. The fact is that you could read images with the getImage method of various classes like Toolkit and Applet since the initial release of the Java platform. But there is more to the javax.imageio package than simply reading images. One important point is that there was no writeImage or putImage previous to the Image I/O library. Now there is a way to write images. Also, you can now set properties such as compression level when you save images.

The first question many people ask when working with the Image I/O libraries is what formats are supported? With Sun's reference implementation, you get a specific set. However, the API is flexible enough so that you can install your own formats by extending the necessary classes in the javax.imageio.spi library. For the moment, let's put that aspect of the library aside. To discover the installed set of readers and writers, you simply ask the ImageIO class through its getReaderFormatNames() and getWriterFormatNames() methods (or getReaderMIMETypes() and getWriterMIMETypes() if you want to work directly with MIME types). Here's an example:

// show image and saving image with difference extension file or name file
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;
import java.awt.*;
import javax.swing.*;

public class Demo {
private static class FrameShower implements Runnable {
final Frame frame;

public FrameShower(Frame frame) {
this.frame = frame;
}

public void run() {
frame.show();
}
}

public static void main(String args[]) throws IOException {

// Read
//File file = new File(args[0]);
File file = new File("e:/campuran/ada/nyoba.jpg"); //path file
BufferedImage input = ImageIO.read(file);
File outputFile = new File("e:/campuran/ada/image.png"); //path file
ImageIO.write(input, "PNG", outputFile);
// Convert ukuran
Kernel sharpKernel = new Kernel(3, 3, new float[] { 0.0f, -1.0f, 0.0f,
-1.0f, 5.0f, -1.0f, 0.0f, -1.0f, 0.0f });
ConvolveOp convolveOp = new ConvolveOp(sharpKernel,
ConvolveOp.EDGE_NO_OP, null);
int width = input.getWidth();
int height = input.getHeight();
BufferedImage output = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
convolveOp.filter(input, output);
// membuat tampilan
Icon icon = new ImageIcon(output);
JLabel label = new JLabel(icon);
JFrame frame = new JFrame("Gambare");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(label, BorderLayout.CENTER);
frame.pack();
// show image
Runnable runner = new FrameShower(frame);
EventQueue.invokeLater(runner);
}
}

You can check list from IO library javax.imageio.spi with :


import javax.imageio.*;

     public class GetList {
       public static void main(String args[]) {
         String readerNames[] = 
           ImageIO.getReaderFormatNames();
         printlist(readerNames, "Reader names:");
         String readerMimes[] = 
           ImageIO.getReaderMIMETypes();
         printlist(readerMimes, "Reader MIME types:");
         String writerNames[] = 
           ImageIO.getWriterFormatNames();
         printlist(writerNames, "Writer names:");
         String writerMimes[] = 
           ImageIO.getWriterMIMETypes();
         printlist(writerMimes, "Writer MIME types:");
       }
       private static void printlist(String names[], 
                                        String title) {
         System.out.println(title);
         for (int i=0, n=names.length; i < n; i++) {
           System.out.println("\t" + names[i]);
         }
       }
     }

good luck to try

Using Connection cx_Oracle to Oracle in Python

2009-05-13T21:39:00.001-07:00

For Connection python to Oracle use cx_Oracle. cx Oracle is a Python extension module thats allows access to Oracle Databases and conforms to the Python Database API specification. This module is currently built against Oracle 9.2.0, 10.2.0 and 11.1.0.

The interface specification consists of several sections:

Module Interface
Connection Objects
Cursor Object
Type Object and Constructors
Implementattion Hints for Module Authors
Optional DB API Extensions
Optional Error Handling Extensions
Optional Two-Phase Commit Extensions
Frequently Asked Questions
Major Changes from version 1.0 to Version 2.0
Open Issues
Footnotes
Unknowledgements

This information can look here.
for Excample use cx_Oracle :

import sys, cx_Oracle
connect=cx_Oracle.Connection("system/password@Server_database")
cursor=connect.cursor()
cursor.execute("PL/SQL or Query language")
data=cursor.fetchall()
data in method list, but can for print such as looping
for (list fields) in data:
print list fields

good luck,.......

Python is powerful, simple and fast

2009-03-02T18:08:00.000-08:00

You can exercise python,...
first you can text mode in window/Python Interactive Shell or PythonW in Edior, you write :

print "Hello word Neoriz"
result >> Hello word Neoriz

Using the Python Interpreter

Invoking the Interpreter

The Python interpreter is usually installed as /usr/local/bin/python on those machines where it is available; putting /usr/local/bin in your Unix shell's search path makes it possible to start it by typing the command

python

to the shell. Since the choice of the directory where the interpreter lives is an installation option, other places are possible; check with your local Python guru or system administrator. (E.g., /usr/local/python is a popular alternative location.)

On Windows machines, the Python installation is usually placed in C:\Python25, though you can change this when you're running the installer. To add this directory to your path, you can type the following command into the command prompt in a DOS box:

set path=%path%;C:\python25

Typing an end-of-file character (Control-D on Unix, Control-Z on Windows) at the primary prompt causes the interpreter to exit with a zero exit status. If that doesn't work, you can exit the interpreter by typing the following commands: "import sys; sys.exit()".

The interpreter's line-editing features usually aren't very sophisticated. On Unix, whoever installed the interpreter may have enabled support for the GNU readline library, which adds more elaborate interactive editing and history features. Perhaps the quickest check to see whether command line editing is supported is typing Control-P to the first Python prompt you get. If it beeps, you have command line editing; see Appendix A for an introduction to the keys. If nothing appears to happen, or if P is echoed, command line editing isn't available; you'll only be able to use backspace to remove characters from the current line.

The interpreter operates somewhat like the Unix shell: when called with standard input connected to a tty device, it reads and executes commands interactively; when called with a file name argument or with a file as standard input, it reads and executes a script from that file.

A second way of starting the interpreter is "python -c command [arg] ...", which executes the statement(s) in command, analogous to the shell's -c option. Since Python statements often contain spaces or other characters that are special to the shell, it is best to quote command in its entirety with double quotes.

Some Python modules are also useful as scripts. These can be invoked using "python -m module [arg] ...", which executes the source file for module as if you had spelled out its full name on the command line.

Note that there is a difference between "python file" and "python ". In the latter case, input requests from the program, such as calls to input() and raw_input(), are satisfied from file. Since this file has already been read until the end by the parser before the program starts executing, the program will encounter end-of-file immediately. In the former case (which is usually what you want) they are satisfied from whatever file or device is connected to standard input of the Python interpreter.

When a script file is used, it is sometimes useful to be able to run the script and enter interactive mode afterwards. This can be done by passing -i before the script. (This does not work if the script is read from standard input, for the same reason as explained in the previous paragraph.)

Argument Passing

When known to the interpreter, the script name and additional arguments thereafter are passed to the script in the variable sys.argv, which is a list of strings. Its length is at least one; when no script and no arguments are given, sys.argv[0] is an empty string. When the script name is given as '-' (meaning standard input), sys.argv[0] is set to '-'. When -c command is used, sys.argv[0] is set to '-c'. When -m module is used, sys.argv[0] is set to the full name of the located module. Options found after -c command or -m module are not consumed by the Python interpreter's option processing but left in sys.argv for the command or module to handle.

Interactive Mode

When commands are read from a tty, the interpreter is said to be in interactive mode. In this mode it prompts for the next command with the primary prompt, usually three greater-than signs (">>> "); for continuation lines it prompts with the secondary prompt, by default three dots ("... "). The interpreter prints a welcome message stating its version number and a copyright notice before printing the first prompt:

python Python 1.5.2b2 (#1, Feb 28 1999, 00:02:06) [GCC 2.8.1] on sunos5 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>>

Continuation lines are needed when entering a multi-line construct. As an example, take a look at this if statement:

>>> the_world_is_flat = 1
>>> if the_world_is_flat:
... print "Be careful not to fall off!" ... Be careful not to fall off!

The Interpreter and Its Environment

Error Handling

When an error occurs, the interpreter prints an error message and a stack trace. In interactive mode, it then returns to the primary prompt; when input came from a file, it exits with a nonzero exit status after printing the stack trace. (Exceptions handled by an except clause in a try statement are not errors in this context.) Some errors are unconditionally fatal and cause an exit with a nonzero exit; this applies to internal inconsistencies and some cases of running out of memory. All error messages are written to the standard error stream; normal output from executed commands is written to standard output.

Typing the interrupt character (usually Control-C or DEL) to the primary or secondary prompt cancels the input and returns to the primary prompt.2.1Typing an interrupt while a command is executing raises the KeyboardInterrupt exception, which may be handled by a try statement.

Executable Python Scripts

On BSD'ish Unix systems, Python scripts can be made directly executable, like shell scripts, by putting the line

#! /usr/bin/env python

(assuming that the interpreter is on the user's PATH) at the beginning of the script and giving the file an executable mode. The "#!" must be the first two characters of the file. On some platforms, this first line must end with a Unix-style line ending ("\n"), not a Mac OS ("\r") or Windows ("\r\n") line ending. Note that the hash, or pound, character, "#", is used to start a comment in Python.

The script can be given an executable mode, or permission, using the chmod command:

$ chmod +x myscript.py

Source Code Encoding

It is possible to use encodings different than ASCII in Python source files. The best way to do it is to put one more special comment line right after the #! line to define the source file encoding:

# -*- coding: encoding -*-

With that declaration, all characters in the source file will be treated as having the encoding encoding, and it will be possible to directly write Unicode string literals in the selected encoding. The list of possible encodings can be found in the Python Library Reference, in the section on codecs.

For example, to write Unicode literals including the Euro currency symbol, the ISO-8859-15 encoding can be used, with the Euro symbol having the ordinal value 164. This script will print the value 8364 (the Unicode codepoint corresponding to the Euro symbol) and then exit:

# -*- coding: iso-8859-15 -*-

currency = u"€"
print ord(currency)

If your editor supports saving files as UTF-8 with a UTF-8 byte order mark (aka BOM), you can use that instead of an encoding declaration. IDLE supports this capability if Options/General/Default Source Encoding/UTF-8 is set. Notice that this signature is not understood in older Python releases (2.2 and earlier), and also not understood by the operating system for script files with #! lines (only used on Unix systems).

By using UTF-8 (either through the signature or an encoding declaration), characters of most languages in the world can be used simultaneously in string literals and comments. Using non-ASCII characters in identifiers is not supported. To display all these characters properly, your editor must recognize that the file is UTF-8, and it must use a font that supports all the characters in the file.

The Interactive Startup File

When you use Python interactively, it is frequently handy to have some standard commands executed every time the interpreter is started. You can do this by setting an environment variable named PYTHONSTARTUP to the name of a file containing your start-up commands. This is similar to the .profile feature of the Unix shells.

This file is only read in interactive sessions, not when Python reads commands from a script, and not when /dev/tty is given as the explicit source of commands (which otherwise behaves like an interactive session). It is executed in the same namespace where interactive commands are executed, so that objects that it defines or imports can be used without qualification in the interactive session. You can also change the prompts sys.ps1 and sys.ps2 in this file.

If you want to read an additional start-up file from the current directory, you can program this in the global start-up file using code like "if os.path.isfile('.pythonrc.py'): execfile('.pythonrc.py')". If you want to use the startup file in a script, you must do this explicitly in the script:

import os
filename = os.environ.get('PYTHONSTARTUP')
if filename and os.path.isfile(filename):
execfile(filename)

Python

2009-03-02T01:58:00.000-08:00

Python is a dynamic object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of higher quality, more maintainable code.

Python runs on Windows, Linux/Unix, Mac OS X, OS/2, Amiga, Palm Handhelds, and Nokia mobile phones. Python has also been ported to the Java and .NET virtual machines.

Python is distributed under an OSI-approved open source license that makes it free to use, even for commercial products.

The Python Software Foundation (PSF) holds and protects the intellectual property rights behind Python, underwrites the PyCon conference, and funds grants and other projects in the Python community.

You can download ActivePython here, it's connect with database to use ODBC or cx_Oracle if connected with Oracle can run on window difference with Python.org, If you use python.org download here.

Python is OSI Certified Open Source

About Python

Python is a remarkably powerful dynamic programming language that is used in a wide variety of application domains. Python is often compared to Tcl, Perl, Ruby, Scheme or Java. Some of its key distinguishing features include:

very clear, readable syntax
strong introspection capabilities
intuitive object orientation
natural expression of procedural code
full modularity, supporting hierarchical packages
exception-based error handling
very high level dynamic data types
extensive standard libraries and third party modules for virtually every task
extensions and modules easily written in C, C++ (or Java for Jython, or .NET languages for IronPython)
embeddable within applications as a scripting interface

Python is powerful... and fast

Fans of Python use the phrase "batteries included" to describe the standard library, which covers everything from asynchronous processing to zip files. The language itself is a flexible powerhouse that can handle practically any problem domain. Build your own web server in three lines of code. Build flexible data-driven code using Python's powerful and dynamic introspection capabilities and advanced language features such as meta-classes, duck typing and decorators.

Python lets you write the code you need, quickly. And, thanks to a highly optimized byte compiler and support libraries, Python code runs more than fast enough for most applications.

Python plays well with others

Python can integrate with COM, .NET, and CORBA objects.

For Java libraries, use Jython, an implementation of Python for the Java Virtual Machine.

For .NET, try IronPython , Microsoft's new implementation of Python for .NET, or Python for .NET.

Python is also supported for the Internet Communications Engine (ICE) and many other integration technologies.

If you find something that Python cannot do, or if you need the performance advantage of low-level code, you can write extension modules in C or C++, or wrap existing code with SWIG or Boost.Python. Wrapped modules appear to your program exactly like native Python code. That's language integration made easy. You can also go the opposite route and embed Python in your own application, providing your users with a language they'll enjoy using.

Python runs everywhere

Python is available for all major operating systems: Windows, Linux/Unix, OS/2, Mac, Amiga, among others. There are even versions that run on .NET, the Java virtual machine, and Nokia Series 60 cell phones. You'll be pleased to know that the same source code will run unchanged across all implementations.

Your favorite system isn't listed here? It may still support Python if there's a C compiler for it. Ask around on news:comp.lang.python - or just try compiling Python yourself.

Python is friendly... and easy to learn

The Python newsgroup is known as one of the friendliest around. The avid developer and user community maintains a wiki, hosts international and local conferences, runs development sprints, and contributes to online code repositories.

Python also comes with complete documentation, both integrated into the language and as separate web pages. Online tutorials target both the seasoned programmer and the newcomer. All are designed to make you productive quickly. The availability of first-rate books completes the learning package.

Python is Open

The Python implementation is under an open source license that makes it freely usable and distributable, even for commercial use. The Python license is administered by the Python Software Foundation.

Try GUI on Java (Eclipse)

2009-02-05T19:23:00.000-08:00

For working Java GUI with Eclipse use Jigloo, you can downloading path Jigloo in website that eclipse. So you can install Jilgoo on Eclipse with open your Eclipse, at help menubar,. choosy submenu Software Updates -> Find and Install,.. look at this picture :

Click Search for new feature to install, if you first install on Eclipse. Click next

Click New local Site,.. your cursor at folder where your Jigloo save

After your Eclipse install, can use Eclipse to develop Java GUI. Create Project Java in Eclipse with right click -> new Java Project. In Folder scr make package with name myPakcage, so right click your mouse select new -> other -> GUI Form choosy Swing -> JFrame.

run class with ctrl+F11
good luck.. Neoriz

Skill wajib dimiliki Web Developer

2009-01-28T19:05:00.000-08:00

Karir Web Developer, sekarang udah bisa jadi pegangan hidup dan kesuksesan buat programmer, semakin beralihnya software dari desktop ke web membuat programmer mesti siap mempelajari ilmu-ilmu yang wajib dimiliki buat web developer untuk berhasil.

Dengan menguasai sederetan keahlian wajib ini, seorang web developer bakal punya masa depan cerah baik sebagai karyawan maupun entrepreneur, di dalam maupun di luar negeri.

1. Programming Basic

Ya iyalah udah pasti mesti menguasai pemrograman, programmer web atau desktop harus menguasai minimal 1 bahasa pemrograman. Untuk Web developer bisa memilih salah satu atau lebih ilmu komputer pemrograman diantaranya: PHP, JSP, ASP.NET, Ruby, Perl.

Pada dasarnya bahasa pemrograman mempunyai konsep yang sama namun perbedaan syntax (tata bahasa), jadi fokuslah pada 1 bahasa dan bila udah mantap lebih mudah mempelajari bahasa lainnya. Jangan baru ngerti PHP 10% udah belajar JSP, JSP baru 20% trus pindah ke Ruby.

2. Kuasai Framework

Sekarang ini membangun sebuah aplikasi web bukan berarti butuh waktu berbulan atau tahunan, berkat adanya Framework maka proses pembuatan aplikasi web bisa dipangkas hingga 75%. Framework membantu developer mengembangkan aplikasi dengan menggunakan bantuan library dan tools yang telah ada, sehingga proses yang standar dalam sebuah aplikasi nggak perlu dibuat dari nol.

Ada banyak nama Framework saat ini, diantaranya CakePHP, CodeIgniter, Prado, Django, Symfony, Ruby On Rails dll.

3. CMS Knowledge

CMS sudah menjadi pilihan utama web developer saat membangun sebuah situs, selain lebih cepat dalam pembuatan juga fitur2 yang dimiliki CMS sudah sangat lengkap untuk menjadikan sebuah situs tampil professional, belum lagi kemudahan user dalam mengatur kontent-nya.

Saat ini sangat banyak CMS OpenSource yang beredar, diantaranya Joomla, Drupal, Wordpress dll.

Keahlian mengenai CMS ini yang patut dikuasai adalah:

- Penggunaan sebagai user (Harus menguasai manajemen konten, struktur posting, user management, manajemen dokumen)

-Custom Setting, mulai dari pengaturan module, instalasi dan konfigurasi di server.

-Template Management, pengaturan dan modifikasi template

-Plugins/Extension Development, mempelajari cara pembuatan extension dari CMS

Banyak yang terjebak untuk mencoba semua CMS yang ada, nggak salah sih tapi jumlah CMS bisa sampai ratusan, bisa habis waktu untuk mengutak-atik satu persatu. Lebih baik fokus di satu CMS kemudian ahli di ke 4 bidang diatas. Bila sudah menguasai, silakan deh pindah ke CMS yang lain kalau mau.

4. Javascript Framework

Walaupun semakin banyak pemain yang bersaing dengan Javascript, tapi tetap saja penggunaannya semakin luas digunakan di internet, jadi menguasai framework javascript sangat penting bagi web developer, selain untuk menambah keindahan dan expressifnya situs juga menambah kemampuan dan user experience makin tambah puas.

Diantara framework javascript itu adalah: JQuery, Mootools, Dojo, Scriptaculous dll.

5. E-Commerce Knowledge

Semakin besar peluang perdagangan online dalam beberapa tahun terakhir dan juga kedepannya. Itu artinya bakal banyak order datang untuk pemesanan situs ecommerce, selain menguasai CMS ecommerce, developer juga mesti mempelajari payment gateway dan integrasinya.

6. Widget Development

Widget semakin sering dibuat oleh perusahaan untuk menjangkau visitornya dari situs lain, ini wajar dengan semakin bertambahnya jumlah website di internet, sehingga perusahaan harus bisa berhubungan dengan pelanggannya.

Pengembangan widget juga membutuhkan developer yang menguasai Javascript atau ActionScriptnya Flash.

7. Rich Internet Application

Nantinya aplikasi internet akan semakin berkembang dan semakin kaya fitur, itu sebabnya platform yang bisa menghasilkan aplikasi tersebut semakin bermunculan, menguasai salah satu dari platform RIA ini bakal jadi nilai plus developer di masa mendatang.

Diantara platform RIA adalah: Adobe AIR, JavaFX, OpenLaszlo, Silverlight dan tentu saja sang penguasa saat ini: Ajax.

8. Mobile Platform

Para pengunjung internet bukan hanya berasal dari pengguna desktop ataupun laptop tapi sudah jadi makanan harian pengguna Smartphone, iPhone, Blackberry dan nantinya Android serta dipastikan bakal terus bertambah pemain baru lainnya.

Untuk itu menguasai pemrograman dengan platform untuk mobile juga bakal semakin penting, diantaranya Java, .Net atau python.

9. SQL

Programmer web juga sangat penting menguasai bahasa SQL karena inilah bahasa yang digunakan untuk berkomunikasi dengan database, tanpa menguasai SQL akan sulit bagi web developer untuk mengatur manajemen informasi dari aplikasi yang dibuatnya.

Pada dasarnya, SQL yang digunakan untuk MySQL, Oracle, MS-SQL Server adalah sama, untuk itu perlu pengetahuan tambahan untuk koneksi dari aplikasi web ke databasenya.

10. HTML & CSS

Ini jelas wajib dikuasai, tanpa menguasai ini bisa-bisa programmer web mengalami pusing yang gak jelas, tapi dengan semakin berkembangya IDE (Integrated Development Environment) pekerjaan programmer untuk menguasai HTML dan CSS bisa lebih mudah, untuk CSS juga telah semakin banyak framework yang bisa digunakan.

Diantara IDE dan framework yang populer adalah Dreamweaver, Aptana, Amaya, Blueprint CSS, Eclipse & Netbeans dll.

Newbie Java

2009-01-21T00:36:00.000-08:00

The Java language, and the object-oriented model are pretty cool. Object-oriented programming has proven it's advantages time and again compared to procedural coding. But one place where the object-oriented syntax seems wasteful is in a simple example like this program. Using Java, five lines of code are required for the "Hello, world!" example, where the same thing can be achieved with a one-line batch file in DOS or Unix.

Fear not, though. Although this example makes Java look bad, in the real world most programs are not simple examples like this, and the elegance of the object-oriented model soon becomes apparent.

In this example we've created a class named HelloWorld. In Java, everything must be defined inside of a class, and since this program is about printing the string "Hello, world!", this seemed like as good a name as any for the class.

Inside of a standalone program like this the function named main is where all activity begins. This is similar to the C language. The only activity of this program is to print the string "Hello, world", so we do this using Java's System.out.println function. The printlnfunction prints our string to the standard output.

To run this program, save it in a file with the name HelloWorld.java. Important note - the file name must match the name of the class, so if you used a name besides HelloWorld for your class, make sure you use the same name for your file. Then, assuming you have the Java JDK loaded, compile the program with this command:

javac HelloWorld.java

When you compile the program you'll create a byte-code file named HelloWorld.class. You can confirm this with the ls command in Unix, or the dir command in the DOS/Windows world. Now you can execute the byte code in the Java interpreter with this command:

java HelloWorld

When you run the program at the command line, you'll see this output
Hello, world!

Conclusion

Well, that seemed like more work than necessary for a simple example. Although it may seem like overkill right now - relax - the extra syntax required by Java in this example is not the norm for larger programs, and eventually defining classes will seem like the really natural way to program.

Cara membuta path in java
Lokasi instalasi Java SDK ini biasanya disebut dengan JAVA_HOME, misalnya di C:\Program Files\Java\jdk1.6.0, tergantung dari versi Java nya. Untuk memudahkan proses kompilasi dan eksekusi, lakukan setup environment variable seperti berikut (untuk windows):

Klik kanan di My Computer, pilih tab Advanced, klik tombol Environment Variables.
Di bagian System variables, klik New. Buat environment variable baru dengan nama JAVA_HOME dengan value lokasi instalasi Java SDK Anda (misal: C:\Program Files\Java\jdk1.6.0).

Edit variable PATH, kemudian tambahkan lokasi direktori bin dari dari instalasi Java. Misal instalasi Java nya ada di: C:\Program Files\Java\jdk1.6.0, maka tambahkan ;C:\Program Files\Java\jdk1.6.0\bin di belakang value yang sudah ada.

Kita akan mulai dengan membuat sesuatu yang sangat terkenal, aplikasi Hello World Java Neoriz, atau orang biasa menyebutnya Hello World application.

1. Buka notepad, ketik kode berikut. Ketik, bukan copy dan paste, please…

Buat File Java -> Hello.java
buat script :
public class Hello{
public static void main (String[] args){
System.out.println("Hello World Java Neoriz"); }
}

2. Kemudian and masuk ke DOS promt masuk ke folder yang anda create, setelah itu compile dengan perintah javac Hello.java kemudian anda jalankan java Hello, dan hasilnya seperti di bawah :

Selamat anda mencoba

Ada apa dengan C# (SharpDevelop)

2008-12-18T18:38:00.000-08:00

#develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects on Microsoft's .NET platform. Bahasa pemograman C# merupakan aplikasi open source yang dapat di download pada website .Net Microsoft. Atau kamu bisa download melalui website ini http://www.icsharpcode.net/OpenSource/SD/Download/ download SharpDevelop 3.0 untuk menginstalnya diperlukan frameworknya bisa di download di http://www.microsoft.com/downloads/details.aspx?FamilyId=F26B1AA4-741A-433A-9BE5-FA919850BDBF&displaylang=en untuk mendownload file dotNetFx35setup.exe itu diinstal secara OnLine ato download software offlinenya yaitu SDK nya. Setelah melakukan Instalasi lalu jalankan software tersebut dan mulailah coding untuk mencobanya, langsung saja berikut contoh script tanpa membuat aplikasi GUI tapi berupa consile dengan nama file coba_cs.cs

using System;

namespace coba_cs
{
class Program
{
public static void Main(string[] args)
{
Console.WriteLine("Hello World!");

// TODO: Implement Functionality Here

Console.Write("lumayan juga kaya Java ");
Console.ReadKey(true);
}
}
}

dan hasilnya :

Hello Word!
lumayan juga kaya Java