Recent Notes
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Created by jk34 on April 19, 2011 15:42:24
Last update: April 19, 2011 15:42:24
Check the __name__ variable to see if the Python module was invoked from the command line. The line prints when the Python script is called from the command line, but doesn't print when it is imported by another Python module with import MyModule .
if __name__ == '__main__':
print 'Invoked f...
Created by Dr. Xi on October 16, 2008 20:45:40
Last update: March 28, 2011 20:23:22
Java's built-in classes are way too complex/flexible for a simple protocol like HTTP. This is a wrapper to simplify HTTP GET and POST.
import java.io.*;
import java.net.*;
imp...
A simple test:
import java.io.*;
import java.util.*;
...
Created by Dr. Xi on February 09, 2011 13:27:51
Last update: February 09, 2011 13:27:51
By the perldoc ,
use Module LIST;
is exactly equivalent to:
BEGIN { require Module; Module->import( LIST); }
Because of the BEGIN block, use is executed immediately. Therefore, it is not suitable for lazy loading of modules at runtime.
use does not work with a runtime variable:
C:\>perl
$cgi = "CGI";
require $cgi;
prin...
require works:
C:\>perl
$cgi = 'CGI';
require "${cgi}.pm";
...
Also, file extension is required if require is not passed a bareword:
// this works
require CGI;
// so does th...
Created by Dr. Xi on August 30, 2010 18:17:15
Last update: August 30, 2010 18:19:49
Use the codecs module to read file in Unicode. This is from the Python doc :
import codecs
f = codecs.open('unicode.rst', en...
I had some luck reading files mainly in ASCII but contained some binary data with:
import codecs
f = codecs.open('unicode.rst', en...
Created by Fang on April 01, 2010 22:24:58
Last update: April 02, 2010 02:49:38
In this note I'll show you how to create and package a JSP custom tag. The purpose of this tag is to display a random splash image for a home page, among a set of images. We should be able to add or delete candidate splash images from the WAR archive without the need to change the JSP. This is the intended use of the tag:
<%@ taglib uri="http://custom.tag.com/demo" prefix... In the above example you provide a set of images named splash*.png (e.g., splash1.png, spalsh2.png, ...), and the tag will pick a random one to display when the JSP is rendered. Let's get started. I'll use Maven for this purpose. Create the standard Maven directory structure ./pom.xml ./src ./src/main ./src/main/jav... pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0"... SplashTag.java package tagdemo; import java.util.ArrayList......
Created by Dr. Xi on January 08, 2010 03:53:37
Last update: January 08, 2010 03:54:56
This is an Ant custom task to merge Properties files I lifted from http://marc.info/?l=ant-user&m=106442688632164&w=2 , with some minor bug fixes.
Example usage:
<taskdef name="mergeProperty" classname="ant.task....
Implementation:
package ant.task.addon;
import java.io.Buff...
Created by Dr. Xi on October 06, 2008 18:55:52
Last update: April 18, 2009 19:46:24
Command line arguments are passed to the python program in sys.argv , which is just a list.
import sys
for arg in sys.argv:
prin...
Created by Dr. Xi on October 06, 2008 23:31:56
Last update: October 06, 2008 23:35:08
Use file.write instead of print .
Python 2.5.1 (r251:54863, Mar 7 2008, 04:10:12)
...
