Python and Jython
Jython is an implementation of the Python scripting language, which is written in the Java language and integrated with the Java platform. Python is a powerful object-oriented scripting language.
Jython is useful because it provides the productivity features of a mature scripting language and, unlike Python, runs in any environment that supports a Java virtual machine (JVM). This means that the Java libraries on the JVM are available to use when you're writing programs. With Jython, you can take advantage of this difference, and use the syntax and most of the features of the Python language.
As a scripting language, Python (and its Jython implementation) is easy to learn and efficient to code, and has minimal required structure to create a running program. Code can be entered interactively, that is, one line at a time. Python is an interpreted scripting language; there is no precompile step, as there is in Java. Python programs are simply text files that are interpreted as they're input (after parsing for syntax errors). Simple expressions, like defined values, as well as more complex actions, such as function definitions, are immediately executed and available for use. Any changes that are made to the code can be tested quickly. Script interpretation does, however, have some disadvantages. For example, use of an undefined variable is not a compiler error, so it's detected only if (and when) the statement in which the variable is used is executed. In this case, you can edit and run the program to debug the error.
Python sees everything, including all data and code, as an object. You can, therefore, manipulate
these objects with lines of code. Some select types, such as numbers and strings, are more
conveniently considered as values, not objects; this is supported by Python. There is one null value
that's supported. This null value has the reserved name
For a more in-depth introduction to Python and Jython scripting, and for some example scripts, see http://www.ibm.com/developerworks/java/tutorials/j-jython1/j-jython1.html and http://www.ibm.com/developerworks/java/tutorials/j-jython2/j-jython2.html.