Jython-Introduction

Jython
Python for Java Platform

Agenda
❖ History
❖ Introduction
❖ Installation
❖ Jython Console
❖ Jython Basic Datatypes
❖ Collections
❖ Modules and Importing
❖ Functions

History
It was initially created in late 1997 to replace C with Java for performace
intensive.
It moves to SourceForge in October, 2000.
The Python Software Foundation awarded a grant in January 2005.
Jython 2.5 was released in June 2009

Introduction
● Python is an easy to learn, powerful programming language.
● Jython is an implementation of Python for the JVM.
● It takes the Python programming languages syntax and enables it to run
on the Java Platform.
● Most of the Python modules will run without changes under Jython, but if
they use extensions then they will probably not work.

Why Jython
1. Embedded Scripting
2. Ability to extend existing Java classes
3. Optional static compilation
4. Bean Properties
5. Python Language

There are certain libraries written in Java languages to be included with Jython
(especially modules written in C).
● Introduction
● Built-in Functions
● Built-in Constants
● Built-in Objects
● Built-in Types
● Built-in Exceptions
● String Services
● Data Types
● Numeric and Mathematical
Modules
● File and Directory Access
● Data Persistence
● Data Compression and
Archiving
● File Formats
● Cryptographic Services
● Generic Operating System
Service
● Optional Operating System
● Interprocess Communication
and Networking
● Many More...

Installation
Download Jython 2.7 and execute below command to start installation GUI.
java -jar jython_installer-2.*.*.jar
We can add --console to start the installation in non GUI.
JYTHON_HOME=/home/vijay/jython2.7.0; export JYTHON_HOME
PATH=$PATH:$JYTHON_HOME/bin

Jython Basic Data Type
● It sees everything, including all data and code, as an object.
● Jython Types Summary
● Common Operators
● Boolean Types
● Numeric Types
● Additional Methods and Operations

Jython Collections
It supports two major types of collections
1. Sequence Types (Order Collection of items)
2. Map Type

Sequence Types
1. All sequences are zero-indexed. It is similar to C and Java Arrays.
2. All sequences support indexing (or subscripting) to select sub-elements.
3. It support an extension of indexing, called slicing, which selects a range of
elements.
4. It also support reverse slicing.
5. Slicing Reference
6. Sequence Operators
7. Sequence Function

Strings
1. A string is an immutable sequence of characters treated as a value.
2. String Methods
3. It doesn’t have a character type. Character are represented by strings of
length one.
4. Escape Character
5. Format Code

Tuples
1. Tuples are immutable lists of any type.
2. It can be of any length and can contain any type of object.
3. Tuple Example

Ranges
1. Jython uses immutable sequence of increasing integers, called ranges.
2. It can be easily created by
a. range({start}, end,{inc}) creates a small range. All element of the range exist.
b. xrange({start}, end, {inc}) creates a large range. Elements are created only as needed.
3. Default start is 0 and default inc is 1.

Lists
1. Lists Method
2. We can use List as Stack and Queue.
3. Stack is easy to implement using append() and pop().
4. To implement Queue we use collections.queue
5. It can also be created via advance notation, called list comprehensions.

Map and Dictionaries
We work only with subtypes of Map. Most commonly we used dictionary.
Dictionary Example

Modules and Importing
● Jython breaks program down into separate files, called modules.
● Jython Modules Library
● A module is an executable Jython file that contains definitions.
● Jython packages are implemented as directories that can contain one or
more than one modules and a special file __init__.py, that executed before
first module of the package is executed.
● import module {as alias} OR from module import name {as alias}
● From module import *
● Import is executable

Other Important Stuff
Exception
Procedural Statement

Jython Functions
1. Functions
Blocks of code that return values (called functions)
2. Subroutines
Blocks that don’t return values
Functions are declared by def statement.
def name ( args ): statement -- or -- def name ( args ): block

● Specifying Function Argument
● Anonymous Function
● Generic Function
● Nested Function
● Functional Programming

References
● http://imagej.net/Jython_Scripting_Examples
● https://www.ibm.com/developerworks/java/tutorials/j-jython1/j-jython1.h
tml
● https://dzone.com/articles/embed-jython-to-your-java-codebase

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