Jython Essentials

Jython is an implementation of the Python programming language written in Java, allowing Python programs to integrate seamlessly with any Java code. The secret to Jython's popularity lies in the combination of Java's libraries and tools with Python's rapid development capabilities. Jython Essentials provides a solid introduction to the language, numerous examples of Jython/Java interaction, and valuable reference material on modules and libraries of use to Jython programmers.

Samuele Pedroni is one of the main Jython developers. He holds a CS flavored diploma in mathematics from the ETH Zurich (Swiss institute of technology in Zurich). He is now a teacher and research assistant at the Institute of Theoretical CS. He plans to come to the US for a PhD in the field of dynamic languages and dynamic compilation. He came to Jython with the interest in improving it with respect to Java importing and reloading. He has developed several important patches related to java integration, classloaders, and the reworking of java/python importing rules and design.

Noel Rappin has a Ph.D. in computer science from the Georgia Institute of Technology, where his research included methods for teaching Object-Oriented Programming and Design. He has extensive production experience in both Java and Python. Noel also contributed an introductory chapter to the book Squeak: Open Personal Computing and Multimedia (PH).

Foreword

ix

Preface

xiii

Introduction to Jython

1

(15)

Jython Requirements

1

(1)

Welcome to Jython

2

(5)

What's Jython Good For?

7

(2)

The Benefits of Jython

9

(4)

The Speed Question

13

(1)

The Rest of the Book

14

(2)

Jython Basics

16

(30)

Running Jython

16

(2)

Basic Types

18

(2)

Operators

20

(2)

Numeric Types

22

(3)

Sequences: Lists and Tuples

25

(8)

Strings

33

(7)

Mappings and Dictionaries

40

(4)

Jython Files

44

(2)

Jython Control Flow

46

(20)

Statements and Expressions

46

(1)

Assignment

47

(4)

Printing

51

(1)

Blocks

52

(2)

Conditional Logic

54

(2)

Loops

56

(2)

List Comprehensions

58

(3)

Exceptions

61

(2)

Evaluating Code Dynamically

63

(3)

Modules and Functions

66

(17)

Modules

66

(2)

Functions

68

(1)

Parameter Passing with Style

69

(8)

Import Statements and Packages

77

(6)

Object-Oriented Jython

83

(21)

Creating Classes

83

(2)

Methods

85

(4)

Classes, Instances, and Access Control

89

(7)

Inheritance

96

(2)

Special Methods

98

(6)

Using Java from Jython

104

(16)

Basic Object Usage

104

(3)

Automatic Type Conversion

107

(5)

Java Arrays and the jarray Module

112

(3)

Java-co-Python Types: Automatic Conversion

115

(2)

Collection Wrappers

117

(1)

Avoiding Name Collisions

117

(3)

Inheriting from lava

120

(11)

Basic Mechanics

121

(2)

Java Interoperation and Overriding

123

(4)

Calling Super Methods and Constructors

127

(4)

Reflection and JavaBeans

131

(13)

Bean-Based Reflection

132

(6)

Python-Based Reflection

138

(6)

Using Swing

144

(17)

Java Versus Jython

145

(4)

A Calculator

149

(3)

An HTML Browser

152

(3)

An HTML Source Browser

155

(6)

Using Java Libraries

161

(17)

JDBC and the Python Database API

161

(4)

Servlets and PyServlet

165

(5)

Jython and XML

170

(8)

Jython Standard Library

178

(25)

Using Python Modules

178

(1)

System and File Modules

179

(8)

Regular Expressions

187

(7)

Serialization and Pickling

194

(3)

Unit Testing with PyUnit

197

(6)

Embedding Jython Inside Java

203

(15)

Setting Up an Interpreter

204

(2)

Executing Code

206

(2)

Accessing the Interpreter Namespace

208

(1)

Using PyObjects

209

(2)

PyObject Subclasses

211

(3)

Catching Exceptions

214

(1)

Embedding Examples

214

(4)

Compiling Jython

218

(13)

Why Compile?

218

(2)

The Compiler in Action

220

(4)

Packaging in Java Archives

224

(1)

Using Jython in Java

225

(4)

A Simple Applet

229

(2)

A. Installing Jython

231

(3)

B. Jython Options and Registry

234

(6)

C. Jython Exceptions

240

(4)

D. Jython and CPython Differences

244

(6)

E. Java-to-Python Quick Reference

250

(7)

Index

257

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Summary

Author Biography

Table of Contents

Supplemental Materials