Swaroop.CH--A_byte_of_python_115.pdf

A Byte of Python – www.python.g2swaroop.net

A Byte of Python

Swaroop C H

www.python.g2swaroop.net

Version 1.15

This book is released under a Creative Commons License.

Revision History

Revision 1.15

28/03/2004

Minor revisions

Revision 1.12

16/03/2004

Additions and corrections

Revision 1.10

09/03/2004

More typo corrections, thanks to many enthusiastic and helpful readers.

Revision 1.00 08/03/2004 g2

After tremendous feedback and suggestions from readers, I have made significant

revisions to the content along with typo corrections.

Revision 0.99 22/02/2004 g2

Added a new chapter on modules and about variable number of arguments in functions.

Revision 0.98 16/02/2004 g2

Wrote a Python script and CSS stylesheet to improve XHTML output, including a crude

lexical analyzer for syntax highlighting of the programs.

Revision 0.97 13/02/2004 g2

Another completely rewritten draft, in DocBook XML (again). Book has improved a lot -

It is more coherent and readable.

Revision 0.93

25/01/2004

Added IDLE talk and more Windows-specific stuff

Revision 0.92

05/01/2004

Changes to some examples, other improvements

Revision 0.91

30/12/2003

Corrected some typos, improvised certain topics

Revision 0.90

18/12/2003

Added 2 more chapters, OpenOffice format with revisions

Revision 0.60

21/11/2003

A Byte of Python – www.python.g2swaroop.net

Fully Rewritten and Expanded

Revision 0.20

20/11/2003

Corrected some typos and errors

Revision 0.15

20/11/2003

Converted to DocBook XML

Revision 0.10

14/11/2003

Initial draft using KWord

Abstract

The Perfect Anti-Venom for your programming problems!

This book will help you learn to use the Python language, whether you are new to

computers or are an experienced programmer.

A Byte of Python – www.python.g2swaroop.net

Dedication

This book is dedicated to each and every person in the free and open source

software community. They work hard to create such wonderful software and

technologies and share it with others. They selflessly share their knowledge and

expertise with us. The efforts of all the programmers, designers, artists, documentation

writers, bug-fixers and of course, the users, in creating such software and technologies

is truly inspiring and amazing.

A Byte of Python – www.python.g2swaroop.net

Table of Contents

Preface

Who This Book Is For

History Lesson

Status of this Book

Official Website

License Terms

I'd Like To Hear From You

Something To Think About

1. Introduction

Introduction

Features of Python

Summary

Why not Perl?

What Programmers Say

2. Installing Python

For Linux/BSD Users

For Windows Users

Summary

3. First Steps

Introduction

Using The Interpreter Prompt

Choosing an Editor

Using A Source File

Using a Source File

Executable Python programs

Getting Help

Summary

4. The Basics

Literal Constants

Numbers

Strings

Variables

Identifier Naming

Data Types

Objects

Logical and Physical Lines

Indentation

Summary

5. Operators and Expressions

Introduction

Operators

Operator Precedence

A Byte of Python – www.python.g2swaroop.net

Order of Evaluation

Associativity

Expressions

Using Expressions

Summary

6. Control Flow

Introduction

The if statement

Using the if statement

The while statement

Using the while statement

The for loop

Using the for statement

The break statement

Using the break statement

The continue statement

Using the continue statement

Summary

7. Functions

Introduction

Defining a Function

Function Parameters

Using Function Parameters

Local Variables

Using Local Variables

Using the global statement

Default Argument Values

Using Default Argument Values

Keyword Arguments

Using Keyword Arguments

The return statement

Using the return statement

DocStrings

Using DocStrings

Summary

8. Modules

Introduction

Using the sys module

Byte-compiled .pyc files

The from..import statement

A module's __name__

Using a module's __name__

Making your own Modules

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