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A Byte of PythonSwaroop C H
,A Byte of Python
Swaroop C H
Copyright © 2003-2005 Swaroop C H
Abstract
This book will help you to learn the Python programming language, whether you are new to computers
or are an experienced programmer.
This book is released under the Creative Commons Attribution-NonCommercial-ShareAlike License 2.0 .
,
, Table of Contents
Preface ...................................................................................................................... x
Who This Book Is For .......................................................................................... x
History Lesson ................................................................................................... x
Status of the book ................................................................................................ x
Official Website ................................................................................................. xi
License Terms ................................................................................................... xi
Feedback .......................................................................................................... xi
Something To Think About .................................................................................. xi
1. Introduction ............................................................................................................ 1
Introduction ....................................................................................................... 1
Features of Python .............................................................................................. 1
Summary ................................................................................................... 2
Why not Perl? .................................................................................................... 3
What Programmers Say ........................................................................................ 3
2. Installing Python ..................................................................................................... 4
For Linux/BSD users ........................................................................................... 4
For Windows Users ............................................................................................. 4
Summary ........................................................................................................... 5
3. First Steps .............................................................................................................. 6
Introduction ....................................................................................................... 6
Using the interpreter prompt .................................................................................. 6
Choosing an Editor .............................................................................................. 6
Using a Source File ............................................................................................. 7
Output ...................................................................................................... 7
How It Works ............................................................................................. 8
Executable Python programs ................................................................................. 8
Getting Help ...................................................................................................... 9
Summary ......................................................................................................... 10
4. The Basics ............................................................................................................ 11
Literal Constants ............................................................................................... 11
Numbers ......................................................................................................... 11
Strings ............................................................................................................ 11
Variables ......................................................................................................... 13
Identifier Naming .............................................................................................. 13
Data Types ...................................................................................................... 14
Objects ........................................................................................................... 14
Output .................................................................................................... 15
How It Works ........................................................................................... 15
Logical and Physical Lines ................................................................................. 15
Indentation ...................................................................................................... 17
Summary ......................................................................................................... 18
5. Operators and Expressions ....................................................................................... 19
Introduction ..................................................................................................... 19
Operators ......................................................................................................... 19
Operator Precedence .......................................................................................... 21
Order of Evaluation ................................................................................... 22
Associativity ............................................................................................ 22
Expressions ...................................................................................................... 22
Using Expressions ..................................................................................... 22
Summary ......................................................................................................... 23
6. Control Flow ........................................................................................................ 24
Introduction ..................................................................................................... 24
The if statement ................................................................................................ 24
iv
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