Lubanovic - Introducing Python: modern computing in simple packages
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- Book:Introducing Python: modern computing in simple packages
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Easy to understand and fun to read, this updated edition of Introducing Python is ideal for beginning programmers as well as those new to the language. Author Bill Lubanovic takes you from the basics to more involved and varied topics, mixing tutorials with cookbook-style code recipes to explain concepts in Python 3. End-of-chapter exercises help you practice what youve learned.
Youll gain a strong foundation in the language, including best practices for testing, debugging, code reuse, and other development tips. This book also shows you how to use Python for applications in business, science, and the arts, using various Python tools and open source packages.
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by Bill Lubanovic
Copyright 2020 Bill Lubanovic. All rights reserved.
Printed in the United States of America.
Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://oreilly.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .
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- Interior Designer: David Futato
- Cover Designer: Karen Montgomery
- Illustrator: Rebecca Demarest
- November 2019: Second Edition
- 2019-11-06: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781492051367 for release details.
The OReilly logo is a registered trademark of OReilly Media, Inc. Introducing Python, the cover image, and related trade dress are trademarks of OReilly Media, Inc.
The views expressed in this work are those of the author, and do not represent the publishers views. While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.
978-1-492-05136-7
[LSI]
With love to Mary, Tom & Roxie, and Karin & Erik
As the title promises,this book will introduce you toone of the worlds most popular programming languages: Python.Its aimed at beginning programmers as well as more experiencedprogrammers who want to add Python to the languagesthey already know.
In most cases,its easier to learn a computer languagethan a human language.Theres less ambiguityand fewer exceptions to keep in your head.Python is one of the most consistent and clear computer languages.It balancesease of learning,ease of use,and expressive power.
Computer languages are made ofdata (like nouns in spoken languages)and instructions or code (like verbs).You need both.In alternating chapters,youll be introduced to Pythonsbasic code and data structures,learn how to combine them,and build up to more advanced ones.The programs that you read and write will get longer and more complex.Using a woodworking analogy, well start with a hammer,nails, and scraps of wood.Over the first half of this book,well introduce more specialized components,up to the equivalents of lathes and other power tools.
Youll not only learn the language,but also what to do with it.Well begin with the Python language and itsbatteries included standard library,but Ill also show you how to find, download,install, and usesome good third-party packages.My emphasis is on whatever Ive actually found usefulin more than 10 years of production Python development,rather than fringe topics or complex hacks.
Although this is an introduction,some advanced topics are included becauseI want to expose them to you.Areas like databases and the web are still covered,but technology changes fast.A Python programmer might now be expected to know somethingabout cloud computing, machine learning,or event streaming.Youll find something here on all of these.
Python has some special features that work betterthan adapting styles from other languages that you may know.For example, using for and iterators isa more direct way of making a loop thanmanually incrementing some counter variable.
When youre learning something new,its hard to tell whichterms are specific instead of colloquial,and which concepts are actually important.In other words,Is this on the test?Ill highlight terms and ideas that havespecific meaning or importance in Python,but not too many at once.Real Python code is included early and often.
Ill include a note such as thiswhen something might be confusing, or if theresa more appropriate Pythonic way to do it.
Python isnt perfect.Ill show you things that seem odd or that should be avoidedand offer alternatives you can use, instead.
Now and then,my opinions on some subjects(such as object inheritance,or MVC and REST designs for the web)may vary a bit fromthe common wisdom.See what you think.
This book is for anybody interested in learningone of the worlds most popular computing languages,regardless of whether you have previously learned any programming.
Whats changed since the first edition?
About a hundred more pages, including cat pictures.
Twice the chapters, each shorter now.
An early chapter devoted to data types, variables, and names.
New standard Python features like f-strings.
New or improved third-party packages.
New code examples throughout.
An appendix on basic hardware and software, for new programmers.
An appendix on asyncio, for not-so-new programmers.
New stack coverage: containers, clouds, data science,and machine learning.
Hints on getting a job programming in Python.
What hasnt changed?Examples using bad poetry and ducks.These are evergreen.
(Chapters 1222) shows how Python is used in specific application areas such as the web, databases, networks, and so on; read these chapters in any order you like.
Heres a brief preview of the chapters and appendixes,including some of the terms that youll run into there:
Computer programs arenot that different from directions that you see every day.Some little Python programs give you a glimpseof the languages looks, capabilities,and uses in the real world.Youll see how to run a Python programwithin its interactive interpreter(or shell),or from a text file saved on your computer.
Computer languages mix data and instructions.Different types of dataare stored and treated differently by the computer.They may allow their values to bechanged (mutable)or not (immutable).In a Python program,data can be literal(numbers like 78,text strings like "waffle")or represented by named variables.Python treats variables like names,which is different from many other languagesand has some important consequences.
This chapter shows Pythons simplest data types:booleans, integers, and floating-point numbers.Youll also learn the basic math operations.The examples use Pythons interactive interpreterlike a calculator.
Well bounce between Pythons nouns (data types)and verbs (program structures) for a few chapters.Python code normally runs a line at a time,from the startto the end of a program.The if code structure lets you run different lines of code,depending on some data comparison.
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