Python开发者必读：树莓派实战指南

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《树莓派Python程序员手册》(Raspberry Pi Cookbook for Python Programmers)是一本专为Python开发者设计的指南，针对的是这款小巧但功能强大的单板计算机——树莓派(Raspberry Pi)。这本书提供超过50个易于理解且量身定制的食谱，旨在帮助读者充分利用树莓派的潜力，并通过Python语言实现各种功能。作者Tim Cox以其丰富的经验和深入浅出的讲解，确保了读者能够在轻松愉快的学习过程中掌握相关技能。书中内容覆盖了广泛的领域，包括但不限于基础设置、硬件操作、系统管理、Python编程应用、网络连接、数据存储、图形用户界面开发、以及与物联网(IoT)的集成等。无论是初学者还是经验丰富的开发人员，都能在本书中找到适合自己水平的项目和教程，从而提升对树莓派的操控能力和创新思维。在版权方面，此书受2014年Packt Publishing出版的版权保护，所有内容未经出版商书面许可不得复制、存储或以任何形式传播。尽管作者和出版社已尽力确保信息的准确性，但书中提供的内容不附带任何明示或暗示的保修，也不承担因使用本书而产生的直接或间接损失的责任。作者利用恰当的商标用法，提供了关于书中提及的所有公司和产品的相关信息，但并不保证这些信息的准确性。《树莓派Python程序员手册》是一本实用且权威的资源，对于希望在树莓派平台上运用Python进行创新和实验的读者来说，它是一份不可多得的参考资料。通过阅读这本书，读者不仅能掌握树莓派的基本操作，还能开启一个全新的技术探索之旅。

Preface

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Chapter 1

Why Python?

It is often asked, "Why has Python been selected as the language to use on the Raspberry

Pi?". The fact is that Python is just one of the many programming languages that can be used

on the Raspberry Pi.

There are many programming languages that you can choose, from high-level graphical block

programming, such as Scratch, to traditional C, right down to BASIC, and even raw Machine

Code Assembler. A good programmer often has to be code multilingual to be able to play

to the strengths and weaknesses of each language in order to best meet the needs of their

desired application. It is useful to understand how different languages (and programming

techniques) try to overcome the challenge of converting "what you want" into "what you get"

as this is what you are trying to do as well while you program.

Python has been selected as a good place to start when learning about programming by

providing a rich set of coding tools while still allowing simple programs to be written without

fuss. This allows beginners to gradually be introduced to the concepts and methods on which

modern programming languages are based without requiring them to know it all from the

start. It is very modular with lots of additional libraries that can be imported to quickly extend

the functionality. You will nd that over time, this encourages you to do the same, and you will

want to create your own modules that you can plug in to your own programs, thus taking your

rst steps into structured programming.

Like all programming languages, Python isn't perfect; things such as adding a space at the

start of a line will often break your code (indents matter a lot in Python; they dene how

blocks of code are grouped together). Generally, Python is slow; since it is interpreted, it

takes time to create a module while it is running the program. This can be a problem if you

need to respond to time critical events. However, you can precompile Python or use modules

written in other languages to overcome this. It hides the detail; this is both an advantage and

disadvantage. It is excellent for beginners but can be difcult when you have to second-guess

aspects such as data-types, but this in turn forces you to consider all the possibilities, which

can be a good thing.

Python 2 and Python 3

A massive source of confusion for beginners is that there are two versions of Python on the

Raspberry Pi (Version 2.7 and Version 3.2), which are not compatible with one another, so

code written for Python 2.7 may not run with Python 3.2 (and vice versa).

The Python Software Foundation is continuously working to improve and move forward

with the language, which sometimes means they have to sacrice backward compatibility in

order to embrace new improvements (and importantly, remove redundant and legacy ways

of doing things).

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