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<HTML><HEAD><TITLE>Preface</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.72"><LINKREL="HOME"TITLE="GUI Programming with Python: QT Edition"HREF="book1.htm"><LINKREL="PREVIOUS"TITLE="GUI Programming with Python: QT Edition"HREF="book1.htm"><LINKREL="NEXT"TITLE="For whom is this book intended"HREF="x43.htm"></HEAD><BODYCLASS="PREFACE"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">GUI Programming with Python: QT Edition</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="book1.htm"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="x43.htm"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="PREFACE"><H1><ANAME="PREFACE">Preface</A></H1><DIVCLASS="TOC"><DL><DT><B>Table of Contents</B></DT><DT><AHREF="f26.htm#PREFACEUSINGPYQT">Who is using PyQt</A></DT><DT><AHREF="x43.htm">For whom is this book intended</A></DT><DT><AHREF="x52.htm">How to read this book</A></DT><DT><AHREF="x61.htm">Conventions</A></DT><DT><AHREF="x76.htm">Acknowledgments</A></DT></DL></DIV><P>The main topic of this book is application development using PyQt, a library extension to the Python programming language — a library that is meant to form the basis for GUI programming. PyQt is free software, but there is also a commercial IDE available, BlackAdder, that is specially written to assist working with PyQt. I will show you the ins and outs of PyQt by developing a complete and complex application.</P><P>Like most thirty–somethings who started programming in their teens, I've worked with a lot of different technologies. I started with Sinclair Basic, going on to Turbo Pascal and SNOBOL — I have developed for Windows in pure C, with Borland Pascal and with Visual Basic. I've done my stretch with Oracle Forms, and served as a Java developer. On Linux, I've wet my feet with Free Pascal, with C++, using XForms and Qt. And just when I was getting fond of Qt and C++, I found out about Python — a few years ago now. I found programming with PyQt to be a lot more fun than anything else, and productive fun, too.</P><P>For sheer productivity, nothing beats Python and PyQt. And while there's always something new to learn or explore in Python, if you're in the mood, it's easy and pleasant to write useful applications from the first day. No other programming language or library has ever given me that.</P><P>So, when Cameron Laird, during a discussion on the comp.lang.python newsgroup suggested that I'd write a book on this particular way of developing GUI applications with Python, I started to think — and more than think. I started to contact publishers, until one day Shawn Gordon of TheKompany brought me into contact with Joshua Drake of Opendocs. I started writing text and code almost immediately.</P><P>Joshua's patience has been monumental — I should have written this book between February and May, but it took me until November. All I can say for myself is that a lot of effort has gone into the book. I discuss most of the concepts and classes of the Qt library, which might be useful not only to Python developers, but also to C++ developers, and I have written a <SPAN><ICLASS="EMPHASIS">lot</I></SPAN> of example scripts.</P><P>Where Bruce Eckel (of <ICLASS="CITETITLE">Thinking in Java</I> fame) favors small example programs because they clearly illustrate the matter in hand, John Grayson in <ICLASS="CITETITLE">Python and Tkinter</I> argues that larger real-life applications are more useful because they don't hide the complexity that is a part of any programming effort.</P><P>Both are right, of course, so I decided to give you both small examples and one really large one. Part I and II of this book concern themselves with concepts: here the examples are small, often amounting to less than one page of code. Part III takes you through the development of a complete, complex application. In this case an editor, but one with a lot of extra features. I think it's a very good way of learning what developing complex applications entails - I spare you none of the nasty details that software development entails.</P><P>I have tried to keep to a very clear style of coding, with few or none of the clever hacks that are possible in Python — like adding the methods of one class to another, or creating lists of function objects. The purpose is to tell you about writing real applications using Python and Qt. Clever hacking has its place, but is best savored on its own.</P><P>The emphasis of the book is also firmly on application development, not on creating graphics per se — although several techniques are mentioned here and there that have to do with creating charts and graphs.</P><DIVCLASS="SECT1"><H1CLASS="SECT1"><ANAME="PREFACEUSINGPYQT">Who is using PyQt</A></H1><P>The combination of Python and Qt is extremely powerful, and is used in a wide variety of applications. People are scripting OpenGL applications with it, creating complex 3D models, animation applications, writing database applications, games, utilities and hardware monitoring applications. It is used in open source projects, but also by large companies, like Disney Television and Media. If you're not working on embedded software, hardware drivers or a new operating system, chances are that PyQt is the right choice for you, too.</P></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="book1.htm"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="book1.htm"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="x43.htm"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">GUI Programming with Python: QT Edition</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"> </TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">For whom is this book intended</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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