piwenxu的博客

和 ms access 一样简单的数据库操作，但可以编译独立程序，不必依赖主程序，可以放在 USB 带在身上，随时都可以执行，所以比 ms access 更方便。数据库使用简便的 SQLite，相当稳定，速度也快，很适合中小型的数据库操作。这个程序带有补丁，是终身授权的。

很实用，pdf 转换到 Doc 可以保持 Pdf 原来的排版布局。 Convert PDF to Word, PowerPoint, Excel, Text, ePub, HTML and image file in batches Support OCR technology to increase the conversion effect Recognize multi-language PDF file Set the layout and text encoding of the output file and output image’s format, color, size,

超清晰的文字版（不是扫描版）。 If you want to learn how to program in Python, one of today’s most popular computer programming languages, PYTHON PROGRAMMING FOR TEENS is the perfect first step. Written by teacher, author, and Python expert Kenneth Lambert, this book will help you build a solid understanding of programming and prepare you to make the jump to other languages and more advanced instruction. In PYTHON PROGRAMMING FOR TEENS, you will learn problem solving, program development, the basics of using classes and object...

Written specifically for COM-based ADO developers retooling for ADO.NET using the C# language, this book brings fresh insights and tips on the ADO.NET technology. Veteran authors William Vaughn and Peter Blackburn have packed this formative guide with practical advice on how to write code that is both faster running and easier to understand. The onset of the new .NET technology is forcing developers to completely rethink their data access strategies. This book helps you to do this through working examples and numerous discussions of what works and what does'nt. Derived from years of experience working with data access developers, ADO.NET Examples and Best Practices for C# Programmers includes a set of techniques proven to drastically reduce overhead, problems, and confusion for the developer, the system, and the entire team. While some are quite simple to implement, others require considerable forethought to enable. This is a developers bookfull of hints, tips and notes passed on from those who've spent significant time in the .NET and C# trenches.

ADO.NET and ADO Examples and Best Practices for VB Programmers, Second Edition brings the popular first edition up to date with fresh insights and tips on COM-based ADOand adds a voluminous section on the new ADO.NET technology. Written specifically for COM-based ADO developers retooling for ADO.NET, this is a developer's book, packed with practical advice on how to make code run faster, yet be easier to write and understand.

本书从基本的概念开始，循序渐进地介绍高级的优化主题。首先介绍了Python的主流性能分析器，以及用于帮助理解性能分析结果的可视化工具。然后介绍了通用的性能优化方法和专门针对Python的性能优化方法，带你浏览该语言的主要结构，让你只需做一点改变，即可迅速改善代码的性能。最后介绍了一些专门用于数据处理的程序库，教你如何正确地使用它们以获得最佳性能。

本书对互联网基盘——HTTP协议进行了全面系统的介绍。作者由HTTP协议的发展历史娓娓道来，严谨细致地剖析了HTTP协议的结构，列举诸多常见通信场景及实战案例，最后延伸到Web安全、最新技术动向等方面。本书的特色为在讲解的同时，辅以大量生动形象的通信图例，更好地帮助读者深刻理解HTTP通信过程中客户端与服务器之间的交互情况。读者可通过本书快速了解并掌握HTTP协议的基础，前端工程师分析抓包数据，后端工程师实现REST API、实现自己的HTTP服务器等过程中所需的HTTP相关知识点本书均有介绍。 本书适合Web开发工程师，以及对HTTP协议感兴趣的各层次读者。

作者 Alejandro Rodas de Paz Joseph Howse Python Game Programming by Example enables readers to develop cool and popular games in Python without having in-depth programming knowledge of Python. The book includes seven hands-on projects developed with several well-known Python packages, as well as a comprehensive explanation about the theory and design of each game.

注：上次误将加密文档上传，抱歉！这次已解密了。 《像计算机科学家一样思考python》按照培养读者像计算机科学家一样的思维方式的思路来教授python语言编程。全书贯穿的主体是如何思考、设计、开发的方法，而具体的编程语言，只是提供一个具体场景方便介绍的媒介。《像计算机科学家一样思考python》并不是一本介绍语言的书，而是一本介绍编程思想的书。和其他编程设计语言书籍不同，它不拘泥于语言细节，而是尝试从初学者的角度出发，用生动的示例和丰富的练习来引导读者渐入佳境。 作者从最基本的编程概念开始讲起，包括语言的语法和语义，而且每个编程概念都有清晰的定义，引领读者循序渐进地学习变量、表达式、语句、函数和数据结构。此外，书中还探讨了如何处理文件和数据库，如何理解对象、方法和面向对象编程，如何使用调试技巧来修正语法、运行时和语义错误。每一章都配有术语表和练习题，方便读者巩固所学的知识和技巧。此外，每一章都抽出一节来讲解如何调试程序。作者针对每章中所专注的语言特性，或者相关的开发问题，总结了调试的方方面面。可以说这是一种非常有益的创新，让初学编程的读者少走很多弯路。 全书共19章和3个附录，详细介绍了python语言编程的方方面面。《像计算机科学...

Build real-world Artificial Intelligence applications with Python to intelligently interact with the world around you.

《像计算机科学家一样思考python》按照培养读者像计算机科学家一样的思维方式的思路来教授python语言编程。全书贯穿的主体是如何思考、设计、开发的方法，而具体的编程语言，只是提供一个具体场景方便介绍的媒介。《像计算机科学家一样思考python》并不是一本介绍语言的书，而是一本介绍编程思想的书。和其他编程设计语言书籍不同，它不拘泥于语言细节，而是尝试从初学者的角度出发，用生动的示例和丰富的练习来引导读者渐入佳境。 作者从最基本的编程概念开始讲起，包括语言的语法和语义，而且每个编程概念都有清晰的定义，引领读者循序渐进地学习变量、表达式、语句、函数和数据结构。此外，书中还探讨了如何处理文件和数据库，如何理解对象、方法和面向对象编程，如何使用调试技巧来修正语法、运行时和语义错误。每一章都配有术语表和练习题，方便读者巩固所学的知识和技巧。此外，每一章都抽出一节来讲解如何调试程序。作者针对每章中所专注的语言特性，或者相关的开发问题，总结了调试的方方面面。可以说这是一种非常有益的创新，让初学编程的读者少走很多弯路。 全书共19章和3个附录，详细介绍了python语言编程的方方面面。《像计算机科学...

如果您觉得Python很难学，学这本吧。 如果您觉得孩子应学点编程锻炼逻辑思维，用这本吧。 如果您觉得老爸无聊，想开个玩笑，送这本吧。

Use Python to build programs, debug code, and simplify development. Wrap yourself up in the structures, libraries, and advanced features of Python. Looking for a powerful yet easy-to-read programming language? Then slither up to Python! This friendly reference introduces you to Python, the portable, interactive language that combines great power with clear syntax. Get familiar with Python's building blocks; work with strings, dictionaries, and sets; and find out everything you need to write a ro...

Concurrency brings new benefits to your work. So take the time to learn how to bring those benefits to your C# apps with this title. Starting with the traditional approach to concurrency, you will learn how to write multithreaded concurrent programs and compose ways that won't require locking. You will explore the concepts of parallelism granularity, and fine-grained and coarse-grained parallel tasks by choosing a concurrent program structure and paralleling the workload optimally. You will also...

作为主流的动态语言，Python不仅简单易学、移植性好，而且拥有强大丰富的库的支持。此外，Python强大的可扩展性，让开发人员既可以非常容易地利用C/C++编写Python的扩展模块，还能将Python嵌入到C/C++程序中，为自己的系统添加动态扩展和动态编程的能力。. 为了更好地利用Python语言，无论是使用Python语言本身，还是将Python与C/C++交互使用，深刻理解Python的运行原理都是非常重要的。本书以CPython为研究对象，在C代码一级，深入细致地剖析了Python的实现。书中不仅包括了对大量Python内置对象的剖析，更将大量的篇幅用于对Python虚拟机及Python高级特性的剖析。通过此书，读者能够透彻地理解Python中的一般表达式、控制结构、异常机制、类机制、多线程机制、模块的动态加载机制、内存管理机制等核心技术的运行原理，同时，本书所揭示的动态语言的核心技术对于理解其他动态语言，如 Javascript、Ruby等也有较大的参考价值。.. 本书适合于Python程序员、动态语言爱好者、C程序员阅读

Get a comprehensive, in-depth introduction to the core Python language with this hands-on book. Based on author Mark Lutz’s popular training course, this updated fifth edition will help you quickly write efficient, high-quality code with Python. It’s an ideal way to begin, whether you’re new to programming or a professional developer versed in other languages. Complete with quizzes, exercises, and helpful illustrations, this easy-to-follow, self-paced tutorial gets you started with both Python 2...

本书是一本Python入门书籍，适合对计算机了解不多，没有学过编程，但对编程感兴趣的读者学习使用。这本书以习题的方式引导读者一步一步学习编程，从简单的打印一直讲到完整项目的实现，让初学者从基础的编程技术入手，最终体验到软件开发的基本过程。 本书结构非常简单，共包括52个习题，其中26个覆盖了输入/输出、变量和函数三个主题，另外26个覆盖了一些比较高级的话题，如条件判断、循环、类和对象、代码测试及项目的实现等。每一章的格式基本相同，以代码习题开始，按照说明编写代码，运行并检查结果，然后再做附加练习。 Zed Shaw完善了这个堪称世上最好的Python学习系统。只要跟着学习，你就会和迄今为止数十万Zed教过的初学者一样获得成功。 在这本书中，你将通过完成52个精心设计的习题来学会Python。阅读这些习题，把习题的代码精确地写出来（禁止复制和粘贴！），修正你的错误，观察程序的运行。在这个过程中，你将了解软件是如何工作的，好的程序看起来是什么样子，怎样阅读、编写、思考代码，以及如何用专业程序员的技巧来找出并修正错误。最重要的是，你将学到下面这些编写优秀的Python软件必需的初始技能。 这...

Are you an Android developer with some experience under your belt? Are you wondering how the experts create efficient and good-looking apps? Then your wait will end with this book! We will teach you about different Android development patterns that will enable you to write clean code and make your app stand out from the crowd. The book starts by introducing the Android development environment and exploring the support libraries. You will gradually explore the different design and layout patte...

用于在Android Studio开发的教程

You Need To Learn To Become A Master Programmer

21天学通C语言·[美]Bradley L. Jones Peter Aitken

Learning Python is an introduction to the increasingly popular Python programming language—an interpreted, interactive, object-oriented, and portable scripting language. This book thoroughly introduces the elements of Python: types, operators, statements, classes, functions, modules, and exceptions. It also demonstrates how to perform common programming tasks and write real applications.

提供Java语言的一些设计模型，以及应用该模型的例子。

Excel函数是预先定义，执行计算、分析等处理数据任务的特殊公式。

Praise for the First Edition "I sure wish I had this book ten years ago. Some might think that I don't need any Java books, but I need this one." —James Gosling, fellow and vice president, Sun Microsystems, Inc., and inventor of the Java programming language

This is a book about the JavaScript programming language. It is intended for programmers who, by happenstance or curiosity, are venturing into JavaScript for the first time.

这是一本简洁，完整的C#参考手册，不适用于初学者。