Web scraping is an essential technique used in many organizations to scrape valuable data from web pages. This book will enable you to delve deeply into web scraping techniques and methodologies. This book will introduce you to the fundamental concepts of web scraping techniques and how they can be applied to multiple sets of web pages. We'll use powerful libraries from the Python ecosystem—such as Scrapy, lxml, pyquery, bs4, and others—to carry out web scraping operations. We will take an in-depth look at essential tasks to carry out simple to intermediate scraping operations such as identifying information from web pages, using patterns or attributes to retrieve information, and others. This book adopts a practical approach to web scraping concepts and tools, guiding you through a series of use cases and showing you how to use the best tools and techniques to efficiently scrape web pages. This book also covers the use of other popular web scraping tools, such as Selenium, Regex, and web-based APIs.By the end of this book, you will have learned how to efficiently scrape the web using different techniques with Python and other popular tools.

Richard Lawson来自澳大利亚，毕业于墨尔本大学计算机科学专业。毕业后，他创办了一家专注于网络爬虫的公司，为超过50个国家的业务提供远程工作。他精通于世界语，可以使用汉语和韩语对话，并且积极投身于开源软件。他目前在牛津大学攻读研究生学位，并利用业余时间研发自主无人机。

This book is aimed at developers who want to use web scraping for legitimate purposes. Prior programming experience with Python would be useful but not essential. Anyone with general knowledge of programming languages should be able to pick up the book and understand the principals involved.

Richard Lawson来自澳大利亚，毕业于墨尔本大学计算机科学专业。毕业后，他创办了一家专注于网络爬虫的公司，为超过50个国家的业务提供远程工作。他精通于世界语，可以使用汉语和韩语对话，并且积极投身于开源软件。他目前在牛津大学攻读研究生学位，并利用业余时间研发自主无人机。

This book is aimed at developers who want to use web scraping for legitimate purposes. Prior programming experience with Python would be useful but not essential. Anyone with general knowledge of programming languages should be able to pick up the book and understand the principals involved.

This book is ideal for Python programmers, web administrators, security professionals or someone who wants to perform web analytics would find this book relevant and useful. Familiarity with Python and basic understanding of web scraping would be useful to take full advantage of this book.

Ryan Mitchell 数据科学家、软件工程师，目前在波士顿LinkeDrive公司负责开发公司的API和数据分析工具。此前，曾在Abine公司构建网络爬虫和网络机器人。她经常做网络数据采集项目的咨询工作，主要面向金融和零售业。另著有Instant Web Scraping with Java。

Ryan Mitchell 数据科学家、软件工程师，目前在波士顿LinkeDrive公司负责开发公司的API和数据分析工具。此前，曾在Abine公司构建网络爬虫和网络机器人。她经常做网络数据采集项目的咨询工作，主要面向金融和零售业。另著有Instant Web Scraping with Java。

Hands-On Cryptography with Python is for security professionals who want to learn to encrypt and evaluate data, and compare different encryption methods.

Reactive programming is central to many concurrent systems, but it’s famous for its steep learning curve, which makes most developers feel like they're hitting a wall. With this book, you will get to grips with reactive programming by steadily exploring various conceptsThis hands-on guide gets you started with Reactive Programming (RP) in Python. You will learn abouta the principles and benefits of using RP, which can be leveraged to build powerful concurrent applications. As you progress through the chapters, you will be introduced to the paradigm of Functional and Reactive Programming (FaRP), observables and observers, and concurrency and parallelism. The book will then take you through the implementation of an audio transcoding server and introduce you to a library that helps in the writing of FaRP code. You will understand how to use third-party services and dynamically reconfigure an application.By the end of the book, you will also have learned how to deploy and scale your applications with Docker and Traefik and explore the significant potential behind the reactive streams concept, and you'll have got to grips with a comprehensive set of best practices.