掌握Scrapy 1.0:轻松抓取网页数据的全面指南

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《Learning Scrapy PDF (2016)》是一本深度解析Scrapy 1.0版本的指南,这本书旨在帮助读者轻松地从各种来源抓取数据。随着Scrapy的最新升级,它提供了一种强大且高效的数据采集工具,使开发者能够以极低的投入实现自动化数据抓取。 书中的内容覆盖了Scrapy的基础和高级用法,从入门到实践,适合对网络爬虫感兴趣的Python开发者、数据分析师或任何需要大规模数据获取的人士。作者通过清晰的介绍,让读者了解Scrapy在构建高质量应用程序、快速开发Minimum Viable Products(MVP)以及应对大数据挑战中的作用,尤其是在搜索引擎优化场景中,Scrapy的爬虫技术可以有效地绕过表单提交。 书中首先介绍了Scrapy的基本概念,包括如何使用HelloScrapy示例来入门,阐述了掌握自动化数据抓取技术的重要性,如构建稳定的应用程序并制定实际的工作流程。接着深入讲解HTML和XPath的理解,因为这两种技术是Scrapy进行网页元素选择和数据提取的核心。HTML代表超文本标记语言,它是网页结构的基础,而XPath则是一种用于在XML和HTML文档中查找信息的语言,作者提供了丰富的XPath表达式示例,并指导读者如何利用Chrome等工具辅助获取XPath表达式。 此外,书中的“常见任务”章节展示了如何运用Scrapy解决实际问题,如数据抓取、数据清洗、存储和整合到现有系统中。作者强调了在数据抓取过程中,遵循网站的robots.txt协议和良好的网络公民行为至关重要,确保在合法范围内进行操作,避免侵犯版权或引起不必要的法律纠纷。 最后,该书以一个总结部分收尾,概述了学习Scrapy后可能面临的进一步挑战和扩展可能性,帮助读者在掌握了基本技能后继续深化对Scrapy的理解和应用。 如果你是IT专业人士,尤其是Python开发者,或者正在寻求提升数据抓取能力,这本书无疑是宝贵的资源。通过阅读《Learning Scrapy PDF (2016)》,你将不仅学会如何利用Scrapy进行高效的数据采集,还会了解如何将其融入到自己的项目中,从而加速项目的成功实施。
2016-02-27 上传
Paperback: 270 pages Publisher: Packt Publishing - ebooks Account (January 30, 2016) Language: English ISBN-10: 1784399787 ISBN-13: 978-1784399788 Key Features Extract data from any source to perform real time analytics. Full of techniques and examples to help you crawl websites and extract data within hours. A hands-on guide to web scraping and crawling with real-life problems and solutions Book Description This book covers the long awaited Scrapy v 1.0 that empowers you to extract useful data from virtually any source with very little effort. It starts off by explaining the fundamentals of Scrapy framework, followed by a thorough description of how to extract data from any source, clean it up, shape it as per your requirement using Python and 3rd party APIs. Next you will be familiarised with the process of storing the scrapped data in databases as well as search engines and performing real time analytics on them with Spark Streaming. By the end of this book, you will perfect the art of scarping data for your applications with ease What you will learn Understand HTML pages and write XPath to extract the data you need Write Scrapy spiders with simple Python and do web crawls Push your data into any database, search engine or analytics system Configure your spider to download files, images and use proxies Create efficient pipelines that shape data in precisely the form you want Use Twisted Asynchronous API to process hundreds of items concurrently Make your crawler super-fast by learning how to tune Scrapy's performance Perform large scale distributed crawls with scrapyd and scrapinghub