精通Scrapy:网络数据抓取实战

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"Learning Scrapy" 本书《Learning Scrapy》旨在深入探讨Scrapy框架,一个用Python编写的高效网络爬虫工具。这本书适用于那些希望通过自动化数据抓取来扩展项目能力的开发人员,无论你是初学者还是有经验的程序员,都可以从中获益。书中将详细介绍Scrapy如何帮助构建强大且高质量的爬虫应用,并提供实际的时间安排,以快速开发出高质量的最小可行产品。 在第一章节“Introducing Scrapy”中,作者首先向读者介绍了Scrapy的基本概念。通过“Hello Scrapy”这个简单的例子,让读者对Scrapy有一个初步的认识。接着,作者强调了掌握自动化数据抓取的重要性,特别是在当今大数据时代,Scrapy能够帮助开发者实现规模化抓取,这一点对于像谷歌这样的搜索引擎巨头来说也不例外。书中还提到了如何将Scrapy整合到现有的生态系统中,并强调了作为网络爬虫应具备的公民意识,即在抓取数据时要尊重网站规则和用户隐私。 第二章“Understanding HTML and XPath”则深入讲解了HTML和XPath的基础知识。HTML是网页的结构语言,而XPath则是用于在XML或HTML文档中选取节点的语言。作者解释了HTML文档的DOM树结构,以及用户在浏览器中看到的页面内容与DOM树之间的关系。此外,章节还详细阐述了如何使用XPath表达式来选择HTML元素,提供了实用的XPath表达式示例,并介绍了如何利用Chrome浏览器来获取XPath表达式。最后,通过一些常见任务的例子,如查找链接、文本等,让读者更加熟练地掌握XPath的应用。 在后续章节中,预计会进一步介绍Scrapy的组件,如Spiders、Item、Item Pipeline、Middleware、Request/Response机制,以及如何处理反爬策略、数据存储、分布式爬虫等内容。此外,还会涉及Scrapy的最佳实践、调试技巧以及如何部署和维护Scrapy项目。 《Learning Scrapy》是一本全面介绍Scrapy框架的指南,适合希望提升网络爬虫技能的开发者,无论是为了数据分析、市场研究,还是其他基于Web的数据驱动项目,都能从中获得宝贵的知识和实践经验。
2016-05-23 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
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