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R Web Scraping Quick Start Guide
Webscrapingisatechniquetoextractdatafromwebsites.Itsimulatesthebehaviorofawebsiteusertoturnthewebsiteitselfintoawebservicetoretrieveorintroducenewdata.ThisbookgivesyouallyouneedtogetstartedwithscrapingwebpagesusingRprogramming.YouwilllearnabouttherulesofRegExandXpath,keycomponentsforscrapingwebsitedata.Wewillshowyouwebscrapingtechniques,methodologies,andframeworks.Withthisbook'sguidance,youwillbecomecomfortablewiththetoolstowriteandtestRegExandXPathrules.Wewillfocusonexamplesofdynamicwebsitesforscrapingdataandhowtoimplementthetechniqueslearned.YouwilllearnhowtocollectURLsandthencreateXPathrulesforyourfirstwebscrapingscriptusingrvestlibrary.Fromthedatayoucollect,youwillbeabletocalculatethestatisticsandcreateRplotstovisualizethem.Finally,youwilldiscoverhowtouseSeleniumdriverswithRformoresophisticatedscraping.YouwillcreateAWSinstancesanduseRtoconnectaPostgreSQLdatabasehostedonAWS.Bytheendofthebook,youwillbesufficientlyconfidenttocreateend-to-endwebscrapingsystemsusingR.
目錄(84章)
倒序
- coverpage
- Title Page
- Dedication
- Packt Upsell
- Why subscribe?
- Packt.com
- Contributors
- About the author
- About the reviewer
- Packt is searching for authors like you
- Preface
- Who this book is for
- What this book covers
- To get the most out of this book
- Download the example code files
- Download the color images
- Conventions used
- Get in touch
- Reviews
- Introduction to Web Scraping
- Learning about data on the internet
- Introduction to XPath (XML Path)
- Data extraction systems
- Web scraping techniques
- Traditional copy and paste
- Text grabbing and regular expression
- Document Object Model (DOM)
- Semantic annotation recognition
- Web scraping tools
- JavaScript tools
- Web crawling frameworks
- Web crawling environment in R
- Summary
- XML Path Language and Regular Expression Language
- XML Path (XPath)
- Nodes
- Relationships between nodes
- Parent
- Child
- Sibling
- Ancestor
- Descendant
- Predicates
- Selecting unknown nodes
- Selecting several paths
- Regular expression language (Regex)
- How to match a single character
- How to match the characters of a set
- How to match words
- Exercises on RegEx and XPath
- RegEx exercises
- XPath exercises
- Summary
- Web Scraping with rvest
- Introducing rvest
- Step-by-step web scraping with rvest
- Writing XPath rules
- Writing your first scraping script
- Playing with data
- Summary
- Web Scraping with Rselenium
- Advantages and disadvantages of using Selenium for web scraping
- RSelenium
- Step-by-step web scraping with RSelenium
- Collecting data with RSelenium
- Summary
- Storing Data and Creating Cronjob
- Cloud engine models
- Infrastructure as a service (IaaS)
- Platform as a service (PaaS)
- Software as a service (SaaS)
- Mobile backend as a service (MBaaS)
- Function as a service (FaaS)
- Some of the cloud services
- Amazon Web Services (AWS)
- Google Cloud
- Cronjob
- Storing data and creating schedule jobs for web scraping
- Creating an AWS RDS Instance
- Connecting to the PostgreSQL database on AWS
- Creating cronjob
- Summary
- Other Books You May Enjoy
- Leave a review - let other readers know what you think 更新時(shí)間：2021-06-10 19:35:21
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