Go Web Scraping Quick Start Guide (eBook)
132 Seiten
Packt Publishing (Verlag)
978-1-78961-294-3 (ISBN)
Learn how some Go-specific language features help to simplify building web scrapers along with common pitfalls and best practices regarding web scraping.
Key Features
- Use Go libraries like Goquery and Colly to scrape the web
- Common pitfalls and best practices to effectively scrape and crawl
- Learn how to scrape using the Go concurrency model
Book Description
Web scraping is the process of extracting information from the web using various tools that perform scraping and crawling. Go is emerging as the language of choice for scraping using a variety of libraries. This book will quickly explain to you, how to scrape data data from various websites using Go libraries such as Colly and Goquery.
The book starts with an introduction to the use cases of building a web scraper and the main features of the Go programming language, along with setting up a Go environment. It then moves on to HTTP requests and responses and talks about how Go handles them. You will also learn about a number of basic web scraping etiquettes.
You will be taught how to navigate through a website, using a breadth-first and then a depth-first search, as well as find and follow links. You will get to know about the ways to track history in order to avoid loops and to protect your web scraper using proxies.
Finally the book will cover the Go concurrency model, and how to run scrapers in parallel, along with large-scale distributed web scraping.
What you will learn
- Implement Cache-Control to avoid unnecessary network calls
- Coordinate concurrent scrapers
- Design a custom, larger-scale scraping system
- Scrape basic HTML pages with Colly and JavaScript pages with chromedp
- Discover how to search using the 'strings' and 'regexp' packages
- Set up a Go development environment
- Retrieve information from an HTML document
- Protect your web scraper from being blocked by using proxies
- Control web browsers to scrape JavaScript sites
Who this book is for
Data scientists, and web developers with a basic knowledge of Golang wanting to collect web data and analyze them for effective reporting and visualization.
Learn how some Go-specific language features help to simplify building web scrapers along with common pitfalls and best practices regarding web scraping.Key FeaturesUse Go libraries like Goquery and Colly to scrape the webCommon pitfalls and best practices to effectively scrape and crawlLearn how to scrape using the Go concurrency modelBook DescriptionWeb scraping is the process of extracting information from the web using various tools that perform scraping and crawling. Go is emerging as the language of choice for scraping using a variety of libraries. This book will quickly explain to you, how to scrape data data from various websites using Go libraries such as Colly and Goquery.The book starts with an introduction to the use cases of building a web scraper and the main features of the Go programming language, along with setting up a Go environment. It then moves on to HTTP requests and responses and talks about how Go handles them. You will also learn about a number of basic web scraping etiquettes.You will be taught how to navigate through a website, using a breadth-first and then a depth-first search, as well as find and follow links. You will get to know about the ways to track history in order to avoid loops and to protect your web scraper using proxies.Finally the book will cover the Go concurrency model, and how to run scrapers in parallel, along with large-scale distributed web scraping.What you will learnImplement Cache-Control to avoid unnecessary network callsCoordinate concurrent scrapersDesign a custom, larger-scale scraping systemScrape basic HTML pages with Colly and JavaScript pages with chromedpDiscover how to search using the "e;strings"e; and "e;regexp"e; packagesSet up a Go development environmentRetrieve information from an HTML documentProtect your web scraper from being blocked by using proxiesControl web browsers to scrape JavaScript sitesWho this book is forData scientists, and web developers with a basic knowledge of Golang wanting to collect web data and analyze them for effective reporting and visualization.
| Erscheint lt. Verlag | 30.1.2019 |
|---|---|
| Sprache | englisch |
| Themenwelt | Sachbuch/Ratgeber ► Freizeit / Hobby ► Sammeln / Sammlerkataloge |
| Mathematik / Informatik ► Informatik ► Theorie / Studium | |
| Schlagworte | Colly • Concurrency • Go • golang • Goquery • Web Scraping |
| ISBN-10 | 1-78961-294-2 / 1789612942 |
| ISBN-13 | 978-1-78961-294-3 / 9781789612943 |
| Haben Sie eine Frage zum Produkt? |
EPUB (Adobe DRM)Größe: 2,9 MB
Kopierschutz: Adobe-DRM
Adobe-DRM ist ein Kopierschutz, der das eBook vor Mißbrauch schützen soll. Dabei wird das eBook bereits beim Download auf Ihre persönliche Adobe-ID autorisiert. Lesen können Sie das eBook dann nur auf den Geräten, welche ebenfalls auf Ihre Adobe-ID registriert sind.
Details zum Adobe-DRM
Dateiformat: EPUB (Electronic Publication)
EPUB ist ein offener Standard für eBooks und eignet sich besonders zur Darstellung von Belletristik und Sachbüchern. Der Fließtext wird dynamisch an die Display- und Schriftgröße angepasst. Auch für mobile Lesegeräte ist EPUB daher gut geeignet.
Systemvoraussetzungen:
PC/Mac: Mit einem PC oder Mac können Sie dieses eBook lesen. Sie benötigen eine
eReader: Dieses eBook kann mit (fast) allen eBook-Readern gelesen werden. Mit dem amazon-Kindle ist es aber nicht kompatibel.
Smartphone/Tablet: Egal ob Apple oder Android, dieses eBook können Sie lesen. Sie benötigen eine
Geräteliste und zusätzliche Hinweise
Buying eBooks from abroad
For tax law reasons we can sell eBooks just within Germany and Switzerland. Regrettably we cannot fulfill eBook-orders from other countries.
EPUB (Ohne DRM)Digital Rights Management: ohne DRM
Dieses eBook enthält kein DRM oder Kopierschutz. Eine Weitergabe an Dritte ist jedoch rechtlich nicht zulässig, weil Sie beim Kauf nur die Rechte an der persönlichen Nutzung erwerben.
Dateiformat: EPUB (Electronic Publication)
EPUB ist ein offener Standard für eBooks und eignet sich besonders zur Darstellung von Belletristik und Sachbüchern. Der Fließtext wird dynamisch an die Display- und Schriftgröße angepasst. Auch für mobile Lesegeräte ist EPUB daher gut geeignet.
Systemvoraussetzungen:
PC/Mac: Mit einem PC oder Mac können Sie dieses eBook lesen. Sie benötigen dafür die kostenlose Software Adobe Digital Editions.
eReader: Dieses eBook kann mit (fast) allen eBook-Readern gelesen werden. Mit dem amazon-Kindle ist es aber nicht kompatibel.
Smartphone/Tablet: Egal ob Apple oder Android, dieses eBook können Sie lesen. Sie benötigen dafür eine kostenlose App.
Geräteliste und zusätzliche Hinweise
Buying eBooks from abroad
For tax law reasons we can sell eBooks just within Germany and Switzerland. Regrettably we cannot fulfill eBook-orders from other countries.
aus dem Bereich
