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Learn Scrapy for Python Web Crawling and Scraping

Scrapy: Powerful Web Scraping & Crawling with Python
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Scrapy: Powerful Web Scraping & Crawling with Python

Created by GoTrained Academy, Lazar Telebak

Last updated on 01/2019

Python Scrapy Tutorial - Learn how to scrape websites and build a powerful web crawler using Scrapy and Python

Scrapy is a free and open source web crawling framework, written in Python. Scrapy is useful for web scraping and extracting structured data  which can be used for a wide range of useful applications, like data  mining, information processing or historical archival. Python Scrapy  tutorial covers the fundamental of Scrapy.

Web scraping is a technique for gathering data or information on web pages. You could revisit your favorite web site every time it updates  for new information. Or you could write a web scraper to have it do it  for you!

Web crawling is usually the very first step of data research. Whether you are looking to obtain data from a website, track changes on the  internet, or use a website API, web crawlers are a great way to get the  data you need.

A web crawler, also known as web spider, is an application able to scan the World Wide Web and extract information in an automatic manner. While they have many components, web crawlers fundamentally use a  simple process: download the raw data, process and extract it, and, if  desired, store the data in a file or database. There are many ways to do  this, and many languages you can build your web crawler or spider in.

Before Scrapy, developers have relied upon various software packages for this job using Python such as urllib2 and BeautifulSoup which are  widely used. Scrapy is a new Python package that aims at easy, fast, and  automated web crawling, which recently gained much popularity.

Scrapy is now widely requested by many employers, for both freelancing and in-house jobs, and that was one important reason for creating this Python Scrapy course, and that was one important reason for creating this Python Scrapy tutorial to help you enhance your skills and earn more income.

In this Scrapy tutorial, you will learn how to install Scrapy. You will also build a basic and advanced spider, and finally learn more about Scrapy architecture. Then you are going to learn about deploying spiders, logging into the websites with Scrapy. We will build a generic web crawler with Scrapy, and we will also integrate Selenium to work with Scrapy to iterate our pages. We will build an advanced spider with option to iterate our pages with Scrapy, and we will close it out using Close function with Scrapy, and then discuss Scrapy arguments. Finally, in this course, you will learn how to save the output to databases, MySQL and MongoDB. There is a dedicated section for diverse web scraping solved exercises... and updating.

One of the main advantages of Scrapy is that it is built on top of Twisted, an asynchronous networking framework. "Asynchronous" means that  you do not have to wait for a request to finish before making another  one; you can even achieve that with a high level of performance. Being implemented using a non-blocking (aka asynchronous) code for  concurrency, Scrapy is really efficient.

It is worth noting that Scrapy tries not only to solve the content  extraction (called scraping), but also the navigation to the relevant  pages for the extraction (called crawling). To achieve that, a core  concept in the framework is the Spider -- in practice, a Python object  with a few special features, for which you write the code and the framework is responsible for triggering it.

Scrapy provides many of the functions required for downloading websites and other content on the internet, making the development  process quicker and less programming-intensive. This Python Scrapy  tutorial will teach you how to use Scrapy to build web crawlers and web  spiders.

Scrapy is the most popular tool for web scraping and crawling written  in Python. It is simple and powerful, with lots of features and  possible extensions.

Python Scrapy Tutorial Topics:

This Scrapy course starts by covering the fundamentals of using Scrapy, and then concentrate on Scrapy advanced features of creating and automating web crawlers. The main topics of this Python Scrapy tutorial are as follows:

  • What Scrapy is, the differences between Scrapy and other Python-based web scraping libraries such as BeautifulSoup, LXML, Requests, and Selenium, and when it is better to use Scrapy.

  • This tutorial starts by how to create a Scrapy project and and then build a basic Spider to scrape data from a website.

  • Exploring XPath commands and how to use it with Scrapy to extract data.

  • Building a more advanced Scrapy spider to iterate multiple pages of a website and scrape data from each page.

  • Scrapy Architecture: the overall layout of a Scrapy project; what each field represents and how you can use them in your spider code.

  • Web Scraping best practices to avoid getting banned by the websites you are scraping.

  • In this Scrapy tutorial, you will also learn how to deploy a Scrapy web crawler to the Scrapy Cloud platform easily. Scrapy Cloud is a  platform from Scrapinghub to run, automate, and manage your web crawlers  in the cloud, without the need to set up your own servers.

  • This Scrapy tutorial also covers how to use Scrapy for web scraping authenticated (logged in) user sessions, i.e. on websites that require a username and password before displaying data.

  • This course concentrates mainly on how to create an advanced web crawler with Scrapy. We will cover using Scrapy CrawlSpider which is the  most commonly used spider for crawling regular websites, as it provides a  convenient mechanism for following links by defining a set of rules. We  will also use Link Extractor object which defines how links will be  extracted from each crawled page; it allows us to grab all the links on a  page, no matter how many of them there are.

  • Furthermore there is a complete section in this Scrapy tutorial to show you how to combine Selenium with Scrapy to create web crawlers of  dynamic web pages. When you cannot fetch data directly from the source,  but you need to load the page, fill in a form,  click somewhere, scroll down and so on,  namely if you are trying to scrape data from a website that has a lot of  AJAX calls and JavaScript execution to render webpages,  it is good to  use Selenium along with  Scrapy.

  • We will also discuss more functions that Scrapy offers after the spider is done with web scraping, and how to edit and use  Scrapy  parameters.

  • As the main purpose of web scraping is to extract data, you will learn how to write the output to CSV, JSON, and XML files.

  • Finally, you will learn how to store the data extracted by Scrapy into MySQL and MongoDB databases.

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