Web scraping and social media scraping introduction
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1 Web scraping and social media scraping introduction Jacek Lewkowicz, Dorota Celińska University of Warsaw February 23, 2018
2 Motivation Definition of scraping Tons of (potentially useful) information on the Web Instead of manual gathering the information needed, we employ computer programs to do it automatically We have to understand the structure of the webpage and find general scheme for data collection Web scraping may be useful and efficient here
3 Web scraping Definition of scraping The process of taking unstructured information from the Web and processing it into structured data for later analysis Commonly used not only by researchers: Web crawlers/web spiders/search bots used by search engines
4 Bots, crawlers, spiders, scrapers... A bot is a software application that runs automated, usually repetitive tasks (scripts) over the Internet A crawler or spider is a bot which systematically browses the Internet, typically for the purpose of Web indexing. In other words, crawler surfs the web, following links it does not have to extract data A scraper takes downloaded pages and attempts to extract data from them. However, there are no precise defitnions
5 Example areas of usage Download results of general elections Download demo MP3 Download legal decisions Download comments and users activity from social media
6 Alternatives to traditional scraping ScraperWiki Google Refine Outwit SocSciBot (arguably) APIs, already scrapped collections of data available online (e.g. GHTorrent) or API mirrors
7 Is it legal? Definition of scraping Technically... usually it is. However, there are situations in which you are not allowed to gather the data from the given website Look for disclaimers and Terms of (Fair) Use Scraping may mean copyright infringement Data privacy, sensitive information web crawling difficult matter
8 Controversial cases ebay vs Bidder s Edge One company crawls information from another Facebook vs Meltwater Prior written permissions needed US vs Aaron Swartz AS arrested in 2011 for having illegally downloaded millions of articles from the article archive JSTOR. The case was dismissed after Swartz suicide in January 2013 GHTorrent #issue32 incident
9 Web scraping for social good or evil? People tend to be extremely paranoic about their data privacy, while being at the same time extremely careless about their data privacy Same people who cover their cameras in laptops, do not potentially care about the photos they upload to Facebook/other social media or the apps they are using Celebgate celebrity_photos AI gone too far... ai-can-tell-people-gay-straight-one-photo-face/
10 Web scraping for social good or evil? robots.txt Many web crawlers are hunting for content Web robots keep some indices actual robots.txt file and other methods are used for keep the server traffic in check User-agent: * Disallow: /private/
11 What makes a crawler polite? A polite crawler respects robots.txt A polite crawler never degrades a website s performance A polite crawler identifies its creator with contact information A polite crawler does not drive system administrators crazy
12 Responsible crawling #1 Terms of Use Make sure your crawler follows the rules contained in Terms of (Fair) Use Do check robots.txt file (we know you have no time) you may write a program, which parses robots.txt and enables to identify particular user-agents or corresponding rules of access!
13 Responsible crawling #2 Identify yourself Include your company name and an address or website in the request s User-Agent header For example, Google s crawler user agent is Googlebot.
14 Responsible crawling #3 Crawl delay Make sure your crawler does not hit a website too hard Respect the delay that crawlers should wait between requests by following the robots.txt Crawl-Delay directive If you do not... they will make you do :04: [working] DEBUG: Retrying (failed 1 times): 503 Service Unavailable
15 Responsible crawling #4 Take care of your data You should pay attention to what happens with the data you gathered Consider which part of the analyses and/or data sets can be displayed publicly Respect the sensitivity of the information
16 & ethics in a nutshell Respect the hosting site s wishes robots.txt as a list of instruction to bots/scrapers Terms of (Fair) Use which elements of the website you should not scrap Respect the hosting site s bandwidth Scraping may be costly or result in the site going down Respect the law Terms & agreements Take care of the data Consider which information can be displayed publicly or not If possible use APIs, APIs mirrors or collections of data already scraped for you
17 Requests library Definition of scraping Request library Beautiful Soup Scrapy Python core libraries may be enough, but there are more appropriate packages Requests library is suitable for complicated HTTP requests, cookies, headers and other issues
18 Beautiful... what? Definition of scraping Request library Beautiful Soup Scrapy Beautiful Soup is Python library Lewis Carroll s poem from Alice s Adventures in Wonderland The tool is for making sense of nonsensical Beautiful Soup, so rich and green, Waiting in a hot tureen! Who for such dainties would not stoop? Soup of the evening, beautiful Soup!
19 Installing Beautiful Soup Request library Beautiful Soup Scrapy Think about setting Python virtual environments Unixlike (Mac and GNU/Linux) sudo easy install pip pip install beautifulsoup4 Other environments python setup.py install pip install beautifulsoup4
20 Problems after installation Request library Beautiful Soup Scrapy Authors of the library suggest that usually known problems are related to Python 2 vs Python 3 issues...
21 Typical way of working Request library Beautiful Soup Scrapy You work with file containing python code and import the necessary libraries It requires some skills in programming
22 What is Scrapy? Definition of scraping Request library Beautiful Soup Scrapy Scrapy is a framework which means a lot of issues related to scraping have already been solved for you and you may use automagical tools to deal with them (with all the blessings and curses it provides) Requires minimal knowledge and skills in Python and programming Handles a lot of complexity of finding & evaluating links on a website, scraping whole domains or lists of domains
23 Scrapy installation Definition of scraping Request library Beautiful Soup Scrapy Think about setting Python virtual environments (recommended) Unixlike (Mac and GNU/Linux) sudo easy install pip pip install Scrapy Other environments Read the manual, recommended use of anaconda
24 Scrapy dependencies Request library Beautiful Soup Scrapy If you encounter problems during the installation, probably you should check for the dependencies, e.g.: lxml efficient XML and HTML parser w3lib a multi-purpose helper for dealing with URLs and web page encodings cryptography and pyopenssl to deal with various network-level security needs
25 Scrapy typical way of working Request library Beautiful Soup Scrapy You work with projects in a new directory Each Scrapy object stands for a single page on the website Each scrapper has a few core functions and structures Crawlers are run from the command line Troubleshooting usually within configuration files (settings.py)
26 Scrapy responsible scraping Request library Beautiful Soup Scrapy ROBOTSTXT OBEY = True USER AGENT = MyCompany-MyCrawler (bot@mycompany.com) DOWNLOAD DELAY CONCURRENT REQUESTS PER DOMAIN :12:56 [scrapy] DEBUG: Forbidden by robots.txt: <GET
27 Definition of scraping Install the libraries and frameworks on your hardware! Read the Introduction and Creating a project sections in Scrapy tutorial:
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