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scrapy 101 presentation for beginners

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  1. 1. Submitted by:- Snehil Verma
  2. 2. Scrapy is a fast open source web crawling framework written in Python, used to extract the data from web page with the help of selectors based on XPath.
  3. 3.  Beautiful Soup  Lxml  Newspaper
  4. 4.  It is easier to build and scale large crawling projects.  It has built-in mechanism called Selectors, for extracting the data from websites.  It handles the requests asynchronously and it is fast.  It automatically adjusts crawling speed using Auto-throttling mechanism.  Ensures developer accessibility.
  5. 5.  Scrapy is an open source and free to use web crawling framework.  Scrapy generates feed exports in formats like JSON, CSV, and XML.  Scrapy has built-in support for selecting and extracting data from sources either by XPath or CSS expressions.  Scrapy based on crawler, allows extracting data from web pages in an automatic way.
  6. 6.  Scrapy is easily extensible, fast and powerful.  It is a cross platform application framework (Windows, Linux, Mac OS and BSD).  Scrapy requests are scheduled and processed asynchronously.  Scrapy comes with built-in service called Scrapyd which allows to upload projects and control spiders using JSON web service.  It is possible to scrap any website, even if that website does not have API for raw data access.
  7. 7. You should have a basic understanding of Computer Programming terminologies and Python. A basic understanding of XPATH is a plus.
  8. 8. The command to install scrapy is -: pip install scrapy
  9. 9. Command to run the spider is:- scrapy runspider <spider.py> Or scrapy runspider <spider.py> -o file.(json/xml/csv)
  10. 10.  Scrapy is only for Python 2.7. +  Installation is different for different operating system.
  11. 11.  http://www.slideshare.net/previa/scrapyford ummies-15277988  https://www.tutorialspoint.com/scrapy/scrap y_overview.htm  https://www.scrapy.org/