What is a crawler?
Crawlers have a wide variety of uses on the internet. They automatically search through documents online. Website operators are mainly familiar with web crawlers from search engines such as Google or Bing; however, crawlers can also be used for malicious purposes and do harm to companies.
Tutorial And Helper Tools:
1. https://github.com/leVirve/CrawlerTutorial
2. https://github.com/scrapinghub/scrapyrt