How to write web crawlers

Please be aware that some of the sample outputs may be a bit different, since the Unhackathon website is updated occasionally. This springboard project will have you build a simple web crawler in Python using the Requests library. Once you have implemented a basic web crawler and understand how it works, you will have numerous opportunities to expand your crawler to solve interesting problems. This tutorial assumes that you have Python 3 installed on your machine.
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Web Crawler 101: What Is a Web Crawler and How Do Crawlers Work?

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What is a web crawler and how does it work?

There are a lot of useful information on the Internet. How can we automatically get those information? This post shows how to make a simple Web crawler prototype using Java. Making a Web crawler is not as difficult as it sounds. Just follow the guide and you will quickly get there in 1 hour or less, and then enjoy the huge amount of information that it can get for you. As this is only a prototype, you need spend more time to customize it for your needs.
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Writing A Web Crawler in Golang

A year or two after I created the dead simple web crawler in Python , I was curious how many lines of code and classes would be required to write it in Java. It turns out I was able to do it in about lines of code spread over two classes. That's it!
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Join Stack Overflow to learn, share knowledge, and build your career. Connect and share knowledge within a single location that is structured and easy to search. I have had thoughts of trying to write a simple crawler that might crawl and produce a list of its findings for our NPO's websites and content. Does anybody have any thoughts on how to do this? Where do you point the crawler to get started?
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