Can crawlers only be written in python?

Crawlers can not only be written in python, but also can be implemented in many languages. Example C, C, C#, Perl, Python, Java, and Ruby can all be used to write crawlers. The principles are actually not much different, it is just a platform issue.

#What is a web crawler?

A web crawler is a program that automatically extracts web pages. It downloads web pages from the World Wide Web for search engines and is an important component of search engines. The traditional crawler starts from the URL of one or several initial web pages and obtains the URL on the initial web page. During the process of crawling the web page, it continuously extracts new URLs from the current page and puts them into the queue until certain stopping conditions of the system are met

What is the use of crawlers?

• As a general search engine web page collector. (google, baidu)

• Make a vertical search engine.

• Scientific research: online human behavior, online community evolution, human dynamics research, econometric sociology, complex networks, data mining , and other fields require a large amount of data, and web crawlers are a powerful tool for collecting relevant data.

• Web page collection

• Index creation

• Query sorting

What language is used to write crawlers?

C, C. Highly efficient and fast, suitable for general search engines to crawl the entire web. Disadvantages: development is slow, and writing is stinky and long.

Scripting language: Perl, Python, Java, Ruby. Simple, easy to learn, and good text processing can facilitate the detailed extraction of web content, but the efficiency is often not high and is suitable for focused crawling of a small number of websites.

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