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This article will explain in detail what Python crawlers can do. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

The word Python crawler appears more and more frequently in daily life. Do you know what Python crawler can do? Well, today the teacher will show you what Python crawlers can do.

Python crawler is a web crawler, which means to get the data you want on the web page through the program, that is, to grab the data automatically. We can use crawlers to crawl pictures, crawl videos and other data we want to crawl, as long as the data that can be accessed through the browser can be accessed by the crawler.

The Python crawler can get the source code of the web page, which contains some useful information of the web page; then the crawler constructs a request and sends it to the server, which receives the response and parses it. In fact, getting a web page-analyzing the source code of a web page-extracting information is the basic process of a crawler.

Python crawler has an important role, that is, to extract information, it can make messy data become organized, so that we can later process and analyze the data. The common approach of Python crawlers is to use regular expressions. Web page structure has certain rules, and there are some libraries that extract web page information according to web page node attributes, CSS selector or XPath. Using these libraries, web page information can be extracted efficiently and quickly.

What are the advantages of Python crawlers?

one. Simple: Python is a language that represents the idea of simplism.

two. Easy to use: Python is simple and easy to use because there are simple and easy-to-read documents.

three. Fast: run fast, because the standard libraries and third-party libraries in Python are written in C, so they are fast.

four. Free, open source: Python is one of the FLOSS (free / source code software), and users are free to release a copy of the software, read its source code, make changes to it, and use some of it in new free software.

five. Object oriented: Python supports both process oriented programming and object oriented programming. In a "process-oriented" language, programs are built from procedures or simply functions that are reusable code. In an "object-oriented" language, programs are built from objects that are a combination of data and functions.

The emergence of Python crawler brings convenience for us to collect information. More and more people begin to learn Python crawler. Do you know what Python crawler can do?

So much for sharing about what Python crawlers can do. I hope the above content can be helpful to everyone and learn more knowledge. If you think the article is good, you can share it for more people to see.

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