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This article mainly explains "what is the structure of Python crawler". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the architecture of Python crawler"?

Overview

Python crawler mainly refers to the capture and processing of network data. Compared with other programming languages, python contains a large number of built-in packages, which is very suitable for the development of web crawlers and can easily achieve the functions of crawlers.

Architecture composition of Python crawler

URL Manager: used to manage URL collections and pass the URL to be crawled to the web downloader

Web page downloader: crawl the corresponding web page, store it as a string, and then send it to the web page parser

Web page parser: analyze the valuable data in the web page and store it, while adding URL to the URL manager.

How reptiles work

The process of determining whether there is a URL waiting to crawl through the URL manager, if so, passing it to the downloader through the scheduler, downloading the URL content, then passing it to the parser through the scheduler, parsing the URL content, and transmitting valuable data and new URL lists to the application through the scheduler, and outputting the data.

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