了解网络抓取-Python教程-PHP中文网

了解网络抓取

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发布： 2024-11-01 16:15:01

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了解网络抓取

网络抓取是使用机器人从网站提取数据的过程，它涉及通过以编程方式检查所需的特定信息来从网页获取内容，其中可能包括文本、图像、价格、网址和标题。

注意
网络抓取必须负责任地进行，尊重服务条款和法律准则，因为某些网站限制数据提取。

网页抓取的应用

电子商务 - 监控竞争对手的价格趋势和产品可用性
市场研究 - 通过收集客户评论和行为模式进行研究
潜在客户生成 - 这涉及从某些目录中提取数据以构建目标外展列表
新闻和金融数据 – 收集最新新闻、金融市场趋势，以形成金融见解。
学术研究 – 收集数据进行分析研究

网页抓取工具
网络抓取工具可以帮助您更轻松地从网站收集信息，并且通常可以自动执行数据提取过程。

TOOL	DESCRIPTION	APPLICATION	BEST USED FOR
BeautifulSoup	Python library for parsing HTML and XML	Extracting content from static web pages, such as HTML tags and structured data tables	Projects that don’t need browsers interaction
Selenium	Browser automation tool that interacts with dynamic websites, filling forms, clicking buttons and handling javas cript content.	Extracting content from sites that require user interaction Scraping content generated by java script	Complex dynamic pages that offer infinite scroll
Scrapy	An open-source, python-based framework designed specifically for web scraping	Large-scale scraping projects and data pipelines	Crawling multiple pages, creating datasets from large websites and scraping structured data
Octoparse	A no-code tool with a drag-and-drop interface for building scraping workflows	Data collection for users without programming skills, especially for web pages that has job listings or social media profiles.	Quick data collection with no-code workflows
ParseHub	A visual extraction tool for scraping from dynamic websites using AI to understand and collect data from complex layouts	Scrapping data from AJAX-based websites, dashboards and interactive charts	Non-technical users who want to scrap data from complex, javascript-heavy websites.
Puppeteer	A Node.js library that provides high-level API to control chrome over the DevTools Protocol	Capturing and scraping dynamic java Script content, taking screenshots, generating PDFs and automated browser testing	Java script-heavy websites, especially when server-side data extraction is needed
Apify	A cloud-based scraping platform with an extensive library of ready made scraping tools, plus support for custom scripts.	Collecting large datasets or scrapping from multiple sources	Enterprise-level web scraping tasks that require scaling and automation

如果需要，您可以在一个项目中组合多个工具

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