Web Scraping

Scrapy is an application framework for crawling web sites and extracting structured data. It schedules and processes requests asynchronously, so one slow page doesn't hold up the crawl. Start with scrapy startproject, write a spider class whose callbacks yield items, and send those items through item pipelines that clean, validate, deduplicate, or store them.

Crawl4AI turns any website into clean, LLM-ready Markdown for RAG, AI agents, and data pipelines. Its AsyncWebCrawler launches a headless browser and converts each page's HTML to Markdown. Give arun() one URL, or give arun_many() a list, which it crawls with concurrency control.

Browser Use runs its agent locally from Python, with your choice of model and a local or cloud browser. Create an Agent with a task and an LLM, then await agent.run().

Stagehand lets you mix AI steps with deterministic browser control in one script and decide how much AI each step uses. Call page methods like goto and click when you know the selector, and the self-healing act(), extract(), and observe() where a selector would break when the site changes.

Scrapling is an adaptive web scraping framework that handles everything from a single request to a full-scale crawl. Turn on adaptive in its fetcher and select elements with auto_save=True. When a redesign breaks a selector, run it again with adaptive=True, and Scrapling finds the element most similar to the one it saved, without AI. Use Fetcher when HTTP requests alone can get the page, and a browser fetcher for dynamically loaded sites. For a crawl, write a Spider with start_urls and an async parse() that yields items, a pattern familiar from Scrapy.

markdownify converts HTML to Markdown: call markdownify() on an HTML string. It converts all the HTML you give it, so for an article's main text, use Trafilatura.

feedparser has one main function, parse(), which takes a URL, a local file, or a string and reads RSS, Atom, and JSON feeds. When you poll a feed, pass its last ETag and Last-Modified values back: without them you download unchanged feeds again, and the publisher may ban you.

Trafilatura returns a page's main text without the navigation, ads, and boilerplate, with no selectors to write. Its FAQ pairs it with Scrapy: Scrapy crawls, Trafilatura extracts. extract() is the default choice among its functions.

Let sites know who's crawling. Scrapy's tutorial says to set USER_AGENT to a project name plus a URL or an email address, so site owners can ask you to adjust your crawler instead of blocking it. feedparser's docs also say to set the User-Agent to your application's name and URL.

With a browser agent, keep passwords away from the model: Browser Use shows the LLM only placeholders, and Stagehand fills in variables after the model picks the action. Then check the agent's work: Browser Use's docs say to verify important outcomes against the destination system.