What PyQuery does
PyQuery loads HTML from a string, URL, or file and hands it to you through a jQuery-like API. You give it a CSS selector - for example
pq('div.price') picks out matching elements - and then chain methods to read text, read attributes, or move around the DOM (the page's tree of nested tags). Because it sits on lxml, parsing is fast, and the short syntax feels natural to anyone comfortable with jQuery.PyQuery vs Beautiful Soup
Both parse static HTML in Python; the difference is mostly style. PyQuery wins on familiarity and brevity if you think in jQuery selectors; Beautiful Soup is more widely used, more forgiving of messy markup, and has a larger community. For raw speed, both can lean on lxml. The choice is mostly about ergonomics - they solve the same problem.
PyQuery's scraping limits
Like other parsers, PyQuery only reads the HTML you give it - it doesn't run JavaScript and has no proxy or anti-bot handling. So on its own it can't render a single-page app (a site that builds its content with JavaScript in the browser) or handle a Cloudflare challenge. The reliable pattern is to fetch fully rendered HTML through a web scraping API, then parse it with PyQuery (or Beautiful Soup).