lxml
lxml is a Python library for processing XML and HTML documents, providing a high-performance, feature-rich interface to the libxml2 and libxslt C libraries. It combines the speed of C with the simplicity of Python, offering support for XPath, XSLT, and validation against XML schemas. It is widely used for web scraping, parsing, and transforming structured data in Python applications.
Developers should learn lxml when they need efficient XML/HTML parsing in Python, especially for tasks like web scraping, data extraction, or handling large XML files where performance is critical. It is ideal for projects requiring XPath queries, XSLT transformations, or integration with other Python libraries like BeautifulSoup for enhanced HTML handling. Use cases include building web crawlers, processing RSS feeds, or working with SOAP/XML-based APIs.