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lxml is the most feature-rich and easy-to-use library for working with XML and HTML in the Python language.

lxml is the most feature-rich and easy-to-use library for working with XML and HTML in the Python language.

lxml is a Pythonic binding for the libxml2 and libxslt libraries. It is unique in that it combines the speed and feature completeness of these libraries with the simplicity of a native Python API, mostly compatible but superior to the well-known ElementTree API. See the introduction for more information about background and goals.

lxml.etree follows the ElementTree API as much as possible, building it on top of the native libxml2 tree. If you are new to ElementTree, start with the lxml.etree Tutorial. See also the ElementTree compatibility overview and the benchmark results comparing lxml to the original ElementTree and cElementTree implementations.

Right after the lxml.etree Tutorial and the ElementTree documentation, the most important place to look is the lxml.etree specific API documentation. It describes how lxml extends the ElementTree API to expose libxml2 and libxslt specific functionality, such as XPath, Relax NG, XML Schema, XSLT, and c14n. Python code can be called from XPath expressions and XSLT stylesheets through the use of extension functions. lxml also offers a SAX compliant API, that works with the SAX support in the standard library.

There is a separate module lxml.objectify that implements a data-binding API on top of lxml.etree. See the objectify and etree FAQ entry for a comparison.

In addition to the ElementTree API, lxml also features a sophisticated API for custom element classes. This is a simple way to write arbitrary XML driven APIs on top of lxml. As of version 1.1, lxml.etree has a new C-level API that can be used to efficiently extend lxml.etree in external C modules, including custom element class support.

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What's New in This Release:

Features added:

В· lxml.objectify.deannotate() has a new boolean option cleanup_namespaces to remove the objectify namespace declarations (and generally clean up the namespace declarations) after removing the type annotations.
В· lxml.objectify gained its own SubElement() function as a copy of etree.SubElement to avoid an otherwise redundant import of lxml.etree on the user side.

Bugs fixed:

В· Fixed the "descendant" bug in cssselect a second time (after a first fix in lxml 2.3.1). The previous change resulted in a serious performance regression for the XPath based evaluation of the translated expression. Note that this breaks the usage of some of the generated XPath expressions as XSLT location paths that previously worked in 2.3.1.
В· Fixed parsing of some selectors in cssselect. Whitespace after combinators " >", "+" and "~" is now correctly ignored. Previously is was parsed as a descendant combinator. For example, "div > .foo" was parsed the same as "div >* .foo" instead of "div >.foo".

System Requirements:

В· Python
Program Release Status: Minor Update
Program Install Support: Install and Uninstall

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