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html5lib is a pure-python library for parsing HTML. It is designed to conform to the WHATWG HTML specification, as is implemented by all major web browsers.
Simple usage follows this pattern:
import html5lib
with open("mydocument.html", "rb") as f:
document = html5lib.parse(f)or:
import html5lib
document = html5lib.parse("<p>Hello World!")By default, the document will be an xml.etree element instance.
Whenever possible, html5lib chooses the accelerated ElementTree
implementation (i.e. xml.etree.cElementTree on Python 2.x).
Two other tree types are supported: xml.dom.minidom and
lxml.etree. To use an alternative format, specify the name of
a treebuilder:
import html5lib
with open("mydocument.html", "rb") as f:
lxml_etree_document = html5lib.parse(f, treebuilder="lxml")When using with urllib2 (Python 2), the charset from HTTP should be
pass into html5lib as follows:
from contextlib import closing
from urllib2 import urlopen
import html5lib
with closing(urlopen("http://example.com/")) as f:
document = html5lib.parse(f, transport_encoding=f.info().getparam("charset"))When using with urllib.request (Python 3), the charset from HTTP
should be pass into html5lib as follows:
from urllib.request import urlopen
import html5lib
with urlopen("http://example.com/") as f:
document = html5lib.parse(f, transport_encoding=f.info().get_content_charset())To have more control over the parser, create a parser object explicitly. For instance, to make the parser raise exceptions on parse errors, use:
import html5lib
with open("mydocument.html", "rb") as f:
parser = html5lib.HTMLParser(strict=True)
document = parser.parse(f)When you're instantiating parser objects explicitly, pass a treebuilder
class as the tree keyword argument to use an alternative document
format:
import html5lib
parser = html5lib.HTMLParser(tree=html5lib.getTreeBuilder("dom"))
minidom_document = parser.parse("<p>Hello World!")More documentation is available at https://html5lib.readthedocs.io/.
html5lib works on CPython 2.7+, CPython 3.4+ and PyPy. To install it, use:
$ pip install html5libThe following third-party libraries may be used for additional functionality:
datrie can be used under CPython to improve parsing performance
(though in almost all cases the improvement is marginal);lxml is supported as a tree format (for both building and
walking) under CPython (but not PyPy where it is known to cause
segfaults);genshi has a treewalker (but not builder); andchardet can be used as a fallback when character encoding cannot
be determined.Please report any bugs on the issue tracker.
Unit tests require the pytest and mock libraries and can be
run using the py.test command in the root directory.
Test data are contained in a separate html5lib-tests repository and included as a submodule, thus for git checkouts they must be initialized:
$ git submodule init $ git submodule update
If you have all compatible Python implementations available on your
system, you can run tests on all of them using the tox utility,
which can be found on PyPI.
There's a mailing list available for support on Google Groups, html5lib-discuss, though you may get a quicker response asking on IRC in #whatwg on irc.freenode.net.