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html5lib
========
.. image:: https://github.com/html5lib/html5lib-python/actions/workflows/python-tox.yml/badge.svg
:target: https://github.com/html5lib/html5lib-python/actions/workflows/python-tox.yml
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.
Usage
-----
Simple usage follows this pattern:
.. code-block:: python
import html5lib
with open("mydocument.html", "rb") as f:
document = html5lib.parse(f)
or:
.. code-block:: python
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.
Two other tree types are supported: ``xml.dom.minidom`` and
``lxml.etree``. To use an alternative format, specify the name of
a treebuilder:
.. code-block:: python
import html5lib
with open("mydocument.html", "rb") as f:
lxml_etree_document = html5lib.parse(f, treebuilder="lxml")
When using with ``urllib.request`` (Python 3), the charset from HTTP
should be pass into html5lib as follows:
.. code-block:: python
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:
.. code-block:: python
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:
.. code-block:: python
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/.
Installation
------------
html5lib works on CPython 3.8+ and PyPy. To install:
.. code-block:: bash
$ pip install html5lib
The goal is to support a (non-strict) superset of the versions that `pip
supports
<https://pip.pypa.io/en/stable/installing/#python-and-os-compatibility>`_.
Optional Dependencies
---------------------
The following third-party libraries may be used for additional
functionality:
- ``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); and
- ``chardet`` can be used as a fallback when character encoding cannot
be determined.
Bugs
----
Please report any bugs on the `issue tracker
<https://github.com/html5lib/html5lib-python/issues>`_.
Tests
-----
Unit tests require the ``pytest`` and ``mock`` libraries and can be
run using the ``pytest`` command in the root directory.
Test data are contained in a separate `html5lib-tests
<https://github.com/html5lib/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.
Questions?
----------
Check out `the docs <https://html5lib.readthedocs.io/en/latest/>`_. Still
need help? Go to our `GitHub Discussions
<https://github.com/html5lib/html5lib-python/discussions>`_.
You can also browse the archives of the `html5lib-discuss mailing list
<https://www.mail-archive.com/html5lib-discuss@googlegroups.com/>`_.
|
