HTML Article cleaner / extractor, Five-Filters compatible.
FTR is a partial (re-)implementation of the [Five-Filters extractor ](http://fivefilters.org/) in Python.
It cleans up HTML web pages and extract their content and metadata for a more comfortable reading experience (or whatever you need it for). It uses a centralized and mutualized repository of configuration files to parse websites at the most precise level possible, and fallbacks to the well-known readability automatic extractor if no configuration is found.
A notable difference is that this python implementation will fetch the website configuration from a centralized repository on the internet on the fly if no configuration is found locally.
[Full documentation is available](http://python-ftr.readthedocs.org).
## Differences with the FiveFilters PHP implementation
python-ftr : - has only one parser library (lxml) for now. The html5lib has not been ported yet. - does not convert date strings to datetime objects. I felt this more flexible to handle them at the upper level, giving access to custom datetime parsers. This is likely to change if I implement passing a custom parsing function to the extractor. - uses [readability-lxml](https://github.com/buriy/python-readability) for cleaning after non-automatic body extraction. Even if it’s a port of Arc90 readability.js like the [PHP Readability port](https://github.com/wallabag/wallabag/blob/master/inc/3rdparty/libraries/readability/Readability.php) used by Five Filters, it could eventually produce different results from it given the way they compute weight on contents (I didn’t compare them code-wise). - does not fallback to automatic parsing when no site config is available, but it does partially when a config is found and fails. As python-ftr was created to be included in a complex parsing chain, we had no need for an automatic parsing when there is no config for current site. See below for details. - has no fingerprints support. This feature looked unfinished or at least not enough documented for me to understand it in the original code. - does not use the global five-filters config file at all. The .txt looked unmaintained, and generic fallbacks can still be implemented outside of this module : you can provide your own global config via an argument when using the API.
## Automatic extraction
If you need fully-automatic parsing in no-config-found situations — which are easily detectable because process() and the low-level API raise SiteConfigNotFound — just use readability-lxml, breadability, python-goose, soup-strainer or whatever fits you.
In the case of an existing config but parsing failing for whatever reason, we still honor autodetect_on_failure and try to extract at least a title and a body via readability-lxml.
This is not as featureful as the PHP implementation which tries to extract date, language and authors via other ways, but still better than nothing.
When automatic extraction is used, the ContentExtractor instance will have a .failures attributes, listing exactly which non-automatic extraction(s) failed.
In the case where a config is found but it has no site or body directive (eg. automatic extraction should be explicitely used), the .failures attributes will not be set if automatic extraction worked.
See [issues wishlist](/1flow/python-ftr/labels/wishlist) for a dynamic todo list.
GNU Affero GPL version 3.