186 lines
6.5 KiB
Markdown
186 lines
6.5 KiB
Markdown
=============
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Feedgenerator
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=============
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[
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](https://travis-ci.org/lkiesow/python-feedgen)
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This module can be used to generate web feeds in both ATOM and RSS format. It
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has support for extensions. Included is for example an extension to produce
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Podcasts.
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It is licensed under the terms of both, the FreeBSD license and the LGPLv3+.
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Choose the one which is more convenient for you. For more details have a look
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at license.bsd and license.lgpl.
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More details about the project:
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- Repository: https://github.com/lkiesow/python-feedgen
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- Documentation: http://lkiesow.github.io/python-feedgen/
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- Python Package Index: https://pypi.python.org/pypi/feedgen/
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------------
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Installation
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------------
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**Prebuild packages**
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If you are running Fedora Linux, RedHat Enterprise Linux, CentOS or Scientific
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Linux you can use the RPM Copr repostiory:
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[http://copr.fedoraproject.org/coprs/lkiesow/python-feedgen/
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](http://copr.fedoraproject.org/coprs/lkiesow/python-feedgen/)
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Simply enable the repository and run:
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$ yum install python-feedgen
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or for the Python 3 package:
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$ yum install python3-feedgen
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**Using pip**
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You can also use pip to install the feedgen module. Simply run::
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$ pip install feedgen
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-------------
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Create a Feed
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-------------
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To create a feed simply instanciate the FeedGenerator class and insert some
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data::
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>>> from feedgen.feed import FeedGenerator
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>>> fg = FeedGenerator()
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>>> fg.id('http://lernfunk.de/media/654321')
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>>> fg.title('Some Testfeed')
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>>> fg.author( {'name':'John Doe','email':'john@example.de'} )
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>>> fg.link( href='http://example.com', rel='alternate' )
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>>> fg.logo('http://ex.com/logo.jpg')
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>>> fg.subtitle('This is a cool feed!')
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>>> fg.link( href='http://larskiesow.de/test.atom', rel='self' )
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>>> fg.language('en')
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Note that for the methods which set fields that can occur more than once in a
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feed you can use all of the following ways to provide data:
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- Provide the data for that element as keyword arguments
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- Provide the data for that element as dictionary
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- Provide a list of dictionaries with the data for several elements
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Example::
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>>> fg.contributor( name='John Doe', email='jdoe@example.com' )
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>>> fg.contributor({'name':'John Doe', 'email':'jdoe@example.com'})
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>>> fg.contributor([{'name':'John Doe', 'email':'jdoe@example.com'}, ...])
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-----------------
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Generate the Feed
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-----------------
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After that you can generate both RSS or ATOM by calling the respective method::
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>>> atomfeed = fg.atom_str(pretty=True) # Get the ATOM feed as string
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>>> rssfeed = fg.rss_str(pretty=True) # Get the RSS feed as string
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>>> fg.atom_file('atom.xml') # Write the ATOM feed to a file
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>>> fg.rss_file('rss.xml') # Write the RSS feed to a file
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----------------
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Add Feed Entries
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----------------
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To add entries (items) to a feed you need to create new FeedEntry objects and
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append them to the list of entries in the FeedGenerator. The most convenient
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way to go is to use the FeedGenerator itself for the instantiation of the
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FeedEntry object::
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>>> fe = fg.add_entry()
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>>> fe.id('http://lernfunk.de/media/654321/1')
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>>> fe.title('The First Episode')
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The FeedGenerators method `add_entry(...)` without argument provides will
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automatically generate a new FeedEntry object, append it to the feeds internal
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list of entries and return it, so that additional data can be added.
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----------
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Extensions
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----------
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The FeedGenerator supports extension to include additional data into the XML
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structure of the feeds. Extensions can be loaded like this::
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>>> fg.load_extension('someext', atom=True, rss=True)
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This will try to load the extension “someext” from the file `ext/someext.py`.
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It is required that `someext.py` contains a class named “SomextExtension” which
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is required to have at least the two methods `extend_rss(...)` and
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`extend_atom(...)`. Although not required, it is strongly suggested to use
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`BaseExtension` from `ext/base.py` as superclass.
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`load_extension('someext', ...)` will also try to load a class named
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“SomextEntryExtension” for every entry of the feed. This class can be located
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either in the same file as SomextExtension or in `ext/someext_entry.py` which
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is suggested especially for large extensions.
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The parameters `atom` and `rss` control if the extension is used for ATOM and
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RSS feeds, respectively. The default value for both parameters is `true`
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meaning the extension is used for both kinds of feeds.
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**Example: Producing a Podcast**
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One extension already provided is the podcast extension. A podcast is an RSS
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feed with some additional elements for ITunes.
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To produce a podcast simply load the `podcast` extension::
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>>> from feedgen.feed import FeedGenerator
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>>> fg = FeedGenerator()
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>>> fg.load_extension('podcast')
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...
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>>> fg.podcast.itunes_category('Technology', 'Podcasting')
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...
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>>> fe = fg.add_entry()
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>>> fe.id('http://lernfunk.de/media/654321/1/file.mp3')
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>>> fe.title('The First Episode')
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>>> fe.description('Enjoy our first episode.')
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>>> fe.enclosure('http://lernfunk.de/media/654321/1/file.mp3', 0, 'audio/mpeg')
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...
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>>> fg.rss_str(pretty=True)
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>>> fg.rss_file('podcast.xml')
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Of cause the extension has to be loaded for the FeedEntry objects as well but
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this is done automatically by the FeedGenerator for every feed entry if the
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extension is loaded for the whole feed. You can, however, load an extension for
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a specific FeedEntry by calling `load_extension(...)` on that entry. But this
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is a rather uncommon use.
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You can still produce a normal ATOM or RSS feed, even if you have loaded some
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plugins by temporary disabling them during the feed generation. This can be
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done by calling the generating method with the keyword argument `extensions`
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set to `False`.
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**Example: Producing a Podcast**
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If you want to load custom extension which are not part of the feedgen Python
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package, you can use the method `register_extension` instead. You can directly
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pass the classes for the feed and the entry extension to this method meaning
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that you can define them everywhere.
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---------------------
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Testing the Generator
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---------------------
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You can test the module by simply executing::
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$ python -m feedgen
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If you want to have a look at the code for this test to have a working code
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example for a whole feed generation process, you can find it in the
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[`__main__.py`](https://github.com/lkiesow/python-feedgen/blob/master/feedgen/__main__.py).
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