NZB is an XML-based file format for retrieving posts from NNTP (Usenet)
Since NZB is XML-based, it's relatively easy to build one-off parsers to parse
NZB files. This project is an attempt to consolidate those many one-off NZB
parsers into one simple interface.
This package includes three implementations: one based on expat, another
on ElementTree, and a final implementation based on lxml. The order in which
they were listed is in order of compatibility. The expat version should work on
all versions of Python > 2.0, the lxml one will work on all versions > 2.5, and
lxml will only work if you have lxml installed.
A Note on Installing lxml
While lxml is not a requirement, I have had a hard time installing lxml in the
past. I have found this set of commands to work perfectly::
STATIC_DEPS=true easy_install 'lxml>=2.2beta4'
STATIC_DEPS=true sudo easy_install 'lxml>=2.2beta4'
Accessing the Default Parser
Simply import nzb_parser from the pynzb package. It's an instantiated version
of the fastest available parser that your system can support.
Other Parser Locations
Available in the ``pynzb.expat_nzb`` namespace.
Available in the ``pynzb.etree_nzb`` namespace.
Available in the ``pynzb.lxml_nzb`` namespace.
Using the NZB Parser
If you're using a specific parser, like the ``ETreeNZBParser``, you will first
have to instantiate it::
nzb_parser = ETreeNZBParser()
Otherwise, you can just import the default parser for your system::
from pynzb import nzb_parser
Then, simply call the ``parse`` method, giving it the xml string as the only
files = nzb_parser.parse('<?xml ... my nzb file here ... </nzb>')
This will return a list of ``NZBFiles`` for you to use.
All of the parsers return ``NZBFile`` objects, which are objects with the
The name of the user who posted the file to the newsgroup.
A ``datetime.date`` representation of when the server first saw the file.
The subject used when the user posted the file to the newsgroup.
A list of strings representing the newsgroups in which this file may be
A list of ``NZBSegment`` objects talking about where to get the contents
of this file.
Each ``NZBFile`` has a list of ``NZBSegment`` objects, which include
on how to retrieve a part of a file. Here's what you can find on an
The number of the segment in the list of files.
The size of the segment, in bytes.
The Message-ID of the segment (useful for retrieving the full contents)
In this example, we will grab an Ubuntu NZB and parse the file, printing out
some information about each file and its segments::
from pynzb import nzb_parser
from urllib2 import urlopen
# Grab a sample Ubuntu NZB
ubuntu_nzb = urlopen('http://media.eflorenzano.com/misc/sample-ubuntu-
# Parse the NZB into files
files = nzb_parser.parse(ubuntu_nzb)
# Print out each file's subject and the first two segment message ids
for nzb_file in files:
for segment in nzb_file.segments[:2]:
print ' ' + segment.message_id
if len(nzb_file.segments) > 2:
print ' ...'
TODO: Brief introduction on what you do with files - including link to relevant help section.