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A website and framework that tracks changes in online news articles over time.

Original installation at
A product of the Knight Mozilla MIT news hackathon in June 2012.
Authors: Eric Price (, Greg Price (,
 and Jennifer 8. Lee (

This is free software under the MIT/Expat license; see LICENSE.
The project's source code lives at .


You need to have installed on your local machine
* Git
* Python 2.6 or later
* Django and other Python libraries

On a Debian- or Ubuntu-based system, it may suffice (untested) to run
  $ sudo apt-get install git-core python-django python-django-south python-simplejson

On Mac OS, the easiest way may be to install pip:
and then
  $ pip install Django

Initial setup

  $ python website/ syncdb && python website/ migrate
  $ git init articles
  $ cd articles && touch x && git add x && git commit -m 'Initial commit'

Running NewsDiffs Locally

Do the initial setup above.  Then to start the webserver for testing:
  $ python website/ runserver

and visit http://localhost:8000/

Running the scraper

Do the initial setup above.  You will also need additional Python
libraries; on a Debian- or Ubuntu-based system, it may suffice
(untested) to run
  $ sudo apt-get install python-bs4 python-beautifulsoup

on a Mac, you will want something like

 $ pip install beautifulsoup4
 $ pip install beautifulsoup
 $ pip install html5lib

Note that we need two versions of BeautifulSoup, both 3.2 and 4.0;
some websites are parsed correctly in only one version.

Then run
  $ python website/ scraper

This will populate the articles repository with a list of current news
articles.  This is a snapshot at a single time, so the website will
not yet have any changes. To get changes, wait some time (say, 3
hours) and run 'python website/ scraper' again.  If any of
the articles have changed in the intervening time, the website should
display the associated changes.

The scraper will log progress to /tmp/newsdiffs_logging (which is
overwritten each run) and errors to /tmp/newsdiffs/logging_errs (which
is cumulative).

To run the scraper every hour, run something like:

 $ while true; do python website/ scraper; sleep 60m; done

or make a cron job.

Adding new sites to the scraper

The procedure for adding new sites to the scraper is outlined in
parsers/ .  You need to

  (1) Create a new parser module in parsers/ .  This should be a
      subclass of BaseParser (in parsers/  Model it off
      the other parsers in that directory.  You can test the parser
      with by running, e.g.,

$ python parsers/ bbc.BBCParser

      which will output a list of URLs to track, and

$ python parsers/ bbc.BBCParser

      which will output the text that NewsDiffs would store.

  (2) Add the parser to 'parsers' in parsers/

This should cause the scraper to start tracking the site.

To make the source display properly on the website, you will need
minor edits to two other files: website/frontend/ and
website/frontend/ (to define the display name and create a tab
for the source, respectively).  Search for 'bbc' to find the locations
to edit.


Automatic scraper that tracks changes in news articles over time.







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