# WikiExtractor
[WikiExtractor.py](http://medialab.di.unipi.it/wiki/Wikipedia_Extractor) is a Python script that extracts and cleans text from a [Wikipedia database dump](http://download.wikimedia.org/).

The tool is written in Python and requires Python 2.7 but no additional library.
**Warning**: problems have been reported on Windows with the use of multiprocessing.

For further information, see the [project Home Page](http://medialab.di.unipi.it/wiki/Wikipedia_Extractor) or the [Wiki](https://github.com/attardi/wikiextractor/wiki).

# Wikipedia Cirrus Extractor

`cirrus-extractor.py` is a version of the script that perfomrs extraction from a Wikipedia Cirrus dump.
Cirrus dumps contain text with already exmpanded templates.

Cirrus dumps are avilable at:
[http://dumps.wikimedia.org/other/cirrussearch/](cirrussearch).

# Details

WikiExtractor performs template expansion by preprocesssng the whole dump and extracting template definitions.

The latest version includes the following performance improvements:

- multiprocessing is used for dealing with articles in parallel (this requires a Python installation with proper implementation of the StringIO library)
- a cache is kept of parsed templates.

## Usage
The script is invoked with a Wikipedia dump file as an argument.
The output is stored in several files of similar size in a given directory.
Each file will contains several documents in this [document format](http://medialab.di.unipi.it/wiki/Document_Format).

    usage: WikiExtractor.py [-h] [-o OUTPUT] [-b n[KMG]] [-c] [--html] [-l]
			    [-ns ns1,ns2] [-s] [--templates TEMPLATES]
			    [--no-templates] [--processes PROCESSES] [-q] [--debug]
			    [-a] [-v]
			    input

    positional arguments:
      input                 XML wiki dump file

    optional arguments:
      -h, --help            show this help message and exit
      --processes PROCESSES number of processes to use (default: number of CPU cores)

    Output:
      -o OUTPUT, --output OUTPUT
			    a directory where to store the extracted files (or '-' for dumping to
                            stdout)
      -b n[KMG], --bytes n[KMG]
                            maximum bytes per output file (default 1M)
      -c, --compress        compress output files using bzip

    Processing:
      --html                produce HTML output, subsumes --links
      -l, --links           preserve links
      -ns ns1,ns2, --namespaces ns1,ns2
			    accepted namespaces
      --templates TEMPLATES
			    use or create file containing templates
      --no-templates        Do not expand templates
      --escapedoc           use to escape the contents of the output
                            <doc>...</doc>

    Special:
      -q, --quiet           suppress reporting progress info
      --debug               print debug info
      -a, --article         analyze a file containing a single article (debug option)
      -v, --version         print program version

Saving templates to a file will speed up performing extraction the next time,
assuming template definitions have not changed.

Option --no-templates significantly speeds up the extractor, avoiding the cost
of expanding [MediaWiki templates](https://www.mediawiki.org/wiki/Help:Templates).

For further information, visit [the documentation](http://attardi.github.io/wikiextractor).