a sample data including apk description
Stemming a text file with tokenizing it, removing whitespace, punctuation

Feed a text file to stem_text.py and you can get a text file including
stemmed words.

Now, there has three options for stemmer such as following
[stemmer]
lancaster
porter
snowball

Usage:
$ python stem_text.py [stemmer] [input_file] [outout_file]

Example:
$ python stem_text.py lancaster
data/text/description.com.nytimes.android.txt stemmed_by_lancaster.txt