The easiest way to get started is to install girth via pip and import the module:
pip install girth --upgrade
import girth
If you would like to build girth from source, check out the repository and install it
git clone https://github.com/eribean/girth.git
cd girth
python setup.py install
IRT response data should be stored in a 2D numpy array. This array holds the measured responses with the number of rows (vertical) equal to the number of items in the test, and the number of columns (horizontal) equal to the number of participants in the test.
It is up to the user to manipulate the data into this standardized format.