pystardog 0.16.0

Use Stardog with Python!

pystardog

Python wrapper for communicating with the Stardog HTTP server.

What is it?

This framework wraps all the functionality of a client for the Stardog Knowledge Graph, and provides access to a full set of functions such as executing SPARQL queries, administrative tasks on Stardog, and the use of the Reasoning API.

The implementation uses the HTTP protocol, since most of Stardog functionality is available using this protocol. For more information, go to the Stardog's HTTP Programming documentation.

Installation

pystardog is on PyPI so all you need is: pip install pystardog

Documentation

Documentation is readable at Read the Docs or can be built using Sphinx:

cd docs
pip install -r requirements.txt
make html

Tests

To run the tests locally, a valid Stardog license is required and placed in the dockerfiles/stardog-license-key.bin. Docker and docker-compose are also required.

1. Bring a stardog instance using docker-compose. For testing about 90% of the pystardog features, just a single node is sufficient, although we also provide a cluster set up for further testing.

# Bring a single node instance plus a bunch of Virtual Graphs for testing (Recommended).
docker-compose -f docker-compose.single-node.yml up -d

# A cluster set up is also provided, if cluster only features are to be implemented and tested.
docker-compose -f docker-compose.cluster.yml up -d

Run the test suite. Create a virtual environment with the neccesary dependencies:

# Create a virtualenv and activate it
virtualenv -p $(which python3) venv
source venv/bin/activate

# Install the dependencies
pip install -r requirements.txt -r test-requirements.txt 

# Run the basic test suite (covers most of the pystardog functionalities)
pytest test/test_admin_basic.py test/test_connection.py test/test_utils.py -s 

Format

To run a format of all the files

virtualenv -p $(which python3) venv
. venv/bin/activate
pip install -r test-requirements.txt
black .

Quick Example

import stardog

conn_details = {
  'endpoint': 'http://localhost:5820',
  'username': 'admin',
  'password': 'admin'
}

with stardog.Admin(**conn_details) as admin:
  db = admin.new_database('db')

  with stardog.Connection('db', **conn_details) as conn:
    conn.begin()
    conn.add(stardog.content.File('./test/data/example.ttl'))
    conn.commit()
    results = conn.select('select * { ?a ?p ?o }')

  db.drop()

Interactive Tutorial

There is a Jupyter notebook and instructions in the notebooks directory of this repository.