tentris 0.19.8b0

Python bindings for using the RDF graph database Tentris RDF rdflib

Running Tentris Using Python

Note: Connecting to local/remote Tentris instances via HTTP is supported on all plattforms. Running Tentris within python is only supported on Linux.

Getting Started

The Tentris Python library is a plugin for rdflib.

Native (Linux only)

With the native TentrisStore, Tentris is embedded in Python applications.

import tentris
import rdflib

# Create an RDFLib graph using Tentris as its backend
graph = rdflib.Graph(store="Tentris")

# Load the graph using the SPARQL Update operation `LOAD`
# https://www.w3.org/TR/2013/REC-sparql11-update-20130321/#load 
graph.update("LOAD <https://files.tentris.io/mona-lisa.ttl>")

# Query the Mona Lisa knowledge graph
query_str = """
   PREFIX foaf: <http://xmlns.com/foaf/0.1/>
   PREFIX dbr: <http://dbpedia.org/resource/>
   PREFIX dbo: <http://dbpedia.org/ontology/>

   SELECT ?name WHERE {
      dbr:Mona_Lisa dbo:author ?person .
      ?person foaf:name ?name .
   }
"""

for binding in graph.query(query_str):
    print(f"{binding.name.n3()}")

The TentrisStore operates in-memory and does not persist data in the disk. To use a disk-based instance of Tentris, the HTTP-based store should be used.

HTTP (Any Operating System)

Remote or local instances of Tentris can be queries using the HTTP-based TentrisHTTPStore.

Local

Assuming a Tentris server is running on the localhost listening to the default port, it can be queried as shown in the example below.

import tentris
import rdflib

graph = rdflib.Graph(store="TentrisHTTP")

for binding in graph.query("SELECT * WHERE { ?s ?p ?o } LIMIT 10"):
    print(f"{binding.s.n3()} {binding.p.n3()} {binding.o.n3()}")

Remote

To query remote instances of Tentris, the URL needs to be explicitly stated.

from tentris import TentrisHTTPStore
import rdflib

graph = rdflib.Graph(store=TentrisHTTPStore("https://dbpedia.data.dice-research.org"))

for binding in graph.query("SELECT * WHERE { ?s ?p ?o } LIMIT 10"):
    print(f"{binding.s.n3()} {binding.p.n3()} {binding.o.n3()}")

For more information about setting up a disk-based instance of Tentris, please refer to the chapter Binary.