skylerreimer / sparqlwrapper

A wrapper for a remote SPARQL endpoint

SPARQL Endpoint interface to Python

SPARQLWrapper is a simple Python wrapper around a SPARQL service to remotelly execute your queries. It helps in creating the query invokation and, possibly, convert the result into a more manageable format.

Installation

From PyPi:

$ pip install sparqlwrapper

From GitHub::

$ pip install git+https://github.com/rdflib/sparqlwrapper#egg=sparqlwrapper

From Debian

$ sudo apt-get install python-sparqlwrapper

Usage

Create an instance to execute your query (SELECT, ASK, CONSTRUCT, DESCRIBE):

from SPARQLWrapper import SPARQLWrapper, JSON

sparql = SPARQLWrapper("http://dbpedia.org/sparql")
sparql.setQuery("""
    PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
    SELECT ?label
    WHERE { <http://dbpedia.org/resource/Asturias> rdfs:label ?label }
""")
sparql.setReturnFormat(JSON)
results = sparql.query().convert()

for result in results["results"]["bindings"]:
    print('%s: %s' % (result["label"]["xml:lang"], result["label"]["value"]))

from SPARQLWrapper import SPARQLWrapper, XML

sparql = SPARQLWrapper("http://dbpedia.org/sparql")
sparql.setQuery("""
    ASK WHERE { 
        <http://dbpedia.org/resource/Asturias> rdfs:label "Asturias"@es
    }    
""")
sparql.setReturnFormat(XML)
results = sparql.query().convert()
print results.toxml()

from SPARQLWrapper import SPARQLWrapper, RDFXML
from rdflib import Graph

sparql = SPARQLWrapper("http://dbpedia.org/sparql")

sparql.setQuery("""
    PREFIX dbo: <http://dbpedia.org/ontology/>
    PREFIX schema: <http://schema.org/>
    
    CONSTRUCT {
      ?lang a schema:Language ;
      schema:alternateName ?iso6391Code . 
    }
    WHERE {
      ?lang a dbo:Language ;
      dbo:iso6391Code ?iso6391Code .
      FILTER (STRLEN(?iso6391Code)=2) # to filter out non-valid values
    }
""")

sparql.setReturnFormat(RDFXML)
results = sparql.query().convert()
print(results.serialize(format='xml'))

from SPARQLWrapper import SPARQLWrapper, N3
from rdflib import Graph

sparql = SPARQLWrapper("http://dbpedia.org/sparql")

sparql.setQuery("""
    DESCRIBE <http://dbpedia.org/resource/Asturias>
""")

sparql.setReturnFormat(N3)
results = sparql.query().convert()
g = Graph()
g.parse(data=results, format="n3")
print(g.serialize(format='n3'))

from SPARQLWrapper import SPARQLWrapper, POST, DIGEST

sparql = SPARQLWrapper("https://example.org/sparql-auth")

sparql.setHTTPAuth(DIGEST)
sparql.setCredentials("login", "password")
sparql.setMethod(POST)

sparql.setQuery("""
WITH <http://example.graph>
DELETE
{ <http://dbpedia.org/resource/Asturias> rdfs:label "Asturies"@ast }
""")

results = sparql.query()
print results.response.read()

There is also a SPARQLWrapper2 class that works with JSON SELECT results only and wraps the results to make processing of average queries a bit simpler.

from SPARQLWrapper import SPARQLWrapper2

sparql = SPARQLWrapper2("http://dbpedia.org/sparql")
sparql.setQuery("""
    PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
    SELECT ?label
    WHERE { <http://dbpedia.org/resource/Asturias> rdfs:label ?label }
""")

for result in sparql.query().bindings:
    print('%s: %s' % (result["label"].lang, result["label"].value))

Source code

The source distribution contains:

• SPARQLWrapper: the Python library. You should copy the directory somewhere into your PYTHONPATH. Alternatively, you can also run the distutils scripts:

  python setup.py install

• test: some unit and integrations tests

• script: some scripts to run the library against some SPARQL endpoints.

Documentation

The SPARQLWrapper documentation is available online at https://rdflib.github.io/sparqlwrapper/doc/latest/.

License

The package is licensed under W3C license.