RDFLib

From GetSemantic

RDFLib is an RDF library written in the Python programming language.

1 Documentation
2 See Also

[edit] Documentation

[edit] Loading a graph

import rdflib
graph = rdflib.ConjunctiveGraph()
graph.parse("test.rdf")

See ConjunctiveGraph and ConjunctiveGraph.parse()

[edit] Iterating through the graph

Following on from previous sample:

for s, p, o in graph:
  print "Subject = " + s
  print "Predicate = " + p
  print "Object = " + o

See Graph.__iter__

[edit] Querying a graph using SPARQL

Following on from previous samples:

results = graph.query("PREFIX foaf: <http://xmlns.com/foaf/0.1/> \
SELECT ?friend ?name WHERE { <http://tommorris.org/foaf#me> foaf:knows ?friend . ?friend foaf:name ?name . }")
for i in results.selected:
  print str(i[1]) # prints friends name, since 'name' is the second variable in the SELECT

See Graph.query()

Currently RDFLib supports only SELECT and ASK queries, although CONSTRUCT and DESCRIBE queries are slated for future versions.

[edit] Adding a statement to a graph

import rdflib
graph = rdflib.ConjunctiveQuery()
graph.add((rdflib.URIRef('http://example.org/subject'), rdflib.URIRef('http://example.org/predicate'), rdflib.Literal('Object!')))

See Graph.add()