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from rdflib import *
ex = Namespace('http://ex.co/')
g = Graph()
g.namespace_manager.bind('', ex)
g.add((ex.s1, ex.p, ex.o1))
g.add((ex.s1, ex.p, ex.o2))
g.add((ex.s1, ex.p, ex.o3))
g.add((ex.s2, ex.p, ex.o2))
g.add((ex.s2, ex.p, ex.o3))
g.add((ex.s2, ex.p, ex.o4))
g.add((ex.s2, ex.p, ex.o5))
g.add((ex.s3, ex.p, ex.o1))
g.add((ex.s3, ex.p, ex.o3))
g.add((ex.s3, ex.p, ex.o5))
print(g.serialize(format="n3"))
# should be
# :s1 :p :o1, :o2, :o3 .
# :s2 :p :o2, :o3, :o4, :o5 .
# :s3 :p :o1, :o3, :o5 .
print '---'
print(g.query("""
PREFIX : <http://ex.co/>
SELECT ?o ?new
WHERE {
:s1 :p ?o .
:s2 :p ?o .
OPTIONAL {
:s3 :p ?o .
BIND(:s4 as ?new)
}
}
""").serialize(format="csv"))
# should be
# :o2 ,
# :o3 , :s4
print '---'
g.update("""
PREFIX : <http://ex.co/>
DELETE { :s1 :p ?o }
INSERT { ?new :p ?o }
WHERE {
:s1 :p ?o .
:s2 :p ?o .
OPTIONAL {
:s3 :p ?o .
BIND(:s4 as ?new)
}
}
""")
print(g.serialize(format="n3"))
# should now be
# :s1 :p :o1 .
# :s2 :p :o2, :o3, :o4, :o5 .
# :s3 :p :o1, :o3, :o5 .
# :s4 :p :o3 .
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