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"""
SPARQL Queries be prepared (i.e parsed and translated to SPARQL algebra)
by the [`prepareQuery`][rdflib.plugins.sparql.prepareQuery] method.
`initNs` can be used instead of PREFIX values.
When executing, variables can be bound with the
`initBindings` keyword parameter.
"""
from pathlib import Path
import rdflib
from rdflib.namespace import FOAF
from rdflib.plugins.sparql import prepareQuery
EXAMPLES_DIR = Path(__file__).parent
if __name__ == "__main__":
q = prepareQuery(
"SELECT ?name WHERE { ?person foaf:knows/foaf:name ?name . }",
initNs={"foaf": FOAF},
)
g = rdflib.Graph()
g.parse(f"{EXAMPLES_DIR / 'foaf.n3'}")
tim = rdflib.URIRef("http://www.w3.org/People/Berners-Lee/card#i")
for row in g.query(q, initBindings={"person": tim}):
# For select queries, the Result object is an iterable of ResultRow
# objects.
assert isinstance(row, rdflib.query.ResultRow)
print(row.name)
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