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"""
RDFLib Graphs (and Resources) can be "sliced" with [] syntax
This is a short-hand for iterating over triples.
Combined with SPARQL paths (see `foafpaths.py`) - quite complex queries
can be realised.
See [`Graph.__getitem__`][rdflib.graph.Graph.__getitem__] for details
"""
from pathlib import Path
from rdflib import RDF, Graph
from rdflib.namespace import FOAF
EXAMPLES_DIR = Path(__file__).parent
if __name__ == "__main__":
graph = Graph()
graph.parse(f"{EXAMPLES_DIR / 'foaf.n3'}", format="n3")
for person in graph[: RDF.type : FOAF.Person]: # type: ignore[misc]
friends = list(graph[person : FOAF.knows * "+" / FOAF.name]) # type: ignore[operator]
if friends:
print(f"{graph.value(person, FOAF.name)}'s circle of friends:")
for name in friends:
print(name)
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