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slice

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__ for details

Attributes:

EXAMPLES_DIR module-attribute 

EXAMPLES_DIR = parent

friends module-attribute 

friends = list(graph[person:(knows * '+' / name)])

graph module-attribute 

graph = Graph()

show_source: false show_docstring_attributes: false show_docstring_functions: false show_docstring_modules: false show_docstring_classes: false show_signature: false show_signature_annotations: false show_signature_type_parameters: false show_docstring_other_parameters: false show_docstring_parameters: false show_docstring_raises: false show_docstring_receives: false show_docstring_returns: false summary: false show_if_no_docstring: false

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)