refactor: narrow imports

This change narrows import so that things are imported from the Python module
where they are defined instead of importing them from a module that re-exports
them, e.g. change import of `Graph` to import from the `rdflib.graph` module
instead of from the `rdflib` module. This helps avoid problems with circular
imports.

Author: aucampia

rdflib/extras/infixowl.py

@@ -110,11 +110,10 @@
 import itertools
 import logging
 
-from rdflib import OWL, RDF, RDFS, XSD, BNode, Literal, Namespace, URIRef, Variable
 from rdflib.collection import Collection
 from rdflib.graph import Graph
-from rdflib.namespace import NamespaceManager
-from rdflib.term import Identifier
+from rdflib.namespace import OWL, RDF, RDFS, XSD, Namespace, NamespaceManager
+from rdflib.term import BNode, Identifier, Literal, URIRef, Variable
 from rdflib.util import first
 
 logger = logging.getLogger(__name__)

rdflib/plugins/sparql/parserutils.py

@@ -16,8 +16,7 @@
 
 from pyparsing import ParseResults, TokenConverter, originalTextFor
 
-from rdflib import BNode, Variable
-from rdflib.term import Identifier
+from rdflib.term import BNode, Identifier, Variable
 
 if TYPE_CHECKING:
     from rdflib.plugins.sparql.sparql import FrozenBindings

rdflib/void.py

@@ -1,7 +1,8 @@
 import collections
 
-from rdflib import Graph, Literal, URIRef
+from rdflib.graph import Graph
 from rdflib.namespace import RDF, VOID
+from rdflib.term import Literal, URIRef
 
 
 def generateVoID(  # noqa: N802