style: fix/ignore flake8 errors in rdflib/plugins/sparql/ (#1964)

These will eventually come up once `flakeheaven` baseline expires.

The actual problems should be fixed in conjunction with tests.

Only fixes are related to unused imports.

rdflib/plugins/sparql/__init__.py

@@ -4,6 +4,8 @@
 .. versionadded:: 4.0
 """
 
+import sys
+from typing import TYPE_CHECKING
 
 SPARQL_LOAD_GRAPHS = True
 """
@@ -30,11 +32,9 @@
 
 PLUGIN_ENTRY_POINT = "rdf.plugins.sparqleval"
 
-import sys
-from typing import TYPE_CHECKING, Any
 
-from . import operators, parser, parserutils
-from .processor import prepareQuery, prepareUpdate, processUpdate
+from . import operators, parser, parserutils  # noqa: E402
+from .processor import prepareQuery, prepareUpdate, processUpdate  # noqa: F401, E402
 
 assert parser
 assert operators

rdflib/plugins/sparql/algebra.py

@@ -129,9 +129,9 @@ def _addvar(term, varsknown):
     return [x[1] for x in l_]
 
 
-def triples(l):
+def triples(l):  # noqa: E741
 
-    l = reduce(lambda x, y: x + y, l)
+    l = reduce(lambda x, y: x + y, l)  # noqa: E741
     if (len(l) % 3) != 0:
         raise Exception("these aint triples")
     return reorderTriples((l[x], l[x + 1], l[x + 2]) for x in range(0, len(l), 3))
@@ -322,7 +322,7 @@ def translateGroupGraphPattern(graphPattern):
     return G
 
 
-class StopTraversal(Exception):
+class StopTraversal(Exception):  # noqa: N818
     def __init__(self, rv):
         self.rv = rv
 
@@ -794,7 +794,7 @@ def translateQuery(q, base=None, initNs=None):
     return Query(prologue, res)
 
 
-class ExpressionNotCoveredException(Exception):
+class ExpressionNotCoveredException(Exception):  # noqa: N818
     pass
 
 
@@ -1112,7 +1112,7 @@ def sparql_query_text(node):
             elif node.name == "MultiplicativeExpression":
                 left_side = convert_node_arg(node.expr)
                 multiplication = left_side
-                for i, operator in enumerate(node.op):
+                for i, operator in enumerate(node.op):  # noqa: F402
                     multiplication += (
                         operator + " " + convert_node_arg(node.other[i]) + " "
                     )

rdflib/plugins/sparql/datatypes.py

@@ -29,7 +29,7 @@
     )
 )
 
-### adding dateTime datatypes
+# adding dateTime datatypes
 
 XSD_DateTime_DTs = set((XSD.dateTime, XSD.date, XSD.time))
 

rdflib/plugins/sparql/evaluate.py

@@ -28,19 +28,16 @@
 from rdflib.plugins.sparql import CUSTOM_EVALS, parser
 from rdflib.plugins.sparql.aggregates import Aggregator
 from rdflib.plugins.sparql.evalutils import (
-    _diff,
     _ebv,
     _eval,
     _fillTemplate,
-    _filter,
     _join,
     _minus,
     _val,
 )
 from rdflib.plugins.sparql.parserutils import CompValue, value
 from rdflib.plugins.sparql.sparql import (
     AlreadyBound,
-    Bindings,
     FrozenBindings,
     FrozenDict,
     Query,

rdflib/plugins/sparql/evalutils.py

@@ -53,7 +53,7 @@ def _ebv(expr, ctx):
     elif isinstance(expr, Variable):
         try:
             return EBV(ctx[expr])
-        except:
+        except:  # noqa: E722
             return False
     return False
 

rdflib/plugins/sparql/operators.py

@@ -65,7 +65,7 @@ def Builtin_isNUMERIC(expr, ctx):
     try:
         numeric(expr.arg)
         return Literal(True)
-    except:
+    except:  # noqa: E722
         return Literal(False)
 
 
@@ -669,15 +669,15 @@ def default_cast(e, ctx):
     if not isinstance(x, Literal):
         raise SPARQLError("Can only cast Literals to non-string data-types")
 
-    if x.datatype and not x.datatype in XSD_DTs:
+    if x.datatype and not x.datatype in XSD_DTs:  # noqa: E713
         raise SPARQLError("Cannot cast literal with unknown datatype: %r" % x.datatype)
 
     if e.iri == XSD.dateTime:
         if x.datatype and x.datatype not in (XSD.dateTime, XSD.string):
             raise SPARQLError("Cannot cast %r to XSD:dateTime" % x.datatype)
         try:
             return Literal(isodate.parse_datetime(x), datatype=e.iri)
-        except:
+        except:  # noqa: E722
             raise SPARQLError("Cannot interpret '%r' as datetime" % x)
 
     if x.datatype == XSD.dateTime:
@@ -686,21 +686,21 @@ def default_cast(e, ctx):
     if e.iri in (XSD.float, XSD.double):
         try:
             return Literal(float(x), datatype=e.iri)
-        except:
+        except:  # noqa: E722
             raise SPARQLError("Cannot interpret '%r' as float" % x)
 
     elif e.iri == XSD.decimal:
         if "e" in x or "E" in x:  # SPARQL/XSD does not allow exponents in decimals
             raise SPARQLError("Cannot interpret '%r' as decimal" % x)
         try:
             return Literal(Decimal(x), datatype=e.iri)
-        except:
+        except:  # noqa: E722
             raise SPARQLError("Cannot interpret '%r' as decimal" % x)
 
     elif e.iri == XSD.integer:
         try:
             return Literal(int(x), datatype=XSD.integer)
-        except:
+        except:  # noqa: E722
             raise SPARQLError("Cannot interpret '%r' as int" % x)
 
     elif e.iri == XSD.boolean:

rdflib/plugins/sparql/parser.py

@@ -15,7 +15,6 @@
     Literal,
     OneOrMore,
     Optional,
-    ParseException,
     ParseResults,
     Regex,
     Suppress,
@@ -95,7 +94,7 @@ def expandTriples(terms):
         #       "Length of triple-list is not divisible by 3: %d!"%len(res)
 
         # return [tuple(res[i:i+3]) for i in range(len(res)/3)]
-    except:
+    except:  # noqa: E722
         if DEBUG:
             import traceback
 
@@ -1528,7 +1527,7 @@ def expandUnicodeEscapes(q):
     def expand(m):
         try:
             return chr(int(m.group(1), 16))
-        except:
+        except:  # noqa: E722
             raise Exception("Invalid unicode code point: " + m)
 
     return expandUnicodeEscapes_re.sub(expand, q)

rdflib/plugins/sparql/parserutils.py

@@ -270,4 +270,4 @@ def prettify_parsetree(t, indent="", depth=0):
 
 
 # hurrah for circular imports
-from rdflib.plugins.sparql.sparql import NotBoundError, SPARQLError
+from rdflib.plugins.sparql.sparql import NotBoundError, SPARQLError  # noqa: E402

rdflib/plugins/sparql/results/jsonresults.py

@@ -1,5 +1,5 @@
 import json
-from typing import IO, Any, Dict, Optional, TextIO, Union
+from typing import IO, Any, Dict
 
 from rdflib import BNode, Literal, URIRef, Variable
 from rdflib.query import Result, ResultException, ResultParser, ResultSerializer

rdflib/plugins/sparql/results/tsvresults.py

@@ -11,7 +11,6 @@
     LineEnd,
     Literal,
     Optional,
-    ParseException,
     ParserElement,
     Suppress,
     ZeroOrMore,

rdflib/plugins/sparql/sparql.py

@@ -24,7 +24,7 @@ def __init__(self, msg: Optional[str] = None):
         SPARQLError.__init__(self, msg)
 
 
-class AlreadyBound(SPARQLError):
+class AlreadyBound(SPARQLError):  # noqa: N818
     """Raised when trying to bind a variable that is already bound!"""
 
     def __init__(self):
@@ -415,7 +415,7 @@ def absolutize(
                 return Literal(
                     iri.string, lang=iri.lang, datatype=self.absolutize(iri.datatype)  # type: ignore[arg-type]
                 )
-        elif isinstance(iri, URIRef) and not ":" in iri:
+        elif isinstance(iri, URIRef) and not ":" in iri:  # noqa: E713
             return URIRef(iri, base=self.base)
 
         return iri

rdflib/plugins/sparql/update.py

@@ -305,6 +305,6 @@ def evalUpdate(graph, update, initBindings={}):
                 evalModify(ctx, u)
             else:
                 raise Exception("Unknown update operation: %s" % (u,))
-        except:
+        except:  # noqa: E722
             if not u.silent:
                 raise