Remove 'format=' parameter from graph parse() and serialize() calls

rdflib 6.0.0 improved filename-based format recognition.  (Tests for
recognition were upgraded to support JSON-LD in PR 1408.)

This patch removes explicit-but-redundant functionality.

References:
* RDFLib/rdflib#1408

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

case_utils/case_sparql_construct/__init__.py

@@ -41,7 +41,7 @@ def main():
 
     in_graph = rdflib.Graph()
     for in_graph_filename in args.in_graph:
-        in_graph.parse(in_graph_filename, format=case_utils.guess_format(in_graph_filename))
+        in_graph.parse(in_graph_filename)
         _logger.debug("len(in_graph) = %d.", len(in_graph))
 
     out_graph = rdflib.Graph()

case_utils/case_sparql_select/__init__.py

@@ -55,7 +55,7 @@ def main():
 
     graph = rdflib.Graph()
     for in_graph_filename in args.in_graph:
-        graph.parse(in_graph_filename, format=case_utils.guess_format(in_graph_filename))
+        graph.parse(in_graph_filename)
 
     # Inherit prefixes defined in input context dictionary.
     nsdict = {k:v for (k,v) in graph.namespace_manager.namespaces()}

tests/case_file/test_case_file.py

@@ -39,7 +39,7 @@
 
 def load_graph(filename):
     in_graph = rdflib.Graph()
-    in_graph.parse(filename, format=rdflib.util.guess_format(filename))
+    in_graph.parse(filename)
     return in_graph
 
 @pytest.fixture

tests/case_sparql_construct/test_case_sparql_construct.py

@@ -23,7 +23,7 @@ def _test_templates_with_blank_nodes_result(filename):
     ground_truth_negative = set()
 
     graph = rdflib.Graph()
-    graph.parse(filename, format=case_utils.guess_format(filename))
+    graph.parse(filename)
 
     computed = set()
     query_string = """\

tests/src/glom_graph.py

@@ -24,8 +24,8 @@
 def main():
     g = rdflib.Graph()
     for in_graph in args.in_graph:
-        g.parse(in_graph, format=case_utils.guess_format(in_graph))
-    g.serialize(args.out_graph, format=case_utils.guess_format(args.out_graph))
+        g.parse(in_graph)
+    g.serialize(args.out_graph)
 
 if __name__ == "__main__":
     import argparse

tests/src/isomorphic_diff.py

@@ -52,8 +52,8 @@ def main():
     g1 = rdflib.Graph()
     g2 = rdflib.Graph()
 
-    g1.parse(args.in_graph_1, format=case_utils.guess_format(args.in_graph_1))
-    g2.parse(args.in_graph_2, format=case_utils.guess_format(args.in_graph_2))
+    g1.parse(args.in_graph_1)
+    g2.parse(args.in_graph_2)
 
     #_logger.debug("type(g1) = %r.", type(g1))
     #_logger.debug("type(g2) = %r.", type(g2))