Support PathLike save targets

namespace.py

@@ -17,7 +17,7 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import importlib, urllib.request, urllib.parse
+import importlib, os, urllib.request, urllib.parse
 
 from owlready2.base import *
 from owlready2.base import _universal_abbrev_2_iri, _universal_iri_2_abbrev, _universal_abbrev_2_datatype, _universal_datatype_2_abbrev
@@ -481,7 +481,7 @@ def new_blank_node(self): return self.graph.new_blank_node()
   def save(self, file = None, format = "rdfxml", **kargs):
     if   file is None:
       self.graph.commit()
-    elif isinstance(file, str):
+    elif isinstance(file, (str, os.PathLike)):
       if _LOG_LEVEL: print("* Owlready2 * Saving world %s to %s..." % (self, file), file = sys.stderr)
       file = open(file, "wb")
       self.graph.save(file, format, **kargs)
@@ -870,7 +870,7 @@ def save(self, file = None, format = "rdfxml", **kargs):
       if _LOG_LEVEL: print("* Owlready2 * Saving ontology %s to %s..." % (self.name, getattr(file, "name", "???")), file = sys.stderr)
       self.graph.save(file, format, **kargs)
       file.close()
-    elif isinstance(file, str):
+    elif isinstance(file, (str, os.PathLike)):
       if _LOG_LEVEL: print("* Owlready2 * Saving ontology %s to %s..." % (self.name, file), file = sys.stderr)
       file = open(file, "wb")
       self.graph.save(file, format, **kargs)

test/regtest.py

@@ -323,6 +323,33 @@ def test_world_10(self):
     sql = db.cursor()
     sql.execute("""SELECT * from ontologies;""")
     assert sql.fetchall() == []
+
+  def test_world_save_pathlike(self):
+    import pathlib
+
+    filename = pathlib.Path(self.new_tmp_file())
+    world = self.new_world()
+    onto = world.get_ontology("http://test.org/pathlib_world.owl")
+
+    with onto:
+      class C(Thing): pass
+
+    world.save(file = filename, format = "ntriples")
+
+    assert filename.stat().st_size > 0
+
+  def test_ontology_save_pathlike(self):
+    import pathlib
+
+    filename = pathlib.Path(self.new_tmp_file())
+    onto = self.new_ontology()
+
+    with onto:
+      class C(Thing): pass
+
+    onto.save(file = filename, format = "ntriples")
+
+    assert filename.stat().st_size > 0
 
 
   def test_ontology_1(self):