Start using pathlib.Path instead of all the os.path functions

jedi/inference/__init__.py

@@ -178,6 +178,8 @@ class InferenceState(object):
 
     def parse_and_get_code(self, code=None, path=None,
                            use_latest_grammar=False, file_io=None, **kwargs):
+        if path is not None:
+            path = str(path)
         if code is None:
             if file_io is None:
                 file_io = FileIO(path)