Get rid of a few Python 2 things

jedi/inference/gradual/annotation.py

@@ -138,8 +138,7 @@ def _infer_param(function_value, param):
     """
     annotation = param.annotation
     if annotation is None:
-        # If no Python 3-style annotation, look for a Python 2-style comment
-        # annotation.
+        # If no Python 3-style annotation, look for a comment annotation.
         # Identify parameters to function in the same sequence as they would
         # appear in a type comment.
         all_params = [child for child in param.parent.children
@@ -204,7 +203,8 @@ def infer_return_types(function, arguments):
     all_annotations = py__annotations__(function.tree_node)
     annotation = all_annotations.get("return", None)
     if annotation is None:
-        # If there is no Python 3-type annotation, look for a Python 2-type annotation
+        # If there is no Python 3-type annotation, look for an annotation
+        # comment.
         node = function.tree_node
         comment = parser_utils.get_following_comment_same_line(node)
         if comment is None:

jedi/inference/gradual/typeshed.py

@@ -272,7 +272,7 @@ def _load_from_typeshed(inference_state, python_value_set, parent_module_value,
 def _try_to_load_stub_from_file(inference_state, python_value_set, file_io, import_names):
     try:
         stub_module_node = parse_stub_module(inference_state, file_io)
-    except OSError:  # IOError is Python 2 only
+    except OSError:
         # The file that you're looking for doesn't exist (anymore).
         return None
     else: