More compatibility fixes for typing.Generic:

* types.new_class is required in some distributions
 * avoid calling `isinstance` on some function objects in python 3.6
 * account for some strange zombie pointer issue on windows
Required for #40132.

PiperOrigin-RevId: 316735720
Change-Id: I1b08ef5f18c77c9343d587562f50632336b684d5

tensorflow/python/framework/test_util.py

@@ -736,7 +736,7 @@ def assert_no_new_tensors(f):
         return isinstance(obj,
                           (ops.Tensor, variables.Variable,
                            tensor_shape.Dimension, tensor_shape.TensorShape))
-      except ReferenceError:
+      except (ReferenceError, AttributeError):
         # If the object no longer exists, we don't care about it.
         return False
 

tensorflow/python/util/tf_should_use.py

@@ -21,15 +21,12 @@ import copy
 import sys
 import textwrap
 import traceback
-
-import six  # pylint: disable=unused-import
-
+import types
 
 from tensorflow.python.eager import context
 from tensorflow.python.framework import ops
 from tensorflow.python.platform import tf_logging
 from tensorflow.python.util import tf_decorator
-# pylint: enable=g-bad-import-order,g-import-not-at-top
 
 
 class _TFShouldUseHelper(object):
@@ -154,7 +151,18 @@ def _get_wrapper(x, tf_should_use_helper):
   tx = copy.deepcopy(type_x)
   # Prefer using __orig_bases__, which preserve generic type arguments.
   bases = getattr(tx, '__orig_bases__', tx.__bases__)
+
+  # Use types.new_class when available, which is preferred over plain type in
+  # some distributions.
+  if sys.version_info >= (3, 5):
+    def set_body(ns):
+      ns.update(tx.__dict__)
+      return ns
+
+    copy_tx = types.new_class(tx.__name__, bases, exec_body=set_body)
+  else:
     copy_tx = type(tx.__name__, bases, dict(tx.__dict__))
+
   copy_tx.__init__ = _new__init__
   copy_tx.__getattribute__ = _new__getattribute__
   copy_tx.mark_used = _new_mark_used