4.6.0 and later break TensorFlow 2.12.0 with Python 3.8

[stewartmiles]

It's possible TensorFlow is doing something wrong or typing_extensions is at fault 🤷🏽

dfe4889 appears to be the culprit.

Here's a way to reproduce after installing TensorFlow 2.12.0

from tensorflow.python.trackable import data_structures
from tensorflow.python.types import trace

standard_dict = {'foo': 'bar'}
wrapped_dict = data_structures._DictWrapper(standard_dict)

# Prints False
print(isinstance(standard_dict, trace.SupportsTracingProtocol))

# The following line throws "TypeError: this __dict__ descriptor does not support '_DictWrapper' objects"
print(isinstance(wrapped_dict, trace.SupportsTracingProtocol))

i.e, running the above spits out the following:

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    print(isinstance(wrapped_dict, trace.SupportsTracingProtocol))
  File "/home/xxx/src/.venv/lib/python3.8/site-packages/typing_extensions.py", line 605, in __instancecheck__
    val = inspect.getattr_static(instance, attr)
  File "/usr/lib/python3.8/inspect.py", line 1596, in getattr_static
    instance_result = _check_instance(obj, attr)
  File "/usr/lib/python3.8/inspect.py", line 1543, in _check_instance
    instance_dict = object.__getattribute__(obj, "__dict__")
TypeError: this __dict__ descriptor does not support '_DictWrapper' objects

[stewartmiles]

Oh ok it looks like folks are tracking this on the TensorFlow repo tensorflow/tensorflow#60687 it appears to be an issue with TensorFlow.

[AlexWaygood]

Looks to me like it's probably an issue with wrapt rather than typing_extensions or TensorFlow, actually. We discussed this a bit in python/cpython#105134.

Wrapt raises TypeError if you do object.__getattribute__(<some_wrapt_ObjectProxy_instance, '__dict__'). I know of no way to construct a class using pure Python that has this behaviour (wrapt achieves this behaviour by using a C extension), and it breaks some fundamental assumptions that the stdlib function inspect.getattr_static makes. That, in turn, breaks typing_extensions.