Python 3.9 - TypeError: unsupported operand type(s) for |: 'TypeVar' and 'NoneType' #2023
Description
It seems onnxscript should be supported for Python 3.8+ but the | operator for type annotation was only added in Python 3.10 but still widely used in the repository. So onnxscript may not really work for Python < 3.10. Is that correct?
I started seeing this error in onnxscript==0.1.0.dev20250120 with Python 3.9 (3.10+ works fine) which was not the case in onnxscript==0.1.0.dev20250118 when doing torch.onnx.dynamo_export with torch==2.5.1.
torch.onnx.dynamo_export(
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/torch/onnx/__init__.py:517: in dynamo_export
return dynamo_export(
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/torch/onnx/_internal/_exporter_legacy.py:1206: in dynamo_export
else ResolvedExportOptions(export_options, model=model)
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/torch/onnx/_internal/_exporter_legacy.py:360: in __init__
self.onnx_registry = resolve(options.onnx_registry, OnnxRegistry())
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/torch/onnx/_internal/_exporter_legacy.py:121: in __init__
self._initiate_registry_from_torchlib()
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/torch/onnx/_internal/_exporter_legacy.py:139: in _initiate_registry_from_torchlib
for meta in onnxscript_apis.get_torchlib_ops():
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/onnxscript/_framework_apis/torch_2_5.py:119: in get_torchlib_ops
domain=overload_func.function_ir.domain,
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/onnxscript/values.py:657: in function_ir
return converter.translate_function_signature(func_ast)
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/onnxscript/converter.py:1470: in translate_function_signature
return self._translate_function_signature_common(fn)
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/onnxscript/converter.py:1397: in _translate_function_signature_common
typeinfo = self._eval_constant_expr(x.annotation)
/tmp/-modelopt-tox/py39-torch25-unit/lib/python3.9/site-packages/onnxscript/converter.py:467: in _eval_constant_expr
return eval(cpl, self.globals, locals) # pylint: disable=eval-used
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> ???
E TypeError: unsupported operand type(s) for |: 'TypeVar' and 'NoneType'
<ast>:2: TypeError