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TypeError from inspect.type_info with unhashable Annotated metadata #565
Description
Description
MCVE
from typing import Annotated
import msgspec
class Test(msgspec.Struct):
a: Annotated[int, {"unhashable": "metadata"}]
t = Test(a=1)
print(t.a) # 1 (no runtime issues)
msgspec.inspect.type_info(Test) # TypeError: unhashable type: 'dict'
Error
Traceback (most recent call last):
File "/home/peter/PycharmProjects/msgspec-mcve/main.py", line 14, in <module>
msgspec.inspect.type_info(Test)
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 614, in type_info
return multi_type_info([type])[0]
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 580, in multi_type_info
return _Translator(types).run()
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 721, in run
return tuple(self.translate(t) for t in self.types)
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 721, in <genexpr>
return tuple(self.translate(t) for t in self.types)
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 755, in translate
out = self._translate_inner(t, args, **constrs)
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 903, in _translate_inner
type=self.translate(hints[name]),
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 724, in translate
t, args, metadata = _origin_args_metadata(typ)
File "/home/peter/PycharmProjects/msgspec-mcve/venv/lib/python3.10/site-packages/msgspec/inspect.py", line 622, in _origin_args_metadata
origin = _CONCRETE_TYPES.get(t)
File "/usr/lib/python3.10/typing.py", line 1651, in __hash__
return hash((self.__origin__, self.__metadata__))
TypeError: unhashable type: 'dict'
There doesn't seem to be any hard requirement that type metadata via Annotated must be hashable (searching for "hash" in pep 593 doesn't yield anything), however, the implementation of _AnnotatedAlias.__hash__() does hash any metadata as well as the origin type (ref):
def __hash__(self):
return hash((self.__origin__, self.__metadata__))
Activity
Handle where `Annotated` has unhashable metadata.
Handle where `Annotated` has unhashable metadata.