New submission from Joseph Perez <[email protected]>:
`typing.get_type_hints` gives a different result for a wrapper created with
`functools.wraps` in case of inferred `Optional` arguments (when the default
value of the argument is None)
```python
from functools import wraps
from typing import get_type_hints
def foo(bar: int = None): ...
@wraps(foo)
def foo2(*args, **kwargs): ...
print(get_type_hints(foo)) # {'bar': typing.Optional[int]}
print(get_type_hints(foo2)) # {'bar': <class 'int'>}
```
This is because `get_type_hints` use the defauts of the wrapper (`foo2`) and
not those of the wrapped function (`foo`).
This is not consistent with some other tools like `inspect.signature` which
gives the same signature (and thus same default argument) for the wrapped
function and its wrapper.
I think this case has simply been forgotten in the resolution of
https://bugs.python.org/issue37838 (fixing `get_type_hints` not taking `wraps`
in account at all), because inferred `Optional` is a kind deprecated feature
(https://github.com/python/typing/issues/275).
----------
messages: 385005
nosy: joperez
priority: normal
severity: normal
status: open
title: Inferred Optional type of wrapper function arguments
type: behavior
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue42921>
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