New submission from Zac Hatfield-Dodds <[email protected]>:
Consider the following snippet, which passes on Python 3.9 and earlier:
import inspect
def f(x: int = None):
pass
print(inspect.signature(constructor))
assert inspect.signature(constructor).parameters["a"].annotation == int
But under Python 3.10 (alpha 4), the annotation is instead read as
Optional[int]. This is correct for typing.get_type_hints(), but *not* for
inspect.signature().
I therefore suspect that this is an accidental side-effect from support for
PEP-563 deferred evaluation of annotations.
----------
components: Library (Lib)
messages: 385524
nosy: Zac Hatfield-Dodds
priority: normal
severity: normal
status: open
title: Changed behaviour of inspect.signature() in Python 3.10
versions: Python 3.10
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Python tracker <[email protected]>
<https://bugs.python.org/issue43006>
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