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[3.12] gh-105080: Fixed inconsistent signature on derived classes (GH-105217) (#105257)

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gh-105080: Fixed inconsistent signature on derived classes (GH-105217)
(cherry picked from commit 9ad199ba36)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>
This commit is contained in:
Miss Islington (bot) 2023-06-02 16:05:49 -07:00 • committed by GitHub
parent 72d5dfaa8f
commit d3922c4688
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 31 additions and 11 deletions
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23
Lib/inspect.py
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@ -2581,17 +2581,18 @@ def _signature_from_callable(obj, *,
factory_method = None
new = _signature_get_user_defined_method(obj, '__new__')
init = _signature_get_user_defined_method(obj, '__init__')
# Now we check if the 'obj' class has an own '__new__' method
if '__new__' in obj.__dict__:
factory_method = new
# or an own '__init__' method
elif '__init__' in obj.__dict__:
factory_method = init
# If not, we take inherited '__new__' or '__init__', if present
elif new is not None:
factory_method = new
elif init is not None:
factory_method = init
# Go through the MRO and see if any class has user-defined
# pure Python __new__ or __init__ method
for base in obj.__mro__:
# Now we check if the 'obj' class has an own '__new__' method
if new is not None and '__new__' in base.__dict__:
factory_method = new
break
# or an own '__init__' method
elif init is not None and '__init__' in base.__dict__:
factory_method = init
break
if factory_method is not None:
sig = _get_signature_of(factory_method)