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bpo-40897:Give priority to using the current class constructor in inspect.signature (GH-27177) (#27189)

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Co-authored-by: Łukasz Langa <lukasz@langa.pl>
(cherry picked from commit 6aab5f9bf3)

Co-authored-by: Weipeng Hong <hongweichen8888@sina.com>
This commit is contained in:
Miss Islington (bot) 2021-07-16 06:25:57 -07:00 • committed by GitHub
parent c3007ab3c6
commit 948e39a866
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3 changed files with 59 additions and 8 deletions
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24
Lib/inspect.py
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@ -2471,15 +2471,23 @@ def _signature_from_callable(obj, *,
if call is not None:
sig = _get_signature_of(call)
else:
# Now we check if the 'obj' class has a '__new__' method
factory_method = None
new = _signature_get_user_defined_method(obj, '__new__')
if new is not None:
sig = _get_signature_of(new)
else:
# Finally, we should have at least __init__ implemented
init = _signature_get_user_defined_method(obj, '__init__')
if init is not None:
sig = _get_signature_of(init)
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
if factory_method is not None:
sig = _get_signature_of(factory_method)
if sig is None:
# At this point we know, that `obj` is a class, with no user-