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gh-100039: enhance __signature__ to work with str and callables (GH-100168)

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Callables should be either class- or static-methods.
Enum now uses the classmethod version to greatly improve the help
given for enums and flags.
This commit is contained in:
Ethan Furman 2022-12-16 12:30:47 -08:00 • committed by GitHub
parent 5234e1cbea
commit a5a7cea202
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5 changed files with 73 additions and 4 deletions
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10
Lib/inspect.py
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@ -2443,10 +2443,18 @@ def _signature_from_callable(obj, *,
pass
else:
if sig is not None:
# since __text_signature__ is not writable on classes, __signature__
# may contain text (or be a callable that returns text);
# if so, convert it
o_sig = sig
if not isinstance(sig, (Signature, str)) and callable(sig):
sig = sig()
if isinstance(sig, str):
sig = _signature_fromstr(sigcls, obj, sig)
if not isinstance(sig, Signature):
raise TypeError(
'unexpected object {!r} in __signature__ '
'attribute'.format(sig))
'attribute'.format(o_sig))
return sig
try: