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gh-127750: Restore inspect and pydoc support of singledispatchmethod (GH-130309)

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The code is still flawed, because it does not recognize class and static
methods, and the first argument is not removed from the signature of
bound methods, but at least it does not worse than in 3.13 and older.
This commit is contained in:
Serhiy Storchaka 2025-02-20 11:08:49 +02:00 • committed by GitHub
parent ed831b95a2
commit 10b32054ad
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4 changed files with 79 additions and 1 deletions
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52
Lib/test/test_functools.py
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@ -3309,6 +3309,58 @@ class TestSingleDispatch(unittest.TestCase):
support.gc_collect()
self.assertIsNone(r())
def test_signatures(self):
@functools.singledispatch
def func(item, arg: int) -> str:
return str(item)
@func.register
def _(item: int, arg: bytes) -> str:
return str(item)
self.assertEqual(str(Signature.from_callable(func)),
'(item, arg: int) -> str')
def test_method_signatures(self):
class A:
def m(self, item, arg: int) -> str:
return str(item)
@classmethod
def cm(cls, item, arg: int) -> str:
return str(item)
@functools.singledispatchmethod
def func(self, item, arg: int) -> str:
return str(item)
@func.register
def _(self, item, arg: bytes) -> str:
return str(item)
@functools.singledispatchmethod
@classmethod
def cls_func(cls, item, arg: int) -> str:
return str(arg)
@func.register
@classmethod
def _(cls, item, arg: bytes) -> str:
return str(item)
@functools.singledispatchmethod
@staticmethod
def static_func(item, arg: int) -> str:
return str(arg)
@func.register
@staticmethod
def _(item, arg: bytes) -> str:
return str(item)
self.assertEqual(str(Signature.from_callable(A.func)),
'(self, item, arg: int) -> str')
self.assertEqual(str(Signature.from_callable(A().func)),
'(self, item, arg: int) -> str')
self.assertEqual(str(Signature.from_callable(A.cls_func)),
'(cls, item, arg: int) -> str')
self.assertEqual(str(Signature.from_callable(A.static_func)),
'(item, arg: int) -> str')
class CachedCostItem:
_cost = 1