"See help(type(self)) for accurate signature" in `__init__`'s docstring is misleading

Feature or enhancement

Let's say I have a simple class:

class A:
    def __init__(self, a):
        self.a = a

help(A) will produce:

Help on class A in module __main__:

class A(builtins.object)
 |  A(a)
 |
 |  Methods defined here:
 |
 |  __init__(self, a)
 |      Initialize self.  See help(type(self)) for accurate signature.
 |
 |  ----------------------------------------------------------------------
 |  Data descriptors defined here:
 |
 |  __dict__
 |      dictionary for instance variables
 |
 |  __weakref__
 |      list of weak references to the object

Note that the signature is already accurate. But, now I see this message: See help(type(self)) for accurate signature.. Let's try to do something about it.

Let's follow the instruction:

class A:
    def __init__(self, a):
        help(type(self))
        self.a = a

It will produce:

Help on class A in module __main__:

class A(builtins.object)
 |  A(a)
 |
 |  Methods defined here:
 |
 |  __init__(self, a)
 |      Initialize self.  See help(type(self)) for accurate signature.
 |
 |  ----------------------------------------------------------------------
 |  Data descriptors defined here:
 |
 |  __dict__
 |      dictionary for instance variables
 |
 |  __weakref__
 |      list of weak references to the object

Exactly the same signature. With exactly the same message.

Now, let's try a different example, an empty class:

class B: ...

help(B.__init__) will say:

Help on wrapper_descriptor:

__init__(self, /, *args, **kwargs) unbound builtins.object method
    Initialize self.  See help(type(self)) for accurate signature.

And help(B) will say (notice that there would be no __init__ at all):

Help on class B in module __main__:

class B(builtins.object)
 |  Data descriptors defined here:
 |
 |  __dict__
 |      dictionary for instance variables
 |
 |  __weakref__
 |      list of weak references to the object

Is this message See help(type(self)) for accurate signature really useful? When do users benefit from seeing it?

Reproduisez la sortie signalée avec help(A), help(A.init) et une classe B vide. Suivez l'endroit où la docstring du init intégré et la sortie de classe de pydoc sont générées, puis identifiez la zone pertinente des tests de régression. C'est terminé lorsque les indications trompeuses sont corrigées ou supprimées de manière cohérente et que la sortie de help est couverte par des tests.