"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?

使用 help(A)、help(A.init) 和一个空类 B 重现报告的输出。跟踪内置 init 的文档字符串和 pydoc 类输出的生成位置，然后确定相关的回归测试区域。完成标准是：误导性的指导得到一致的更正或移除，并且 help 输出有测试覆盖。