I'm not changing repr(f) at all, only str(f). But yes, str(f) will always be f() regardless of the signature. Note that neither repr(f) nor error messages involving f write the signature, so I don't plan to add the signature either.

>>> def f(a, b): pass
>>> f
<function f at 0x7f9c6e259160>
>>> f(**1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: f() argument after ** must be a mapping, not int

Sorry, I meant str(f). My concern was just that printing out f() may cause the misleading impression that f takes no arguments, while that is not the case for <function f at 0x7f9c6e259160> (because it has no parentheses).

This PR is stale because it has been open for 30 days with no activity.

I don't think that this change is a good idea: #81826 (comment). There is no activity for 7 years, I close the issue.