Petr Viktorin <encu...@gmail.com> added the comment:

I am not convinced.

I'm wary of making error messages depend on the str representation of a 
function; that would prevent us from changing it later.
I'm wary of "%S" used in error messages. Those are for the programmer, not the 
user, so they should prefer __repr__.

I train beginners to recognize "<function f at 0x7f9f4bbe5e18>" as a sign of 
omitted parentheses. The ugliness is useful: it shows you're dealing with an 
internal object, not a data value.

So, I think "<function f>" is much better than just "f()". I wouldn't mind 
"<function f()>" (maybe even with the full signature), but that doesn't quite 
help this case.
(I don't care much for the "at 0x7f9f4bbe5e18" part, but that's not the issue 
here.)

----------
nosy: +petr.viktorin

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<https://bugs.python.org/issue37645>
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