Sergey B Kirpichev <skirpic...@gmail.com> added the comment:

On Fri, May 28, 2021 at 06:48:14AM +0000, Mark Dickinson wrote:
> So yes please to the PR. There should be tests that check that only the
> underscore rules allowed by `int` and the others are supported: e.g.,
> `Fraction("1__2")`, and `Fraction("1_2_")` should be errors.

Ok, I did.

In the initial version I catch int()'s exceptions to
return a correct exception details.  Maybe it's better to fix
the regexp instead (don't match "wrong" strings).  I think
this might be more complicated for readers...

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<https://bugs.python.org/issue44258>
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