On Sun, Oct 3, 2021 at 11:40 PM Steven D'Aprano <steve@pearwood.info> wrote:
On Sun, Oct 03, 2021 at 11:34:55AM -0700, Guido van Rossum wrote:

> I also think that the bar should be pretty high before we reopen the
> *syntax* -- the PEP was approved without anyone (neither the SC, nor
> Nathaniel, nor anyone else) providing any feedback on the use of 'except
> *'. So I think it's a bit late to be bikeshedding the syntax. This thread
> was meant to solicit feedback on how to *format* it: does the space go
> before or after the '*'.

`except* E`, otherwise it looks like unpacking E.

I think it's worth noting that the following is already legal:

Python 3.9.7 (tags/v3.9.7:1016ef3, Aug 30 2021, 20:19:38) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> exceptions = (ValueError, TypeError)
>>> try:
...   raise TypeError
... except exceptions:
...   print("caught")

Indeed, when I first learned that you could do this (a few years ago IIRC), my first thought was to unpack the "exceptions" tuple with a star. It wasn't until I tried that and got a SyntaxError that I tried it the way shown here and it worked.

Allowing `except *E` for this new feature would take that helpful-to-a-beginner SyntaxError and turn it into a subtle and unhelpful bug.

Therefore my vote is for requiring `except* E` and keeping `except *E` as a SyntaxError.