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Tue Feb 10 13:58:27 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-February/042493.html

"Edward C. Jones" <edcjones at erols.com> wrote in message
news:402901C1.4040405 at erols.com...
> Why was Python syntax designed so
>     except (TypeError, ValueError):
> is OK but
>     except [TypeError, ValueError]:
> is forbidden.

Because one way to do it is enough!  Func[arg] is also forbidden for same
reason.

> Should this be changed?

>From a user viewpoint, definitely NO.  0 benefit, + learning and memory
cost

> Is immutability needed here?

Turn the question around: is mutability needed here?  No, the sequence is
not named (usually) and so there is no possibility of mutation and no use
for it if it is.

Terry J. Reedy

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[Python-Dev] Re: Syntax for "except"