On Tue, 25 Jul 2017 11:41 am, Ben Finney wrote:
> Howdy all,
>
> How can I stop Python from deleting a name binding, when that name is
> used for binding the exception that is caught? When did this change in
> behaviour come into Python?
>
>
> I am writing code to run on both Python 2 and Python 3::
>
> exc = None
> try:
> 1/0
> text_template = "All fine!"
> except ZeroDivisionError as exc:
> text_template = "Got exception: {exc.__class__.__name__}"
>
> print(text_template.format(exc=exc))
>
> Notice that `exc` is explicitly bound before the exception handling, so
> Python knows it is a name in the outer scope.
Ethan has already answered your direct question, but I'd like to make an
observation: there's no "outer scope" here, as the try...except statement
doesn't introduce a new scope. All your code above runs in a single scope with
a single namespace. It isn't that the except block is in a different scope, but
that the except statement now explicitly calls "del" on the exception name when
the block ends.
--
Steve
“Cheer up,” they said, “things could be worse.” So I cheered up, and sure
enough, things got worse.
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