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[Python-ideas] except expression

Amber Yust amber.yust at gmail.com
Thu Feb 13 04:25:50 CET 2014 
Another possible option:

foo = something() except None for BarException

With possible support for:

foo = something() except e.message for BarException as e
On Feb 12, 2014 7:20 PM, "Amber Yust" <amber.yust at gmail.com> wrote:

> Ah, that's a good point (the two-directionality of yield had slipped my
> mind). I had considered suggesting return instead of yield, which wouldn't
> have that problem, but it felt like return would be more confusing to see
> in a context where it doesn't actually return from the enclosing scope.
> On Feb 12, 2014 7:16 PM, "Chris Angelico" <rosuav at gmail.com> wrote:
>
>> On Thu, Feb 13, 2014 at 2:08 PM, Amber Yust <amber.yust at gmail.com> wrote:
>> > Why not use yield instead of else?
>> >
>> > foo = something() except BazException yield "bar"
>>
>> yield is already an expression. It'd be theoretically and
>> syntactically valid (if a little weird) to use yield "bar" in place of
>> the name BazException; you'd yield "bar" to your caller, then whatever
>> exception gets sent in would be the one tested for. I honestly cannot
>> conceive of any situation where this would actually be useful, but it
>> does make it a little tricky to reuse that keyword :)
>>
>> ChrisA
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