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[Python-ideas] except expression

Antony Lee antony.lee at berkeley.edu
Thu Feb 13 06:46:37 CET 2014 
Even more generally (not sure allowing multiple clauses is a good idea but
at least "if" sounds better than "for", I think.
foo = bar() except e.attr1 if FooException as e else e.attr2 if
BarException as e

Antony Lee


2014-02-12 19:25 GMT-08:00 Amber Yust <amber.yust at gmail.com>:

> 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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>>
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