On 2014-02-23 00:09, Chris Angelico wrote:
> On Sun, Feb 23, 2014 at 11:00 AM, Thomas Wouters <tho...@python.org>
> wrote:
>> On Sat, Feb 22, 2014 at 2:08 AM, Thomas Wouters <tho...@python.org>
>> wrote:
>>>
>>> (FWIW, I have a working patch without tests that allows all of
>>> these, I'll upload it tonight so people can play with it. Oh, and
>>> FWIW, currently I'm +0 on the idea, -0 on the specific syntax.)
>>
>>
>> http://bugs.python.org/issue20739 is the patch.
>
> Thanks!
>
> You make a comment about precedence. When I wrote that up, it was
> basically just "that seems about right"; whether it's equal to
> lambda, equal to if/else, above both, below both, or in between, is
> free to be tweaked according to what makes sense. Nobody has to date
> discussed the exact precedence order, so feel free to tweak it for
> the benefit of implementation.
>
My feeling is that catching exceptions should have a lower precedence
than the other parts of an expression, but higher than comma, so:
A if C else B except E: D
would be parsed as:
(A if C else B) except E: D
I think that's because it's kind of replacing:
try:
_ = expr
except E:
_ = D
with the try..except enclosing the expression.
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