[Python-Dev] PEP 463: Exception-catching expressions

Nick Coghlan ncoghlan at gmail.com
Fri Feb 28 14:24:17 CET 2014

On 28 February 2014 23:07, Chris Angelico <rosuav at gmail.com> wrote:
> On Fri, Feb 28, 2014 at 11:51 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:
>> So I think that on balance, I actually do prefer your current
>> proposal. That said, I do think this is a variant worth discussing
>> explicitly in the PEP, if only to remind people that there's
>> definitely precedent for using a colon to separate two subexpressions
>> inside a larger expression element - it's not *just* used to introduce
>> suites, even though that is by far the most *common* use case.
> I've added a bit more to the PEP about that.
> https://github.com/Rosuav/ExceptExpr/commit/f32387
> Does that explain it, do you think?

Yeah, that works. You may also want to add a "common objections"
section to explicitly cover the "but colons introduce suites"
objection. That would provide a space to explicitly list all of the
current "not introducing a suite" use cases for the colon in Python's
syntax, since increasing that tally from four to five is less radical
than introducing the first non-suite related use case for the symbol.


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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