[Python-Dev] Requesting pronouncement on PEP 463: Exception-catching expressions (original) (raw)

Paul Moore p.f.moore at gmail.com
Wed Mar 12 17:21:35 CET 2014

On 12 March 2014 16:05, Chris Angelico <rosuav at gmail.com> wrote:

Tooling issues should already have been solved for lambda, but if you don't like the colon, go with one of the other options - Brett expressed support for 'then', which makes very good sense (it does require creating a new keyword, but it's a fairly safe one).

As a data point, Vim's syntax highlighting works mostly fine out of the box for the "top 4" proposed syntaxes. The keyword versions have minor issues - "then" is not highlighted at all and "pass" is highlighted as "pythonStatement" which is slightly jarring. The punctuation-based variants just don't highlight the ":" or "->" which is fine. Making "then" a keyword in Vim's syntax wouldn't be too hard, you'd probably put it in class "pythonException" along with except, try, finally and raise (which seems a bit odd, but that's actually the only place then is used as a keyword, so it's right). Making "pass" highlight as a statement when used standalone or as an expression keyword in an except would be tricky (i.e., I wouldn't know how to do it :-))

The highlighting issue is jarring enough to put me off the "pass" option.

Paul

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