I completely understand your perspective, and agree with most of it. It doesn't add new expressiveness, it adds a bit of polish (and I think completeness) to the relatively new concept of 'with' statements.
Is this so intuitive that we don't actually have to teach it? Is it such a natural extension to 'with', that it would immediately be weird to find it missing in the future? If the answer to either of those questions is 'no', then I absolutely retract my idea. On Tue, Jan 22, 2019 at 3:22 PM Steven D'Aprano <st...@pearwood.info> wrote: > On Tue, Jan 22, 2019 at 01:11:10PM -0700, Paul Ferrell wrote: > > [...] > > I would like to propose that the syntax for 'with' blocks > > be changed such that they can be accompanied by 'except', 'finally', > > and/or 'else' blocks as per a standard 'try' block. > > What benefit does this give apart from saving one line and one indent? > If either is in short supply, the code probably needs refactoring, not > new syntax. > > The beauty of the current syntax is that try...except and with blocks > are fully independent, composable blocks which can be learned and > reasoned about seperately. You're proposing to add a new special-case > syntax: > > while ... > except ... > > that adds a new block structure that has to be implemented, documented, > tested, maintained, taught and learned. It will inevitably lead to > questions on mailing lists, IRC and Stackoverflow asking what is the > difference between a separate try...with...except and a with...except, > and when to choose one or the other. > > And of course then there will be the inevitable requests that we > generalise it to other blocks: > > for ... > except ... > > while ... > except ... > > If this will allow us to write more expressive code, or do things we > couldn't easily do before, then it might be worthwhile to add this > additional complexity. > > But if all it does is save one line and one indent, then I believe it is > redundant and I would be against it. > > > -- > Steve > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Paul Ferrell pfl...@gmail.com
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