On Thu, Jul 20, 2023, 01:19 Rob Cliffe via Python-ideas < python-ideas@python.org> wrote:
> > > On 15/07/2023 21:08, Dom Grigonis wrote: > > Just to add. I haven’t thought about evaluation. Thus, to prevent > evaluation of unnecessary code, introduction of C-style expression is > needed anyways: > > 1. result = bar is None ? default : bar > > > The below would have to evaluate all arguments, thus not achieving > benefits of PEP505. > > 2. result = ifelse(bar is None, default, bar) > > > > So I would vote for something similar to: > > result = bar is None ? default : bar > > > Where default and bar is only evaluated if needed. Although not to the > extent as initially intended, it would offer satisfiable solutions to > several proposals. > > Well, default is only evaluated if needed; bar is always evaluated. > What is wrong with the Python equivalent > > result = default if bar is None else bar > or if you prefer > result = bar if bar is not None else default > Note also that when the condition is a truthiness check -- admittedly not always the case, but it does occur reasonably often -- this can be simplified further to: result = bar or default >
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