[Python-ideas] PEP 505: None-aware operators

Todd toddrjen at gmail.com
Thu Jul 19 20:32:57 EDT 2018


On Thu, Jul 19, 2018, 08:47 Rhodri James <rhodri at kynesim.co.uk> wrote:

> On 19/07/18 09:33, Antoine Pitrou wrote:
> > There is a use case I sympathize with: the argument-is-None case.  For
> > that I would suggest a simpler form:  "A else B" which would evaluate
> > to A if A is not None, otherwise to B (parentheses may be mandatory).
> >
> > So e.g. one of the examples would read:
> >
> >       def insort_right(a, x, lo=0, hi=None):
> >           # ...
> >           hi = hi else len(a)
> >           # ...
>
> Much as I would like a keyword, "else" is the wrong one.  It implies we
> are dealing with truthiness, which we aren't, and lays a subtle semantic
> trap as a consequence.
>
> If anyone can think of a good word for "if it isn't None, otherwise",
> I'd be all for it :-)
>

What about "nelse"?

>
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