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

[Steven D'Aprano]

On Thu, Jul 19, 2018 at 10:33:21AM +0200, Antoine Pitrou wrote:

>      def insort_right(a, x, lo=0, hi=None):
>          # ...
>          hi = hi else len(a)

I read that as "hi, if it is truthy, else len(a)".

The advantage of ?? as None-aware operator is that it cannot possibly be 
misread as applying to arbitrary falsey objects:

- for those familiar with the equivalent from other languages, 
  the use of ?? to check for nil/null/None is familiar and obvious;

- for those who aren't, the ?? syntax avoids leading them to guess
  the wrong behaviour, as "else" would do.


P.S. I just had to delete 40+ screenfuls of irrelevant quoted text. Come 
on folks, please trim your posts! Don't blame your tools.



-- 
Steve