The ?? operator is probably the less scary one regarding legibility, and in
guessing (or remembering) what it exactly does...
Well, at least I think I understand what it does exactly, but if I'm not wrong
there, what it does is also quite simple and minimal.
A function returning it's first non-None argument (or None, if all args are
None) will provide the same functionality, with not much typing. You have
parenthesis for the call, but you will probably need them anyway to group
things, for correcting precedence, or helping the reader to parse your
expression even if precedence was right.
You have an extra call, so ?? may be more efficient...maybe.
Is that a reason enough, together with a few letters saved typing, to introduce
?? ? Not for me...
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