Coming from the @ side (I was strong +1 on this), I have troubles seeing the
real benefits from ?? (And even more from associates): did we really have long
and complex expressions where the compactness of an operator would help?
Operators are inherently obscure (except for those that are learnt in
elementary school), but they help when you combine multiple operators and
benefit from their precedence rules. There you can benefit from them, even if
explicit it's better than implicit...
It was the case for @, and even with proofs of long formulas, and a history of
matrix algebra from hundreds of years before computing science, the resistance
was strong: a majority of non-numpy users resisted it, saying a function
matmul(A,B) was good enough and A@B would bring nothing.
It was eventually accepted, 7 or so years after the initial proposal, through
another PEP, when relative weight of numpy community was probably larger.
So i'd like to see examples of long expressions that would really benefit groin
using an very specific operator. At this point, the explicitness of "a if a is
not None else []" wins, by a long shot...
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