[attributions lost - sorry, but I can't get 'em back] ...
Similar to import statements, optional parentheses could be included in the grammar, allowing the name bindings to be split across multiple lines:
if diff and g > 1 given ( diff = x - x_base, g = gcd(diff, n), ): return g
I'm well behind, but... this! This turns "given" into a +0.8 for me.
That's really nice. It reads clearly too.
That's longer than this:
diff = x - x_base g = gcd(diff, n) if diff and g > 1: return g
which is already valid.
Since that was my example to begin with, I think it's fair to point out that they all miss a key part of the original example: this code is working with multi-thousand bit integers, and calling gcd() is expensive. It was a key point that if (diff := x - x_base) and (g := gcd(diff, n)) > 1: return g didn't call gcd() _at all_ unless `diff` was non-zero. The original real-life code was: diff = x - x_base if diff: g = gcd(diff, n) if g > 1: return g