JS's shorthand property syntax is lovely and elegant. Python can't really adopt it though as it clashes with the set syntax (which is such a niche use case it really shouldn't have a special syntax).

You could do something like f(**{x, y, z}) with just that. Not the prettiest, but at least it would be DRY.

But in general Python devs seem to prefer "explicit" ad-hoc syntax for each use case instead of composable "primitives". Which is approaching a kind of C++ situation where relatively few users know the syntax comprehensively.