When programming in JS, I find myself aggressively aiming for as little 'let' and as much 'const' as reasonably possible, since reasoning about constants is much easier than about variables. In this context, 'const' is used as a marker, a runtime checker, and, with proper tooling (IDE or linter), a coding-time reminder to differentiate between these two fundamental behaviours.

I'm not +1 on introducing this idea to Python yet, but not -1 either - this deserves some discussion, if this has not been discussed already.

Cheers,

  S.