Sometimes it doesn't cost much if anything to add a feature which improves (type) safety. Now that Python has some type annotation support, it could make sense

Sometimes it doesn't cost much if anything to add a feature which improves (type) safety. Now that Python has some type annotation support, it could make sense to also add a const annotation. Go should have had it from the beginning IMO, immutability can help avoid some coding mistakes and also makes it easier to reason about code. It'a nice match for a language with static typing.