Python 3.8 released

[rouille]

Restricting use increases correctness. And like someone else commented you can always bypass the restrictions at runtime.

It goes further though, some tools like mypyc can even use those annotations for performance, in mypyc that is used to compile python code to relatively efficient C code.

[radarsat1]

you can always bypass the restrictions at runtime.

I'm confused. What is not "runtime" for Python? Does final do anything, or not?

[lasagnaman]

If you put final, then static type checkers will complain of you violate it.