As iOS and Mac become more friendly to amateur programmers, learning to code and build your own apps has never been more tempting. And you don’t need to set foot in an expensive school to do so.

Mypy, Pytype, Pyright, and Pyre can help you keep your type-hinted Python code bug-free. Let’s see what each of these useful tools has to offer. In the beginning, Python had no type decorations. That ...