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.

Computer languages have strict rules programmers must follow in order to make their programs understood. Mistakes throw up errors, which must be fixed.

Python, just by its very nature, already has a huge problem with runtime bug discovery. Ideally, with a compiled language, as much as possible you want bugs to be discoverable at compile time.

Of course, you may never need to build your own debugger — most of the IDEs have already done this for you, and some of the code is, in fact, lifted from an open code base and simplified.