Pyrefly is not the first Python type-checking tool from Meta. Previously, the company delivered Pyre, written in OCaml. Pyre ...

Python type hints are used ahead of time, by the type-checking system; for instance, in your editor or IDE. In other words, Python’s type hints are for the developer , not the runtime.

In this article, I start exploring mypy and how you can use it to check for problems in your programs. I've been impressed by mypy ... I've grabbed Sequence from the typing module, which includes all ...

Learn how Mypy's type checking works with functions and generators. In my last two articles I've described some of the ways Mypy, a type checker for Python, can help identify potential problems with ...

But Pyright isn't aiming to compete with that tool, rather to just improve on its type-checking capabilities, which are powered by the Microsoft Python Language Server that uses the language server ...