HOW WELL DO NEW PYTHON TYPE CHECKERS CONFORM? A DEEP DIVE INTO TY, PYREFLY, AND ZUBAN

Summary from the TLDR newsletter

Three new Python type-checking tools have emerged this year, each backed by significant pedigree and resources. While the tools are all built in Rust, they all have different goals and philosophies. The continued shift towards Rust-based implementations promises faster type checking, better IDE integration, and an improved developer experience for large codebases. This post looks at how well the new Python type checkers conform to provide insight into specification compliance. While conformance test coverage is important for specification compliance and handling edge cases, it is not always the best predictor of a type checker's utility for everyday Python development.