Guido van Rossum, Jukka Lehtosalo, & Łukasz Langa (2014)
Python Enhancement Proposals.
URL: https://peps.python.org/pep-0484/
Abstract. The foundational PEP that introduced optional type hints to Python, building on function annotations (PEP 3107) and the mypy type checker. Defines the syntax and semantics for type annotations, the typing module, type variables, generics, and the gradual typing model. This PEP transformed Python's ecosystem by enabling static analysis while preserving the language's dynamic nature.
Tags: python type-hints pep static-analysis