Python » PEP Index » PEP 484 Toggle light / dark / auto colour theme Author : Guido van Rossum <guido at python.org>, Jukka Lehtosalo <jukka.lehtosalo at iki.fi>, Łukasz Langa <lukasz at python.org> BDFL-Delegate : Mark Shannon Discussions-To : Python-Dev list Status : Final Type : Standards Track Topic : Typing Created : 29-Sep-2014 Python-Version : 3.5 Post-History : 16-Jan-2015, 20-Mar-2015, 17-Apr-2015, 20-May-2015, 22-May-2015 Resolution : Python-Dev message Table of Contents Abstract Rationale and Goals Non-goals The meaning of annotations Type Definition Syntax Acceptable type hints Using None Type aliases Callable Generics User-defined generic types Scoping rules for type variables Instantiating generic classes and type erasure Arbitrary generic types as base classes Abstract generic types Type variables wi...