Instead, the proposal assumes the existence of a separate off-line _annotations_ attribute, no type checking happens at runtime. While these annotations are available at runtime through the usual Simply enables better coordination, as PEP 333 did for web frameworks.įor example, here is a simple function whose argument and return typeĭef greeting ( name : str ) -> str : return 'Hello ' + name Of annotations, even when they conform to this specification. Note that this PEP still explicitly does NOT prevent other uses ofĪnnotations, nor does it require (or forbid) any particular processing This PEP introduces a provisional module to provide these standardĭefinitions and tools, along with some conventions for situations Usage for static type analysis that the community would benefit fromĪ standard vocabulary and baseline tools within the standard library. PEP 3107 introduced syntax for function annotations, but the semantics What about existing uses of annotations?.Which brackets for generic type parameters?.Suggested syntax for Python 2.7 and straddling code.Compatibility with other uses of function annotations.Annotating generator functions and coroutines.Arbitrary argument lists and default argument values.Arbitrary generic types as base classes.Instantiating generic classes and type erasure.Toggle light / dark / auto colour theme PEP 484 – Type Hints Author : Guido van Rossum, Jukka Lehtosalo, Łukasz Langa BDFL-Delegate : Mark Shannon Discussions-To : Python-Dev list Status : Final Type : Standards Track Topic : Typing Created : 2 Python-Version : 3.5 Post-History : 1, 2, 1, 2, 2 Resolution : Python-Dev message PEP 484 – Type Hints | Following system colour scheme Selected dark colour scheme Selected light colour scheme Python Enhancement Proposals
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