On 1 September 2016 at 18:21, Steven D'Aprano <st...@pearwood.info> wrote:
> The simplest way would be to say "go on, one type hint won't hurt, > there's no meaningful runtime cost, just do it". > > from typing import Any > > class X: > NAME: Any > > Since I'm not running a type checker, it doesn't matter what hint I use, > but Any is probably the least inaccurate. > > But I think there's a better way. > > Unless I've missed something, there's no way to pre-declare an instance > attribute without specifying a type. (Even if that type is Any.) So how > about we allow None as a type-hint on its own: > > NAME: None > > as equivalent to a declaration *without* a hint. The reader, and the > type-checker, can see that there's an instance attribute called NAME, > but in the absense of an actual hint, the type will have to be inferred, > just as if it wasn't declared at all. > There is a convention for function annotations in PEP 484 that a missing annotation is equivalent to Any, so that I like your first option more. -- Ivan
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