I know PyCharms is working on using them for its type-hints as well as offering better auto-completion options.
Re:Python 3.5.0
by techdragon on Sunday September 13, 2015 @03:57PM
(#10212601)
And this is why I paid for Pycharm. (and why their change in pricing model is so damn awkard, I both love them and hate them at the moment.)
Looking forward to this as well. So far the only static analysis tool I'm aware of that makes use of the PEP 484 framework is mypy [1] -- does anybody happen to know of other tools in the works?
[1] http://mypy-lang.org/