[Python-ideas] Type Hinting Kick-off

A few months ago we had a long discussion about type hinting. I've thought a lot more about this. I've written up what I think is a decent "theory" document -- writing it down like this certainly helped *me* get a lot of clarity about some of the important issues. https://quip.com/r69HA9GhGa7J I should thank Jeremy Siek for his blog post about Gradual Typing, Jukka Lehtosalo for mypy (whose notation I am mostly borrowing), and Jim Baker for pushing for an in-person meeting where we all got a better understanding of several issues. There's also a PEP draft, written by Łukasz Langa and revised by him based on notes from the above-mentioned in-person meeting; unfortunately it is still a bit out of date and I didn't have time to update it yet. Instead of working on the PEP, I tried to implement a conforming version of typing.py, for which I also ran out of time -- then I decided to just write up an explanation of the theory. I am still hoping to get a PEP out for discussion in early January, and I am aiming for provisional acceptance by PyCon Montréal, which should allow a first version of typing.py to be included with Python 3.5 alpha 4. If you are wondering how I can possibly meet that schedule: (a) the entire runtime component proposal can be implemented as a single pure-Python module: hence the use of square brackets for generic types; (b) a static type checker is not part of the proposal: you can use mypy, or write your own. -- --Guido van Rossum (python.org/~guido) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-ideas/attachments/20141219/520a24e9/attachment.html>