[Python-ideas] Type Hinting Kick-off

Nick Coghlan ncoghlan at gmail.com
Sat Dec 20 02:36:56 CET 2014

On 20 December 2014 at 10:55, Guido van Rossum <guido at python.org> wrote:

> 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 still a bit out of date and I didn't have time to update it yet.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.

This looks like a great direction to me. While I know it's not the primary
purpose, a multidispatch library built on top of it could potentially do
wonders for cleaning up some of the ugliness in the URL parsing libraries
(which have quite a few of those "all str, or all bytes, but not a mixture"
style interfaces).


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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