[Python-Dev] PEP 526 (variable annotations) accepted provisionally

[Ryan Gonzalez]

:D

--
Ryan
[ERROR]: Your autotools build scripts are 200 lines longer than your
program. Something’s wrong.
http://kirbyfan64.github.io/
On Sep 7, 2016 1:20 PM, "Guido van Rossum" <guido at python.org> wrote:

> I'm accepting PEP 526 provisionally.
>
> I am personally confident that this PEP is adding a useful new feature
> to the language: annotations that can be used by a wide variety of
> tools, whether off-line type checkers or frameworks that add runtime
> checking (e.g. traits or traitlets).
>
> The provisional status reflects the understanding that minor details
> of the proposed syntax and its runtime effects may still have to
> change based on experience during the 3.6 life cycle. (For example,
> maybe we end up not liking ClassVar, or maybe we'll decide we'll want
> to support `x, y, z: T` after all.)
>
> There's been some quite contentious discussion about the PEP, on and
> off python-dev, regarding how the mere presence of annotation syntax
> in the language will change the way people will see the language. My
> own experience using mypy and PyCharm has been quite different:
> annotations are a valuable addition for large code bases, and it's
> worth the effort to add them to large legacy code bases (think
> millions of lines of Python 2.7 code that needs to move to Python 3 by
> 2020). The effect of this has been that engineers using Python are
> happier and more confident that their code works than before, have an
> easier time spelunking code they don't know, and are less afraid of
> big refactorings (where conversion to Python 3 can be seen as the
> ultimate refactoring).
>
> I should blog about our experience at Dropbox; I hope the Zulip open
> source folks (not at Dropbox) will also blog about their experience.
> In the meantime you can read Daniel F. Moisset's three-part blog about
> adding annotations to pycodestyle (formerly pep8) here:
>
> http://www.machinalis.com/blog/a-day-with-mypy-part-1/
>
> If you want to see a large open source code base that's annotated for
> mypy (with 97% coverage), I recommend looking at Zulip:
> https://github.com/zulip/zulip
>
> Finally, some of us are starting a new (informational) PEP to set
> expectations for how type checkers should make use of the annotation
> syntax standardized by PEP 484 and PEP 526. This is going to take more
> time, and new collaborators are welcome here:
> https://github.com/ilevkivskyi/peps/blob/new-pep/pep-0555.txt. (Mark,
> I really hope you'll accept the invitation to participate. Your
> experience would be most welcome.)
>
> --
> --Guido van Rossum (python.org/~guido)
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