[Python-Dev] 2to3 for python annotations (original) (raw)

Guido van Rossum guido at python.org
Tue Jul 17 16:34:25 EDT 2018

On Tue, Jul 17, 2018 at 1:17 PM, Jelle Zijlstra <jelle.zijlstra at gmail.com> wrote:

2018-07-17 12:37 GMT-07:00 Philippe Fremy <phil.fremy at free.fr>: Hi,

While contributing to pyannotate, I became familiar enough with 2to3 fixers to be able to convert Python 2 style annotations to Python 3. Is it something that would be interesting to put into python 2to3 ? If so I would propose a PR for this. There already a tool that does this: https://github.com/ ilevkivskyi/com2ann.

IIRC that tool so far only converts variable declarations with # type: comments to PEP 526 style. Doing function signatures too seems on the TODO list: https://github.com/ilevkivskyi/com2ann/issues/3

I am not sure it would be appropriate for 2to3. Type comments still work in Python 3, and I feel like 2to3 should do the minimum necessary to get working code in Python 3.

I think as an optional fixer it would be a fine contribution.

Also I apologize for not yet reviewing https://github.com/dropbox/pyannotate/pull/74 (which I presume is yours?).

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