[Python-Dev] 3to2 Project

[Paul Kippes]

Ron Duplain and I have been working on this at the sprint.  We're
working on getting the necessary 3to2 fixes in place and verified
first since dropping this in was quite simple.  The fixes don't look
to be too involved which should provide time for the recommended
refactorings.

Paul

On Mon, Mar 30, 2009 at 1:05 PM, Jesse Noller <jnoller at gmail.com> wrote:
> On Mon, Mar 30, 2009 at 12:37 PM, Collin Winter <collinw at gmail.com> wrote:
>> On Mon, Mar 30, 2009 at 7:44 AM, Jesse Noller <jnoller at gmail.com> wrote:
>>> During the Language summit this past Thursday, pretty much everyone
>>> agreed that a python 3 to python 2 tool would be a very large
>>> improvement in helping developers be able to write "pure" python 3
>>> code. The idea being a large project such as Django could completely
>>> cut over to Python3, but then run the 3to2 tool on the code based to
>>> continue to support version 2.x.
>>>
>>> I raised my hand to help move this along, I've spoke to Benjamin
>>> Peterson, and he's amendable to mentoring a GSoC student for this
>>> project and he's  already received at least one proposal for this.
>>>
>>> Additionally, there's been a number of developers here at PyCon who
>>> are more than ready to help contribute.
>>>
>>> So, if people are interested in helping, coordinating work/etc - feel
>>> free to sync up with Benjamin - he's started a wiki page here:
>>>
>>> http://wiki.python.org/moin/3to2
>>
>> If anyone is interested in working on this during the PyCon sprints or
>> otherwise, here are some easy, concrete starter projects that would
>> really help move this along:
>> - The core refactoring engine needs to be broken out from 2to3. In
>> particular, the tests/ and fixes/ need to get pulled up a directory,
>> out of lib2to3/.
>> - Once that's done, lib2to3 should then be renamed to something like
>> librefactor or something else that indicates its more general nature.
>> This will allow both 2to3 and 3to2 to more easily share the core
>> components.
>> - If you're more performance-minded, 2to3 and 3to2 would benefit
>> heavily from some work on the pattern matching system. The current
>> pattern matcher is a fairly simple AST interpreter; compiling the
>> patterns down to pure Python code would be a win, I believe. This is
>> all pretty heavily tested, so you wouldn't run much risk of breaking
>> it.
>>
>
> A second note on performance, is that Benjamin was about to checkin a
> version of 3to2 which used multiprocessing to help speed it up a bit -
> he had to catch a plane, so he should have it done some time shortly.
>
> -jesse
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