[Python-Dev] Proposal: from __future__ import unicode_string_literals

[M.-A. Lemburg]

On 2008-03-21 22:32, Martin v. Löwis wrote:
>> It's not implementable because the work has to occur in ast.c (see 
>> Py_UnicodeFlag).  It can't occur later, because you need to skip the 
>> encoding being done in parsestr().  But the __future__ import can only 
>> be interpreted after the AST is built, at which time the encoding has 
>> already been applied.  
> 
> I think it would be possible to check for future statements on the
> basis of nodes already. Take a look at how Python 2.3 implemented
> future statements (why was that rewritten to use the AST, anyway?).
> 
>> As for it not making sense, this is really in the realm of 2to3.  I'm 
>> beginning to really believe this statement in PEP 3000:
> 
> There is still the original use case of people who don't want to run
> 2to3 (for whatever reasons - mostly probably subjective ones), and
> who would rather run a single code base unmodified. They don't care
> that documentation tells them this is impossible, when they feel they
> are so close to making it possible.

Could we point them to a special byte-code compiler such as Andrew
Dalke's python4ply:

http://dalkescientific.com/Python/python4ply.html

That approach appears to be a lot easier to implement than trying
to tweak the C implementation of the Python parser.

-- 
Marc-Andre Lemburg
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