[Python-ideas] Retain string form of AST Numbers

[Guido van Rossum]

Whoops, caps lock error. Didn't mean to shout. :-)

On Saturday, April 5, 2014, Guido van Rossum <guido at python.org> wrote:

> Lib2to3 has its own parser and tree so it can reconstruct the file, with
> comments. AST JUST THROWS AWAY TOO MUCH.
>
> On Saturday, April 5, 2014, Chris Angelico <rosuav at gmail.com<javascript:_e(%7B%7D,'cvml','rosuav at gmail.com');>>
> wrote:
>
>> On Sun, Apr 6, 2014 at 3:39 AM, Serhiy Storchaka <storchaka at gmail.com>
>> wrote:
>> > What about strings?
>> >
>> >>>> print(ast.dump(ast.parse(r"x = '''\x0a\u000d''' r'x'")))
>> > Module(body=[Assign(targets=[Name(id='x', ctx=Store())],
>> > value=Str(s='\n\rx'))])
>> >
>> > Tuples?
>> >
>> >>>> print(ast.dump(ast.parse("x = (1, 2,)")))
>> > Module(body=[Assign(targets=[Name(id='x', ctx=Store())],
>> > value=Tuple(elts=[Num(n=1), Num(n=2)], ctx=Load()))])
>>
>> I don't have any concrete use cases for those, but the same could be
>> done for every type of node as a general mechanism for recreating a
>> file more exactly. Nick linked to a tracker issue with some discussion
>> on docstrings, which could benefit from that. Or maybe it would be
>> better to avoid the AST altogether and do a source-level translation,
>> as mentioned in the blog post he also linked to.
>>
>> ChrisA
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>
>
> --
> --Guido van Rossum (on iPad)
>


-- 
--Guido van Rossum (on iPad)
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