[Python-Dev] lib2to3, need some light on the imports fixer

[Collin Winter]

On Fri, May 16, 2008 at 10:42 AM, Guilherme Polo <ggpolo at gmail.com> wrote:
> 2008/5/16 Collin Winter <collinw at gmail.com>:
>> On Fri, May 16, 2008 at 10:30 AM, Guilherme Polo <ggpolo at gmail.com> wrote:
>>> 2008/5/12 Collin Winter <collinw at gmail.com>:
>>>> On Mon, May 12, 2008 at 1:58 PM, Guilherme Polo <ggpolo at gmail.com> wrote:
>>>>> Hello,
>>>>>
>>>>>  Would someone tell me how can I add a new entry in the MAPPING dict in
>>>>>  the lib2to3/fixes/fix_imports.py that does the following:
>>>>>
>>>>>  "import A" gets fixed as "import C.D as A"
>>>>>
>>>>>  Right now it is fixing by doing "import C.D" and changing several
>>>>>  other lines in the code to use this new "C.D" name. I wanted to avoid
>>>>>  these changes if possible.
>>>>
>>>> I don't believe there's a way to do that, but adding support for it
>>>> should be fairly straight-forward. Assign the patch to me for review.
>>>>
>>>
>>> Is there something I could read get some 2to3 understanding ?
>>
>> The README is a very shallow overview, but it needs to be beefed up to
>> talk about architecture. Honestly, the best way (currently) is to read
>> the existing fixers. Mea culpa.
>>
>>> How do I construct patterns ?
>>
>> find_pattern.py is the tool I wrote/use to find patterns. You give it
>> some Python code and it spits out the pattern for it. It's hard to
>> hand-construct patterns due to some optimizations done to eliminate
>> unneeded nodes (nodes with only a single child are eliminated, pulling
>> the child to its grandparent).
>>
>
> I see find_pattern.py is only at
> http://svn.python.org/projects/sandbox/trunk/2to3.
> Now I remember I saw it some time ago, but was trying to find it at
> python's repo and couldn't find it =)

Please make your changes to
http://svn.python.org/projects/sandbox/trunk/2to3; the Python copy
should be synced from there, not the other way around.