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Mon Dec 15 09:20:44 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-December/084364.html

Jeffrey Yasskin schrieb:
> On Sun, Dec 14, 2008 at 8:26 AM, Guido van Rossum <guido at python.org> wrote:
>> On Sat, Dec 13, 2008 at 2:11 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
>>> Guido van Rossum <guido <at> python.org> writes:
>>>>
>>>> I think we should not do this. We should use 4 space indents for new
>>>> files, but existing files should not be reindented.
>>>
>>> Well, right now many files are indented with a mix of spaces and tabs, depending
>>> on who did the edit and how their editor was configured at the time.
>>
>> That's  a shame. We used to have more rigorous standards than allowing that.
>>
>>> Perhaps a graceful policy would be to mandate that all new edits be made with
>>> spaces without touching other functions in the file. Then hopefully the code
>>> base would gradually converge to a tabless scheme.
>>
>> I don't think so. I find local consistency more important than global
>> consistency. A file can become really hard to read when different
>> indentation schemes are used in random parts of the code.
>>
>> If you have a problem configuring your editor, just say so and someone
>> will explain how to do it.
> 
> I've never figured out how to configure emacs to deduce whether the
> current file uses spaces or tabs and has a 4 or 8 space indent. I
> always try to get it right anyway, but it'd be a lot more convenient
> if my editor did it for me. If there are such instructions, perhaps
> they should be added to PEPs 7 and 8?

I use this little hack to detect indentation in Python's C files:

(defun c-select-style ()
  "Hack: Select the C style to use from buffer indentation."
  (save-excursion
    (if (re-search-forward "^\t" 3000 t)
        (c-set-style "python")
      (c-set-style "python-new"))))

(add-hook 'c-mode-hook 'c-select-style)

-- where "python" and "python-new" are two appropriate c-mode styles.

Georg

-- 
Thus spake the Lord: Thou shalt indent with four spaces. No more, no less.
Four shall be the number of spaces thou shalt indent, and the number of thy
indenting shall be four. Eight shalt thou not indent, nor either indent thou
two, excepting that thou then proceed to four. Tabs are right out.

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[Python-Dev] Reindenting the C code base?