[Python-Dev] Improve open() to support reading file starting with an unicode BOM
walter at livinglogic.de
Mon Jan 11 11:37:56 CET 2010
On 09.01.10 14:38, Victor Stinner wrote:
> Le samedi 09 janvier 2010 12:18:33, Walter Dörwald a écrit :
>>> Good idea, I choosed open(filename, encoding="BOM").
>> On the surface this looks like there's an encoding named "BOM", but
>> looking at your patch I found that the check is still done in
>> TextIOWrapper. IMHO the best approach would to the implement a *real*
>> codec named "BOM" (or "sniff"). This doesn't require *any* changes to
>> the IO library. It could even be developed as a standalone project and
>> published in the Cheeseshop.
> Why not, this is another solution to the point (2) (Check for a BOM while
> reading or detect it before?). Which encoding would be used if there is not
> BOM? UTF-8 sounds like a good choice.
UTF-8 might be a good choice, are the failback could be specified in the
encoding name, i.e.
falls back to UTF-8, if there's no BOM at the start.
This could be implemented via a custom codec search function (see
http://docs.python.org/library/codecs.html#codecs.register for more info).
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