[Python-Dev] Quick sum up about open() + BOM
victor.stinner at haypocalc.com
Sat Jan 9 13:54:17 CET 2010
Le samedi 09 janvier 2010 01:47:38, vous avez écrit :
> One concern I have with this implementation encoding="BOM" is that if
> there is no BOM it assumes UTF-8.
If no BOM is found, it fallback to the current heuristic: os.device_encoding()
or system local.
> (...) Hence, it might be that someone would expect a UTF-16LE (or any of
> the formats that don't require a BOM, rather than UTF-8), but be willing
> to accept any BOM-discriminated format.
> (...) declare that they will accept
> any BOM-discriminated format, but want to default, in the absence of a
> BOM, to the original national language locale that they historically
You mean "if there is a BOM, use it, otherwise fallback to a specific
charset"? How could it be declared? Maybe:
open("file.txt", check_bom=True, encoding="UTF16-LE")
open("file.txt", check_bom=True, encoding="latin1")
About falling back to UTF-8, it would be written:
open("file.txt", check_bom=True, encoding="UTF-8")
As explained before, check_bom=True is only accepted for read only file mode.
Well, why not. This is a third choice for my point (1) :-) It's between Guido
and Antoine choice, and I like it because we can fallback to UTF-8 instead of
the dummy system locale: Windows users will be happy to be able to use UTF-8
:-) I prefer to fallback to a fixed encoding then depending on the system
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