[Python-Dev] What does a double coding cookie mean?

[Serhiy Storchaka]

On 17.03.16 15:14, M.-A. Lemburg wrote:
> On 17.03.2016 01:29, Guido van Rossum wrote:
>> Should we recommend that everyone use tokenize.detect_encoding()?
>
> I'd prefer a separate utility for this somewhere, since
> tokenize.detect_encoding() is not available in Python 2.
>
> I've attached an example implementation with tests, which works
> in Python 2.7 and 3.

Sorry, but this code doesn't match the behaviour of Python interpreter, 
nor other tools. I suggest to backport tokenize.detect_encoding() (but 
be aware that the default encoding in Python 2 is ASCII, not UTF-8).