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

Brett Cannon brett at python.org
Thu Mar 17 11:37:32 EDT 2016 
On Thu, 17 Mar 2016 at 07:56 Guido van Rossum <guido at python.org> wrote:

> On Thu, Mar 17, 2016 at 5:04 AM, Serhiy Storchaka <storchaka at gmail.com>
> wrote:
> >> Should we recommend that everyone use tokenize.detect_encoding()?
> >
> > Likely. However the interface of tokenize.detect_encoding() is not very
> > simple.
>
> I just found that out yesterday. You have to give it a readline()
> function, which is cumbersome if all you have is a (byte) string and
> you don't want to split it on lines just yet. And the readline()
> function raises SyntaxError when the encoding isn't right. I wish
> there were a lower-level helper that just took a line and told you
> what the encoding in it was, if any. Then the rest of the logic can be
> handled by the caller (including the logic of trying up to two lines).
>

Since this is for mypy my guess is you only want to know the encoding, but
if you're simply trying to decode bytes of syntax then
importilb.util.decode_source() will handle that for you.
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