[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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