[Python-Dev] What does a double coding cookie mean? (original) (raw)

Chris Angelico rosuav at gmail.com
Wed Mar 16 02:07:53 EDT 2016

On Wed, Mar 16, 2016 at 5:03 PM, Serhiy Storchaka <storchaka at gmail.com> wrote:

On 15.03.16 22:30, Guido van Rossum wrote:

I came across a file that had two different coding cookies -- one on the first line and one on the second. CPython uses the first, but mypy happens to use the second. I couldn't find anything in the spec or docs ruling out the second interpretation. Does anyone have a suggestion (apart from following CPython)? Reference: https://github.com/python/mypy/issues/1281 There is similar question. If a file has two different coding cookies on the same line, what should win? Currently the last cookie wins, in CPython parser, in the tokenize module, in IDLE, and in number of other code. I think this is a bug.

Why would you ever have two coding cookies in a file? Surely this should be either an error, or ill-defined (ie parsers are allowed to pick whichever they like, including raising)?

ChrisA

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