On 16.03.16 08:03, Serhiy Storchaka 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.

I just tested with Emacs, and it looks that when specify different codings on two different lines, the first coding wins, but when specify different codings on the same line, the last coding wins.

Therefore current CPython behavior can be correct, and the regular expression in PEP 263 should be changed to use greedy repetition.

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