[Python-Dev] What does a double coding cookie mean? (original) (raw)
M.-A. Lemburg mal at egenix.com
Wed Mar 16 03:59:31 EDT 2016
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On 16.03.2016 01:28, Guido van Rossum wrote:
I agree that the spirit of the PEP is to stop at the first coding cookie found. Would it be okay if I updated the PEP to clarify this? I'll definitely also update the docs.
+1
The only reason to read up to two lines was to address the use of the shebang on Unix, not to be able to define two competing source code encodings :-)
On Tue, Mar 15, 2016 at 2:04 PM, Brett Cannon <brett at python.org> wrote: >>>>> On Tue, 15 Mar 2016 at 13:31 Guido van Rossum <guido at python.org> 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 >>>>> I think the spirit of PEP 263 is for the first specified encoding to win as > the support of two lines is to support shebangs and not multiple encodings > :) . I also think the fact that tokenize.detectencoding() doesn't > automatically read two lines from its input also suggests the intent is > "first encoding wins" (and that is the semantics of the function). >>
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