[Python-Dev] PEP 538 warning at startup: please remove it (original) (raw)

Terry Reedy tjreedy at udel.edu
Mon Jun 12 16:11:12 EDT 2017

On 6/12/2017 5:35 AM, INADA Naoki wrote:

On Mon, Jun 12, 2017 at 5:56 PM, Victor Stinner <victor.stinner at gmail.com> wrote:

Hi,

Nick Coghlan pushed his implementation of his PEP 538: nice! Nice step forward to UTF-8 everywhere ;-) I would prefer to not be annoyed by warning messages about encodings at startup if possible: "Python detected LCCTYPE=C: LCCTYPE coerced to C.UTF-8 (set another locale or PYTHONCOERCECLOCALE=0 to disable this locale coercion behavior)."

I do not see this with my fresh 3.7 repository debug build on my Win 10 machine. If I did, I would be -1000. This warning should be treated as a deprecation warning, off by default.

This is intentional behavior, to motivate people to use UTF-8 locale without coercion.

I thought the idea of the PEP was to do the right thing without making people do anything.

Note: I don't consider that 2>/dev/null is a good practice to ignore a single warning, since it will ignore all message written into stderr, including useful warnings like ResourceWarning or "Exception ignored ...". I think "Good practice" is set LCCTYPE=C.UTF-8 environment variable, as warning says.

I do not have any locale-related env vars. You should check whether the warning is off on all Win10 systems, as well as Win7 and Win8. Many Windows users know nothing about ENV VARS, and even if they do, they may not know how (I don't know the details) or MAY NOT BE ABLE to set one permanently.

-- Terry Jan Reedy

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