New submission from Nick Coghlan <ncogh...@gmail.com>:

When implementing the "-X dev" mode, Victor was asked to make it behave 
differently from "-Wd", such that "python -bb -X dev" would still raise errors 
for bytes comparisons.

I don't think making "-X dev" and "-Wd" inconsistent with each other is the 
right way to address that request. Instead, I think we should find a way to 
make "-bb" *always* take precedence over any supplied "-W" options.

One way to do that would be to adopt an approach similar to what I've proposed 
for "-X dev" in https://bugs.python.org/issue32230: instead of making the 
warnings module aware of the "-bb" setting, we'd instead adjust the 
initialisation code to inject "error::BytesWarning" into sys.warnoptions 
*after* all of the entries from environment variables and the command line.

----------
messages: 307717
nosy: ncoghlan, vstinner
priority: normal
severity: normal
stage: needs patch
status: open
title: -bb option should override -W options
type: enhancement
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32231>
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