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Mon Feb 8 11:01:15 EST 2016 · https://mail.python.org/pipermail/python-dev/2016-February/143152.html

> On Feb 8, 2016, at 06:40, Victor Stinner <victor.stinner at gmail.com> wrote:
> 
> 2016-02-08 15:32 GMT+01:00 Victor Stinner <victor.stinner at gmail.com>:
>> Since 3.3, functions of the os module started to emit
>> DeprecationWarning when called with bytes filenames.
>> (...)
>> Recently, an user complained that os.walk() doesn't work with bytes on
>> Windows anymore:
>> (...)
> 
> It's also sad to see that deprecation warnings are completly ignored.
> Python 3.3 was release in 2011, 5 years ago.

> 
> I would prefer to show deprecation warnings by default. But I know
> that it's an old debate: developers vs users :-) I like to see my
> users as potential developers ;-)

This is tracked in this issue:

http://bugs.python.org/issue24294 <http://bugs.python.org/issue24294> :  DeprecationWarnings should be visible by default in the interactive REPL

IPython have enabled them only if they come from __main__. From totally subjective experience, 
that has already pushed a few library to update their code to new apis[1].
-- 
M

[1] or sometime to wrap code in ignore warnings...

> 
> Victor
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[Python-Dev] Windows: Remove support of bytes filenames in the os module?