On Feb 8, 2016, at 06:40, Victor Stinner <victor.stinner@gmail.com> wrote:

2016-02-08 15:32 GMT+01:00 Victor Stinner <victor.stinner@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 : 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].

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

Victor
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