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Mon Feb 23 20:47:51 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-February/138457.html

On Mon, 23 Feb 2015 09:29:09 -0800
Guido van Rossum <guido at python.org> wrote:
> On Mon, Feb 23, 2015 at 9:01 AM, Ethan Furman <ethan at stoneleaf.us> wrote:
> 
> > On 02/23/2015 08:12 AM, Brett Cannon wrote:
> > > On Mon Feb 23 2015 at 10:55:23 AM Chris Angelico wrote:
> >
> > >> Is it at all possible for this to be introduced in the 2.x line [...]
> > >
> > > Starts with a minor version.
> >
> > Isn't there a -3 switch or something like that in 2.7.x to trigger
> > warnings/errors to help port to 3.x?  Seems like this
> > kind of warning could go there.
> >
> 
> If we agree it will be a syntax error in 3.x eventually.

That sounds frankly like a pedantic change.

Regards

Antoine.

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[Python-Dev] Emit SyntaxWarning on unrecognized backslash escapes?