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

[Joao S. O. Bueno]

On 23 February 2015 at 16:47, Antoine Pitrou <solipsis at pitrou.net> wrote:
> 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.

The real problem there, even motivating the request, seems to be new
users in Windows platforms
using "\" as file path separator.

That happens all the time, and is this use case that should possibly
be addressed here - maybe
something as simple as adding a couple of paragraphs to different places
in the documentation could mitigate the issue. (in contrast to make a
tons of otherwise valid code
to become deprecated in a couple releases).

>
> Regards
>
> Antoine.
>
>
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