Ezio Melotti added the comment:
This was considered a new feature when it was added in 3.2 (see #2650), so it
was not backported to 2.7 because -- even if it was a minor change -- it was
not 100% backward compatible.
--
assignee: -> ezio.melotti
resolution: -> rejected
stage: -> com
New submission from Vajrasky Kok:
$ ./python --version
Python 2.7.5+
$ ./python
Python 2.7.5+ (2.7:062533327ad2, Aug 19 2013, 22:44:52)
[GCC 4.7.2 20121109 (Red Hat 4.7.2-8)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> re.escape('_')
'\\_'
