[issue27921] f-strings: do not allow backslashes

[Eric V. Smith]

Changes by Eric V. Smith <eric at trueblade.com>:


----------
keywords: +patch
Added file: http://bugs.python.org/file44311/27921.patch

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27921>
_______________________________________