Fix handling of non ascii characters in swap case (fixes: #3847) (#3848)

* #3847 fix handling of non-ASCII characters in swap_case

* #3847 remove unused regex

* Fix formatting (with black) Fixes: #3847

* Add type hints for `swap_case` function

Co-authored-by: Frank Schmitt <frankschmitt@gmx.de>
Co-authored-by: Dhruv Manilawala <dhruvmanila@gmail.com>

Frank Schmitt committed 5y ago

c0d88d7f71b0234740696cbe48d7ed88900261c1

Parent: c8db6a2

Committed by GitHub <noreply@github.com> on 11/6/2020, 5:09:12 PM