.. _consider-using-f-string: consider-using-f-string / C0209 =============================== **Message emitted:** Formatting a regular string which could be a f-string **Description:** *Used when we detect a string that is being formatted with format() or % which could potentially be a f-string. The use of f-strings is preferred. Requires Python 3.6 and ``py-version >= 3.6``.* Created by ``refactoring`` checker