use-implicit-booleaness-not-comparison / C1803#
"%s" can be simplified to "%s", if it is strictly a sequence, as an empty %s is falsey
Empty sequences are considered false in a boolean context. Following this check blindly in weakly typed code base can create hard to debug issues. If the value can be something else that is falsey but not a sequence (for example ``None``, an empty string, or ``0``) the code will not be equivalent.
z =  if z != : # [use-implicit-booleaness-not-comparison] print("z is not an empty sequence")
z =  if z: print("z is not an empty sequence")
Created by the refactoring checker.