PEP8 doesn't have a preference between single or double quotes. Black has: > It will replace the latter with the former as long as it does not result in more b

PEP8 doesn't have a preference between single or double quotes. Black has: > It will replace the latter with the former as long as it does not result in more backslash escapes than before. And I think that's good enough (and in compliance with PEP8)