The popularity of black makes it a Schelling point [0]. It's not my favorite code style. At some point before the enum module was added, I picked a habit of using single-quote 'strings' for internal fixed strings and double-quote "strings" for human-readable messages. Black's formatting of strings to all use double quotes removes this distinction. But having some 95% solution can get 95% of people to agree to it, which is enough to avoid arguments that never reach a conclusion.