[saila]

Black doesn't split strings, and I doubt they'd choose to use concatenation if they did.

[hathawsh]

I kind of wish Black would split and join literal strings. I've seen several times when Black converted code like this:

    raise SomeError(
        "Explanation... "
        "yet more explanation"
    )

To this:

    raise SomeError(
        "Explanation... " "yet more explanation"
    )

That just looks odd. Black is fantastic, but not perfect.

[d0mine]

Black does split strings if configured and it does use implicit concatenation of Python string literals.

[saila]

There's an experimental option for splitting long strings using the --preview flag, but it still seems to have some potential issues. That seems like it would be extremely hard to solve correctly.