Improve formatting for multiline strings wrapped by parentheses with a method call

[ichard26]

Describe the style change

Multiline strings wrapped by parentheses with a method call are formatted in a questionable way. While I'm not sure what would be the best output, the desired style I provided is probably a good next step. The main point is to strip the unnecessary parentheses which cause Black to do some ... questionably looking stuff.

Examples in the current Black style

  def case1():
    (""" this is a multi-line
    string that is pretty poorly formatted
    """).method(args)


def case2():
    foo = ("""
a""").format(argument)


def case3():
    details = ("""%s
                  %s
               """) % (a, b)

to:

def case1():
    (
        """ this is a multi-line
    string that is pretty poorly formatted
    """
    ).method(args)


def case2():
    foo = (
        """
a"""
    ).format(argument)


def case3():
    details = (
        (
            """%s
                  %s
               """
        )
        % (a, b)
    )

Desired style (open to debate)

def case1():
    """ this is a multi-line
    string that is pretty poorly formatted
    """.method(args)


def case2():
    foo = """
a""".format(argument)


def case3():
    details = """%s
                  %s
               """ % (a, b)

Additional context

The desired style depends on GH-256 being resolved first.

The examples provided here are from instability issues: GH-958 & GH-954. The examples are no longer unstable, but their reformatted equivalents aren't good, hence this issue.

[0xallie]

Indeed, the current behavior is pretty awkward with sqlite3 statements.