Find some commandline flags which accomplishes this (e.g. read on stdin and write to stdout, or possibly read some tempfile and write back out to it)

black --code "$text"

demo

$ cat source.py
from seven_dwwarfs import Grumpy, Happy, Sleepy, Bashful, Sneezy, Dopey, Doc
x = {  'a':37,'b':42,

'c':927}

x = 123456789.123456789E123456789

if very_long_variable_name is not None and \
 very_long_variable_name.field > 0 or \
 very_long_variable_name.is_debug:
 z = 'hello '+'world'
else:
 world = 'world'
 a = 'hello {}'.format(world)
 f = rf'hello {world}'
if (this
and that): y = 'hello ''world'#FIXME: https://github.com/python/black/issues/26
class Foo  (     object  ):
  def f    (self   ):
    return       37*-2
  def g(self, x,y=42):
      return y
def f  (   a: List[ int ]) :
  return      37-a[42-u :  y**3]
def very_important_function(template: str,*variables,file: os.PathLike,debug:bool=False,):
    """Applies `variables` to the `template` and writes to `file`."""
    with open(file, "w") as f:
     ...
# fmt: off
custom_formatting = [
    0,  1,  2,
    3,  4,  5,
    6,  7,  8,
]
# fmt: on
regular_formatting = [
    0,  1,  2,
    3,  4,  5,
    6,  7,  8,
]
$ black --code "$(<source.py)"
from seven_dwwarfs import Grumpy, Happy, Sleepy, Bashful, Sneezy, Dopey, Doc

x = {"a": 37, "b": 42, "c": 927}

x = 123456789.123456789e123456789

if (
    very_long_variable_name is not None
    and very_long_variable_name.field > 0
    or very_long_variable_name.is_debug
):
    z = "hello " + "world"
else:
    world = "world"
    a = "hello {}".format(world)
    f = rf"hello {world}"
if this and that:
    y = "hello " "world"  # FIXME: https://github.com/python/black/issues/26


class Foo(object):
    def f(self):
        return 37 * -2

    def g(self, x, y=42):
        return y


def f(a: List[int]):
    return 37 - a[42 - u : y ** 3]


def very_important_function(
    template: str, *variables, file: os.PathLike, debug: bool = False,
):
    """Applies `variables` to the `template` and writes to `file`."""
    with open(file, "w") as f:
        ...


# fmt: off
custom_formatting = [
    0,  1,  2,
    3,  4,  5,
    6,  7,  8,
]
# fmt: on
regular_formatting = [
    0,
    1,
    2,
    3,
    4,
    5,
    6,
    7,
    8,
]

$

Feature request: Add support for python Black #403

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