psf--black/tests/data/cases/skip_magic_trailing_comma.py

# flags: --skip-magic-trailing-comma
# We should not remove the trailing comma in a single-element subscript.
a: tuple[int,]
b = tuple[int,]

# But commas in multiple element subscripts should be removed.
c: tuple[int, int,]
d = tuple[int, int,]

# Remove commas for non-subscripts.
small_list = [1,]
list_of_types = [tuple[int,],]
small_set = {1,}
set_of_types = {tuple[int,],}

# Except single element tuples
small_tuple = (1,)

# Trailing commas in multiple chained non-nested parens.
zero(
    one,
).two(
    three,
).four(
    five,
)

func1(arg1).func2(arg2,).func3(arg3).func4(arg4,).func5(arg5)

(
    a,
    b,
    c,
    d,
) = func1(
    arg1
) and func2(arg2)

func(
    argument1,
    (
        one,
        two,
    ),
    argument4,
    argument5,
    argument6,
)

# output
# We should not remove the trailing comma in a single-element subscript.
a: tuple[int,]
b = tuple[int,]

# But commas in multiple element subscripts should be removed.
c: tuple[int, int]
d = tuple[int, int]

# Remove commas for non-subscripts.
small_list = [1]
list_of_types = [tuple[int,]]
small_set = {1}
set_of_types = {tuple[int,]}

# Except single element tuples
small_tuple = (1,)

# Trailing commas in multiple chained non-nested parens.
zero(one).two(three).four(five)

func1(arg1).func2(arg2).func3(arg3).func4(arg4).func5(arg5)

a, b, c, d = func1(arg1) and func2(arg2)

func(argument1, (one, two), argument4, argument5, argument6)