def test_flatten():
in_list = [[1, 2, 3], [4], [[5, 6], 7], 8]
flat = flatten(in_list)
assert flat == [1, 2, 3, 4, 5, 6, 7, 8]
back = unflatten(flat, in_list)
assert in_list == back
new_list = [2, 3, 4, 5, 6, 7, 8, 9]
back = unflatten(new_list, in_list)
assert back == [[2, 3, 4], [5], [[6, 7], 8], 9]
flat = flatten([])
assert flat == []
back = unflatten([], [])
assert back == []
def test_flatten():
in_list = [[1, 2, 3], [4], [[5, 6], 7], 8]
flat = flatten(in_list)
assert flat == [1, 2, 3, 4, 5, 6, 7, 8]
back = unflatten(flat, in_list)
assert in_list == back
new_list = [2, 3, 4, 5, 6, 7, 8, 9]
back = unflatten(new_list, in_list)
assert back == [[2, 3, 4], [5], [[6, 7], 8], 9]
flat = flatten([])
assert flat == []
back = unflatten([], [])
assert back == []
def test_flatten():
in_list = [[1, 2, 3], [4], [[5, 6], 7], 8]
flat = flatten(in_list)
yield assert_equal, flat, [1, 2, 3, 4, 5, 6, 7, 8]
back = unflatten(flat, in_list)
yield assert_equal, in_list, back
new_list = [2, 3, 4, 5, 6, 7, 8, 9]
back = unflatten(new_list, in_list)
yield assert_equal, back, [[2, 3, 4], [5], [[6, 7], 8], 9]
flat = flatten([])
yield assert_equal, flat, []
back = unflatten([], [])
yield assert_equal, back, []
def test_flatten():
in_list = [[1, 2, 3], [4], [[5, 6], 7], 8]
flat = flatten(in_list)
yield assert_equal, flat, [1, 2, 3, 4, 5, 6, 7, 8]
back = unflatten(flat, in_list)
yield assert_equal, in_list, back
new_list = [2, 3, 4, 5, 6, 7, 8, 9]
back = unflatten(new_list, in_list)
yield assert_equal, back, [[2, 3, 4], [5], [[6, 7], 8], 9]
flat = flatten([])
yield assert_equal, flat, []
back = unflatten([], [])
yield assert_equal, back, []