input: Write a function to swap the values of two variables. The function should take two parameters, `x` and `y`, and return the swapped values of `x` and `y`.
  assert swap_values(5, 10) == (10, 5)
  assert swap_values(1, 2) == (2, 1)
  assert swap_values('a', 'b') == ('b', 'a')
  assert swap_values(True, False) == (False, True)
  assert swap_values([1, 2], [3, 4]) == ([3, 4], [1, 2])
output: def swap_values(x, y):
      return y, x