input: Write a function to swap the values of two variables in Python.
  assert swap_values(x=5, y=10) == (10, 5)
  assert swap_values(x=2, y=3) == (3, 2)
  assert swap_values(x=-1, y=-2) == (-2, -1)
  assert swap_values(x="a", y="b") == ("b", "a")
  assert swap_values(x=True, y=False) == (False, True)
output: def swap_values(x, y):
      return y, x