input: Write a function to swap the values of two variables. The function should return the new values of the variables after the swap.
  
  assert swap_values(5, 10) == (10, 5)
  assert swap_values(100, 200) == (200, 100)
  assert swap_values(0, -1) == (-1, 0)
  assert swap_values("a", "b") == ("b", "a")
  assert swap_values(True, False) == (False, True)
output: def swap_values(a, b):
      return b, a