input: Write a function to swap the values of two variables and print the result after swapping. The function should take two parameters, 'x' and 'y', and return the swapped values.
  assert swap_values(5, 10)==(10, 5)
  assert swap_values(0, 0)==(0, 0)
  assert swap_values(-5, 5)==(5, -5)
  assert swap_values(3.5, 2.1)==(2.1, 3.5)
  assert swap_values(1, 'a')==('a', 1)
output: def swap_values(x, y):
      x, y = y, x
      return x, y