input: Write a function to swap the values of two variables using Python.
  
  def swap_two_variables(x, y):
      x, y = y, x
      return (x, y)
  
  assert swap_two_variables(5, 10)==(10, 5)
  assert swap_two_variables(0, 0)==(0, 0)
  assert swap_two_variables("a", "b")==("b", "a")
  assert swap_two_variables(True, False)==(False, True)
output: def swap_two_variables(x, y):
      x, y = y, x
      return (x, y)