input: Write a function to swap the values of two variables in Python. The function should take two variables as input arguments and return them in swapped order. After the swap, the first variable should have the value of the second variable, and the second variable should have the value of the first variable.
  
  assert swap_variables(5, 10)==(10, 5)
  assert swap_variables(0, -1)==(-1, 0)
  assert swap_variables("a", "b")==("b", "a")
  assert swap_variables([1, 2], [3, 4])==([3, 4], [1, 2])
  assert swap_variables(True, False)==(False, True)
output: def swap_variables(a, b):
      return b, a