input: Write a function to swap the values of two variables in Python. The function should take two variables as input and print their swapped values.
  
  x = 5
  y = 10
  
  assert swap_variables(x, y) == "x: 10\ny: 5"
  assert swap_variables(7, 3) == "x: 3\ny: 7"
  assert swap_variables(0, 0) == "x: 0\ny: 0"
  assert swap_variables(-1, 1) == "x: 1\ny: -1"
  assert swap_variables("a", "b") == "x: b\ny: a"
output: def swap_variables(x, y):
      x, y = y, x
      return f"x: {x}\ny: {y}"