text: """[Practice: Light Switch]
      Variable name       class name
      ("instance")
          ice         =       Ice)
  
      Constructor
  class ice:
      def __init__(self):
              body
          print("HI")  # is an expression
  
  
  
  """
  class Light:
      def __init__(self):
          print("Creating light")
      def toggle(self):
          print("Toggle on and off")
          self.on = not self.on
  
      def is_on(sel):
          return self.on
  
  