text: >>> class MyClassName:
  	__private = 123
  	non_private = __private * 2
  
  	
  >>> mine = MyClassName()
  >>> mine.non_private
  246
  >>> mine.__private
  Traceback (most recent call last):
    File "<pyshell#23>", line 1, in <module>
      mine.__private
  AttributeError: 'MyClassName' object has no attribute '__private'
  >>> mine._MyClassName__private
  123
  >>>
  