Request for help

[alister]

On Tue, 19 Jul 2016 13:06:39 +1000, Steven D'Aprano wrote:

> On Tue, 19 Jul 2016 06:20 am, alister wrote:
> 
>> I suggest next time you stay awake during lessons.
> 
> That's an uncalled for nasty comment. You don't know the O.P's issues or
> why he is having difficulty.

because he has failed to provide any context.
the question as phrased looks exactly like a homework question a tutor 
would set after a lesson introducing classes



-- 
If you keep anything long enough, you can throw it away.