[Tutor] constructors

[Sean 'Shaleh' Perry]

> 
> I say use a ctor (called __init__ in python) if you need/want to
> initialize the members of the object to some value when it is created.
> If you don't need/want that, then don't bother writing an empty one.
> I have found that most of the time you do want a ctor (though that
> may be my C++/Java background there).  You can use default arguments
> to allow for variations in usage.  For example :
> 

there are many times when there is no way to define a default version of an
object, so having a constructor makes sense.  This is especially true when you
are modelling the real world or your objects represent items.