Variable inheritance

[Oleg Broytmann]

On Tue, 22 May 2001, Roman Suzi wrote:
> I was always very irritated when somebody proposed something like
>
> class Line(Point):
>   ...
>
> just because line could be made of two points.

   Of course. Now THIS is bad design. Line IS NOT a point, hence, no
inheritance should occur. Line CONSISTS of two point, so

class Line:
   def __init__(self, p1, p2):
      self.p1 = p1
      self.p2 = p2

   But grey mouse DOES NOT "contains" grey color. The mouse IS really grey
thing, hence I used inheritance.

   This is difference between "thing IS a thing of the class" and "thing
CONTAINS things".

Oleg.
----
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.