Re: Différence avec Python ?

Ruby

class Rectangle
 include Comparable
 attr_reader :width, :height
 def initialize(w, h)
 @width, @height = w, h
 end
 def <=>(o)
 [@width, @height] <=> [o.width, o.height]
 end
end
class Square < Rectangle
 def initialize(side)
 @width = @height = side
 end
 def <=>(o)
 if o.type == Square
 @width <=> o.width
 else
 o <=> self
 end
 end
end

Python

class Rectangle:
 def width(self):
 return self.__width
 def height(self):
 return self.__height
 def __init__(self, w, h):
 self._width, self.__height = w, h
 def __cmp__(self, o):
 return cmp(
 [self._width, self.__height],
 [o.width(), o.height()])
class Square(Rectangle):
 def __init__(self, side):
 self._width = self.__height = side
 def __cmp__(self, o):
 if isinstance(o, Square):
 return cmp(self.__width, o.width())
 else:
 return o.__cmp__(self)

Merci à Lucas pour l'exemple ;-)