lecture-13 - Recap Inheritance class Shape def draw(self...

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1 Recap: Inheritance class Shape: def draw(self, screen): # some python code here def erase(self, screen): screen.setcolor(“white”) self.draw(screen) screen.setcolor(“black”) class Rec(Shape): def draw(self, screen): # some python code here class Oval(Shape): def draw(self, screen): # some python code here Recap: Complex numbers class Real: RealPart = 0 class Complex: RealPart = 0 ComplexPart = 0 The same exact options present themselves here, with the same tradeoffs! Summary of (single) inheritance • Inheritance is a powerful mechanism • From the programmer’s perspective, difficulty is in defining the inheritance diagram • From a language implementer’s perspective, difficulty is in making dynamic dispatch work Multiple inheritance class ColorTextBox(ColorBox,TextPoint): def draw(self,screen,pos): ColorBox.draw(self,screen,pos) r=TextPoint.draw(self,screen,pos) return r def __str__(self): return ColorBox.__str__(self) + " text: " + str(self.text) What are the issues?
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