VODWPython/Example3 | Python Fiddle

##import ABstract class and abstractmethods for defining interfaces
from abc import ABCMeta, abstractmethod

### creating an virtual class with no constructor but with a metaclass and define all methods which are valid in this ABC
class Shape(object):
    __metaclass__ = ABCMeta
    
    @abstractmethod
    def draw(self):
        print("Shape printed with n number of points, not specified how much")
    
    def erase(self):
        print("Shape erased")

##creating an concrete class based on ABC Shape
class Circle(Shape):
    def draw(self):
        print("Circle printed! with endless points")
    def erase(self):
        print("Circle will not be erased. It always exist")

class Square(Shape):
    def draw(self):
        print("Square printed! with four points")

class Triangle(Shape):
    def draw(self):
        print("Triangle printed! with three points")
  
    
###create losts of differents shapes and call draw which is implemented in different ways        
def tryPoly():
    
   ##set up a list of shapes
    listshapes = [Circle(), Circle(), Square(), Square(), Circle(), Square(), Triangle(), Triangle()]
    
    for each in listshapes:
        each.draw()
        each.erase()

tryPoly()

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