# Python has no interfaces
# therefore, the example uses abstract classes
from abc import *


class Shape(ABC):
    @abstractmethod
    def get_area(self):
        pass

    @property
    @abstractmethod
    def line_count(self):
        return 0


class Square(Shape):
    def __init__(self, s_length):
        self.sideLength = s_length

    def get_area(self):
        return self.sideLength * self.sideLength

    @property
    def line_count(self):
        return 4


square = Square(5)
area = square.get_area()
# area is 25

print(area)