【進階應用】星星樹

				
					class Shape:
    def __init__(self, level):
        self._level = level

    def show(self):
        pass

class Pyramid(Shape):
    def show(self):
        for i in range(1, self._level + 1):
            print(' ' * (self._level - i) + '*' * (2 * i))


class RPyramid(Shape):
    def show(self):
        for i in range(1, self._level + 1):
            print(' ' * (i - 1) + '*' * (2 * (self._level + 1 - i)))


class Square(Shape):
    def show(self):
        for _ in range(self._level):
            print('*' * (2 * self._level))


class Rectangle(Shape):
    def show(self):
        for _ in range(self._level):
            print(' ' * (self._level - 1) + '*' * 2)


def main():
    level = int(input('請輸入層數(level)，可產生4*level層星狀樹：'))

    shapes = [Pyramid(level), Square(level), RPyramid(level), Rectangle(level)]

    for shape in shapes:
        shape.show()

if __name__ == "__main__":
    main()