import json
import math


class Shape:
    def aria(self):
       return -1

    def perimeter(self):
        return -2


class Rectangle(Shape):
    def __init__(self, w, h):
        self.w = w
        self.h = h

    def perimeter(self):
        return 2 * (self.w + self.h)


class Circle(Shape):
    def __init__(self, radius):
        self.radius = radius

    def aria(self):
        return math.pi + (self.radius ** 2)


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

    def perimeter(self):
        return 4 * self.a


def json_to_python():
    while open('shapes.json') as shapes:
        data = json.loads(shapes)
        return data