numpy_rectangle.py

from typing import Type, TypeVar, Union
import numpy as np


Number = TypeVar("TypeVar", int, float)


class Rectangle(np.ndarray):
    def __new__(
        cls,
        x: Number,
        y: Number,
        width: Number,
        height: Number,
    ) -> Type["Rectangle"]:
        return np.asarray([x, y, width, height]).view(cls)

    def resize(
        self,
        width_scale: Number,
        height_scale: Number,
    ) -> "Rectangle":
        rectangles = self.reshape((-1, 4))
        rectangles = rectangles * (
            width_scale, height_scale, width_scale, height_scale,
        )
        rectangles = rectangles.reshape(self.shape)
        return rectangles


rs = np.asarray([
    (10, 20, 30, 40.5),
    (10, 20, 30, 40),
    (10, 20, 30, 40),
    (10, 20, 30, 40),
]).view(Rectangle)
print(rs.resize(0.5, 0.5))
print(rs * 2)