using PythonCall

Rectangle = pytype("Rectangle", (), [
    "__module__" => "__main__",

    pyfunc(
        name = "__init__",
        function (self, length, width)
            self.length = length
            self.width = width
            return
        end
    ),

    pyfunc(
        name = "area",
        self -> self.length * self.width
    ),

    pyfunc(
        name = "perimeter",
        self -> 2 * self.length + 2 * self.width
    ),
])

Square = pytype("Square", (Rectangle,), [
    "__module__" => "__main__",

    pyfunc(
        name = "__init__",
        function (self, length)
            super().__init__(length, length)
            return
        end
    )
])