Comment by HaroldCindy

I wasn't aware that single-file Java without a top-level static class was possible now, that + JBang seems quite useful for small tasks.

One nit:

> Python programmers often use ad-hoc dictionaries (i.e. maps) to aggregate related information. In Java, we have records:

In modern Python it's much more idiomatic to use a `typing.NamedTuple` subclass or `@dataclasses.dataclass` than a dictionary. The Python equivalent of the Java example:

    @dataclasses.dataclass
    class Window:
        id: int
        desktop: int
        x: int
        y: int
        width: int
        height: int
        title: str

        @property
        def xmax(self) -> int: return self.x + self.width

        @property
        def ymax(self) -> int: return self.y + self.height


    w = Window(id=1, desktop=1, x=10, y=10, width=100, height=100, title="foo")