Python declarative

[Sergio Tortosa Benedito]

Hi I'm developing a sort of language extension for writing GUI programs
called guilang, right now it's written in Lua but I'm considreing Python
instead (because it's more tailored to alone applications). My question
it's if I can achieve this declarative-thing in python. Here's an
example:

Window "myWindow" {
	title="Hello world";
	Button "myButton" {
		label="I'm a button";
		onClick=exit
	}
}
print(myWindow.myButton.label)

Of course it doesn't need to be 100% equal. Thanks in advance

Sergio