Abstract attributes in Python

Question

What is the shortest / most elegant way to implement the following Scala code with an abstract attribute in Python?

abstract class Controller {

    val path: String

}

A subclass of Controller is enforced to define "path" by the Scala compiler. A subclass would look like this:

class MyController extends Controller {

    override val path = "/home"

}

Answer 1

Python has a built-in exception for this, though you won't encounter the exception until runtime.

class Base(object):
    @property
    def path(self):
        raise NotImplementedError


class SubClass(Base):
    path = 'blah'