def dist_task(f):
    f.is_dist_task = True


class Foo(object):
    @dist_task
    def install(self):
        pass

    @property
    def dist_tasks(self):
        return {
            x: getattr(self, x)
            for x in dir(self)
            if isroutine(getattr(self, x))
            and getattr(getattr(self, x), 'is_dist_task', False)]
        }