Basically, this is something that you never ever use. However, there are rare cases where it might be fun to use anyway. Here's how you can use it for implementing some weapons for a very simple game:

from states import StatefulObject
import time

class Reloading(object):
    @staticmethod
    def reload(self):
        pass

    @staticmethod
    def fire(self):
        if time.time() > self.reload_start_time:
            self.popState()
            self.fire()

        print 'Can not fire while reloading.'

class Empty(object):
    @staticmethod
    def reload(self):
        print('No ammo to load!')

    @staticmethod
    def fire(self):
        if self.ammo_remaining > 0:
            self.popState()
            self.fire()
        else:
            print('Can not fire while out of ammo.')

class Weapon(StatefulObject):
    damage = 20
    ammo_remaining = 75
    ammo_in_clip = 25

    reload_time = 500

    auto_reload = True
    reload_class = Reloading
    empty_class = Empty

    def reload(self):
        self.reload_start_time = time.time()
        self.pushState(self.reload_class)

    def fire(self):
        print('Firing {0} for {1} damage.'.format(self.__class__.__name__, self.damage)

        self.ammo_remaining -= 1
        self.ammo_in_clip -= 1

        if self.ammo_remaining == 0:
            self.pushState(self.empty_class)

        elif self.ammo_remaining == 0 and self.auto_reload:
            self.reload()

class RocketLauncher(Weapon):
    damage = 100

    ammo_remaining = 15
    ammo_in_clip = 2

    reload_time = 1800