kivy properties

propdemo.py

import kivy
kivy.require('1.8.0')

import random

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.event import EventDispatcher
from kivy.properties import NumericProperty

class Actor(EventDispatcher):
    health = NumericProperty(100)
    attack = NumericProperty(10)
    mana = NumericProperty(20)

class TestApp(App):
    def build(self):
        root = BoxLayout(orientation='vertical')
        self.actors = []
        for i in range(14):
            root.add_widget(self.create_actor_box())
        btn = Button(text='Change')
        root.add_widget(btn)
        btn.bind(on_press=self.change)
        self.change()
        return root

    def create_actor_box(self):
        actor = Actor()
        self.actors.append(actor)
        box = BoxLayout()
        lhealth = Label()
        lattack = Label()
        lmana = Label()
        box.add_widget(lhealth)
        box.add_widget(lattack)
        box.add_widget(lmana)
        actor.bind(health=lambda a, v: setattr(lhealth, 'text', str(v)),
                   attack=lambda a, v: setattr(lattack, 'text', str(v)),
                   mana=lambda a, v: setattr(lmana, 'text', str(v)))
        return box

    def change(self, *args):
        for actor in self.actors:
            actor.health = random.randint(0, 100)
            actor.attack = random.randint(5, 15)
            actor.mana = random.randint(0, 20)

if __name__ == '__main__':
    TestApp().run()