class printers(Screen,Button,GridLayout):
    box = ObjectProperty(None)

    def on_box(self, *args):
        pop = populateinfo()
        num = []
        name = requests.get("https://productinfo-66c98.firebaseio.com/.json")
        name = json.loads(name.text)
        count = name["Count"]
        for i in range(count+1):
            try:
                if name[str(i)]["Box"].capitalize() != "":
                    num.append(i)
            except KeyError:
                i += 1
        a = lambda a: a+1
        for i in num:
            title = name[str(i)]["Model"]
            sticker = str(i)+" "
            self.box.add_widget(Button(text=sticker+title,id=str(i),height=40,size_hint_y=None,on_release=a(int(i))))