Kivy循环创建多组按钮与对应标签并绑定点击计数功能的实现问题

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.properties import NumericProperty

class MainWidget(GridLayout):
    label_string1 = NumericProperty(0)
    label_string2 = NumericProperty(0)
    label_string3 = NumericProperty(0)

    def __init__(self, **kwargs):
        super(MainWidget, self).__init__(**kwargs)
        self.cols = 2
        # 存储序号对应标签实例的映射字典
        self.label_map = {}
        for i in range(1, 4):
            btn = Button(text=str(i))
            # 给按钮自定义属性存对应序号
            btn.idx = i
            self.add_widget(btn)
            lab = Label(text="0")
            self.label_map[i] = lab
            self.add_widget(lab)
            btn.bind(on_press=self.btn_clicked)

    def btn_clicked(self, instance):
        # 拿到当前按钮对应序号
        idx = instance.idx
        # 动态获取对应的NumericProperty当前值
        current_val = getattr(self, f"label_string{idx}")
        # 计算新值
        new_val = current_val + int(instance.text)
        # 动态更新对应的NumericProperty
        setattr(self, f"label_string{idx}", new_val)
        # 更新对应标签的文本
        self.label_map[idx].text = str(new_val)


class ButtonWidgetApp(App):
    def build(self):
        return MainWidget()

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

• 动态属性操作：Python中不能直接用self.label_string + val的形式拼接变量名访问属性，改用内置的getattr()和setattr()方法就可以通过字符串格式的属性名，动态操作你预先定义的多个NumericProperty
• 关联逻辑简化：放弃原来复杂的ids存储方式，直接给按钮实例增加自定义的idx属性存储对应组的序号，同时用label_map字典存储序号和对应标签实例的映射，点击按钮后可以直接通过序号快速定位到需要操作的属性和标签，逻辑更清晰不易出错
• 补全了Kivy应用运行必要的导入和App类的build方法，代码可直接运行

内容的提问来源于stack exchange，提问作者Hippo