title: how to put buttons above the button in kivy language and python class
body: <p>I want to put these buttons above the button (2) in grid layout to be like(0,1,2) with python language and without interrupt the kivy language that i typed i mean don't use for loop in kivy language</p>
  <pre><code>from kivy.lang.builder import Builder
  from kivy.app import App
  from kivy.uix.button import Button
  
  kv=Builder.load_string('''
  BoxLayout:
      GridLayout:
          id:grid_button
          cols:1
          Button:
              text:'2'
  ''')
  
  class Accounting(App):
      def build(self):
          return kv
      def on_start(self):
          for a in range(2):
  #I want to put these buttons above the button (2) in grid layout
              self.root.ids.grid_button.add_widget(Button(text=str(a)))
  
  Accounting().run()
  </code></pre>