title: How to write popup in kv file when one press button
body: <pre><code>from kivy.app import App
  from kivy.uix.widget import Widget
  from kivy.uix.button import Button
  from kivy.uix.popup import Popup
  from kivy.factory import Factory
  
  class My3App(App):
      def build(self):
          return Hello()
  
  
  class Hello(Widget):
      def btn(self):
          pass
  
  
  if __name__ == "__main__":
      My3App().run()
  
  
  
  kv File
  
  &lt;Hello&gt;:
      Button:
          text : "button1"
          on_press : root.btn()
  </code></pre>
  
  <p>How do I create a Popup when I click on button1? I want a large popup which contains so many buttons and labels. How do I write that popup in kv language?</p>
  
  <p>Thanks in advance</p>