old_contents: from kivy.uix.screenmanager import Screen
  from kivy.lang import Builder
  from kivy.app import App
  import webbrowser
  
  
  class ScreenFeedback(Screen):
      Builder.load_string('''
  <ScreenFeedback>
      name: 'ScreenFeedback'
  ''')
      def on_pre_enter(self):
          webbrowser.open('http://pydelhi.vkd.me/')
  
      def on_enter(self):
          app = App.get_running_app()
          app.go_back_in_history()
new_contents: from kivy.uix.screenmanager import Screen
  from kivy.lang import Builder
  from kivy.app import App
  import webbrowser
  
  
  class ScreenFeedback(Screen):
      Builder.load_string('''
  <ScreenFeedback>
      name: 'ScreenFeedback'
  ''')
      def on_pre_enter(self):
          webbrowser.open('https://feedback.pydelhi.org')
  
      def on_enter(self):
          app = App.get_running_app()
          app.go_back_in_history()
  
subject: Update screenfeedback.py