old_contents: """The polling mixin for controllers (poller) helps controllers to update the view based on changes in the model"""
  
  from julesTk.controller import Controller
  
  __author__ = "Joeri Jongbloets <joeri@jongbloets.net>"
  
  
  class Poller(Controller):
      """Poller; a polling controller"""
  
      def __init__(self, *args, **kwargs):
          super(Poller, self).__init__(*args, **kwargs)
          self._interval = 1  # in seconds
          self._polling = False  # whether the poller is active
  
      @property
      def interval(self):
          return self._interval
  
      @interval.setter
      def interval(self, v):
          self._interval = v
  
      def is_polling(self):
          return self._polling is True
  
      def set_polling(self, state):
          self._polling = state is True
  
      def setup(self):
          raise NotImplementedError
  
      def start(self):
          raise NotImplementedError
  
      def update(self, observable):
          raise NotImplementedError
  
      def run(self):
          """Runs the poller"""
          self.set_polling(True)
          self._update()
  
      def execute(self):
          raise NotImplementedError
  
      def _update(self):
          try:
              self.execute()
          except KeyboardInterrupt:
              self.set_polling(False)
          if self.is_polling():
              self.view.after(int(self._interval * 1000), self._update)
  
      def stop(self):
          self.set_polling(False)
          super(Poller, self).stop()
  
new_contents: """The polling mixin for controllers (poller) helps controllers to update the view based on changes in the model"""
  
  from julesTk.controller import Controller
  
  __author__ = "Joeri Jongbloets <joeri@jongbloets.net>"
  
  
  class Poller(Controller):
      """Poller; a polling controller"""
  
      def __init__(self, *args, **kwargs):
          super(Poller, self).__init__(*args, **kwargs)
          self._interval = 1  # in seconds
          self._polling = False  # whether the poller is active
  
      @property
      def interval(self):
          return self._interval
  
      @interval.setter
      def interval(self, v):
          self._interval = v
  
      def is_polling(self):
          return self._polling is True
  
      def set_polling(self, state):
          self._polling = state is True
  
      def setup(self):
          raise NotImplementedError
  
      def start(self):
          raise NotImplementedError
  
      def update(self, observable):
          raise NotImplementedError
  
      def run(self):
          """Runs the poller"""
          self.set_polling(True)
          self._update()
  
      def execute(self):
          raise NotImplementedError
  
      def _update(self):
          if self.is_polling():
              try:
                  self.execute()
              except KeyboardInterrupt:
                  self.set_polling(False)
              self.view.after(int(self._interval * 1000), self._update)
  
      def stop(self):
          self.set_polling(False)
          super(Poller, self).stop()
  
subject: remove quote