code: def completion(self, device, folder):
          
          return self.get(
              'completion',
              params={'folder': folder, 'device': device}
          ).get('completion', None)
docs: Returns the completion percentage (0 to 100) for a given device
              and folder.
  
              Args:
                  device (str): The Syncthing device the folder is syncing to.
                  folder (str): The folder that is being synced.
  
              Returs:
                  int