code: def update(self):
          
          # Init new stats
          stats = self.get_init_value()
  
          # Exist if we can not grab the stats
          if import_error_tag:
              return stats
  
          if self.input_method == 'local':
              # Update stats using the standard system lib
  
              # Grab network interface stat using the psutil net_io_counter method
              try:
                  netiocounters = psutil.net_io_counters(pernic=True)
              except UnicodeDecodeError:
                  return stats
  
              for net in netiocounters:
                  # Do not take hidden interface into account
                  if self.is_hide(net):
                      continue
  
                  # Grab the stats using the Wifi Python lib
                  try:
                      wifi_cells = Cell.all(net)
                  except InterfaceError as e:
                      # Not a Wifi interface
                      logger.debug("WIFI plugin: Scan InterfaceError ({})".format(e))
                      pass
                  except Exception as e:
                      # Other error
                      logger.debug("WIFI plugin: Can not grab cellule stats ({})".format(e))
                      pass
                  else:
                      for wifi_cell in wifi_cells:
                          hotspot = {
                              'key': self.get_key(),
                              'ssid': wifi_cell.ssid,
                              'signal': wifi_cell.signal,
                              'quality': wifi_cell.quality,
                              'encrypted': wifi_cell.encrypted,
                              'encryption_type': wifi_cell.encryption_type if wifi_cell.encrypted else None
                          }
                          # Add the hotspot to the list
                          stats.append(hotspot)
  
          elif self.input_method == 'snmp':
              # Update stats using SNMP
  
              # Not implemented yet
              pass
  
          # Update the stats
          self.stats = stats
  
          return self.stats
docs: Update Wifi stats using the input method.
  
          Stats is a list of dict (one dict per hotspot)
  
          :returns: list -- Stats is a list of dict (hotspot)