code: def _update(self):
          
          update = not self._reminders
  
          with self._lock:
              for fname in self._reminders:
                  if getmtime(fname) > self._mtime:
                      update = True
                      break
  
              if update:
                  self._reminders = self._parse_remind(self._filename)
docs: Reload Remind files if the mtime is newer