def add_udev_trigger(self, trigger_action, subsystem):
if self._py3_wrapper.udev_monitor.subscribe(self, trigger_action, subsystem):<EOL><INDENT>if trigger_action == "<STR_LIT>":<EOL><INDENT>self.module_class.cache_timeout = PY3_CACHE_FOREVER<EOL><DEDENT><DEDENT>
Subscribe to the requested udev subsystem and apply the given action.