python高级写法学习

plugin_container, class_container, base_class = {
   'trigger': (self._trigger_plugins, self._trigger_classes, BaseTrigger),
   'jobstore': (self._jobstore_plugins, self._jobstore_classes, BaseJobStore),
   'executor': (self._executor_plugins, self._executor_classes, BaseExecutor)
}[type_]

首先是定义一个字典，取字典的value，然后是元组解压 。

也就是说，type_的值只能是trigger、jobstore、executor，

plugin_container, class_container, base_class的值将是self.xx_plugins, self.xx_classes, xx

例如：type_='executor',

那么plugin_container, class_container, base_class=(self._executor_plugins, self._executor_classes, BaseExecutor)