Python协程中使用上下文

obj_ref_dict obj-1: <A|x: 1> in obj_ref_dict obj-2: <A|x: 2> in obj_ref_dict obj-3: <A|x: 3> in obj_ref_dict obj in obj_ref_dict obj-1: None in obj_ref_dict obj-2: None in obj_ref_dict obj-3: None in obj_ref_dict obj