Python协程中使用上下文

obj_ref_dict obj-6: <A|x: 6> in obj_ref_dict obj-7: <A|x: 7> in obj_ref_dict obj-8: <A|x: 8> in obj_ref_dict obj in obj_ref_dict obj-6: None in obj_ref_dict obj-7: None in obj_ref_dict obj-8: None in obj_ref_dict obj