当前位置:网站首页>collections.defaultdict()的使用
collections.defaultdict()的使用
2022-06-28 02:07:00 【xx_xjm】
这个函数和常用的dict之间的区别在于,它可以给新键赋予一个默认变量:
如下所示,我们自定义一个类,此时把其作为变量传递给defaultdict,则此时的d相当于是一个初始化的字典

此时我们给这个字典赋予一个新的key如下:可以看见这个新的key的value就是我们自己设置的这个类。

我们调用这个类的方法,结果如下

边栏推荐
- 音视频技术开发周刊 | 251
- Basic flask: template rendering + template filtering + control statement
- 剑指 Offer 47. 礼物的最大价值(DP)
- adb双击POWER键指令
- Apache - about Apache
- [games] Parkour
- 为什么大厂压力大,竞争大,还有这么多人热衷于大厂呢?
- 腾讯游戏发布40多款产品与项目 其中12款为新游戏
- Gateway microservice routing failed to load microservice static resources
- Feign远程调用fallback回调失败,无效果
猜你喜欢

Thesis reading: General advantageous transformers

Domain Name System

Writing based on stm32

Initial linear regression

业内首个!可运行在移动设备端的视频画质主观体验MOS分评估模型!

Brief history and future trend of codeless software

Tencent games released more than 40 products and projects, including 12 new games

空闲中断无法清除

剑指 Offer 53 - I. 在排序数组中查找数字 I(改进二分)

CI & CD 不可不知!
随机推荐
apache、iis6、ii7独立ip主机屏蔽拦截蜘蛛抓取(适用vps云主机服务器)
How fiddle uses agents
The first in the industry! MOS sub evaluation model for subjective video quality experience that can run on mobile devices!
测试要掌握的技术有哪些?软件测试必懂的数据库设计大全篇
RichView TRVStyle TextStyles
腾讯游戏发布40多款产品与项目 其中12款为新游戏
[today in history] June 20: the father of MP3 was born; Fujitsu was established; Google acquires dropcam
js清空对象和对象的值:
如何编写简洁代码?(上)
[today in history] June 24: Netease was established; The first consumer electronics exhibition was held; The first webcast in the world
Is it safe to buy stocks and open an account through the account opening link of the broker manager? Want to open an account for stock trading
TensorRT 模型推理优化实现
Severe Tire Damage:世界上第一个在互联网上直播的摇滚乐队
ETCD数据库源码分析——集群间网络层服务端RaftHandler
为什么大厂压力大,竞争大,还有这么多人热衷于大厂呢?
CMU提出NLP新范式—重构预训练,高考英语交出134高分
导致系统性能失败的十个原因
买股票应该下载什么软件最好最安全?
Is it reliable to invest in the inter-bank certificate of deposit fund? Is the inter-bank certificate of deposit fund safe
[today in history] June 23: Turing's birthday; The birth of the founder of the Internet; Reddit goes online