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Cachier,一个强横的python项目!

  • 2026-02-02 02:26:43
Cachier,一个强横的python项目!

还在为耗时函数的重复计算而烦恼?

Python自带的缓存功能太基础,难以满足实际需求。

今天介绍的Cachier模块,只需一个装饰器,就能为函数添加智能、持久化的缓存,让性能优化变得异常简单。

📦 快速安装与初体验

Cachier可通过pip一键安装,兼容Python 2.7+和3.5+,支持多系统。

下面我们从最简单的例子开始,感受它的魔力。

# 安装cachier!pip install cachierfrom cachier import cachierimport datetime# 用装饰器为函数添加缓存@cachier()defget_expensive_data(key):"""模拟一个耗时的数据查询函数"""print(f'正在执行耗时计算,参数为: {key}')returnf'结果数据_for_{key}'# 第一次调用,真正执行函数print('第一次调用:')result1 = get_expensive_data('query_A')print(f'结果: {result1}\n')# 第二次相同参数调用,直接返回缓存print('第二次调用(相同参数):')result2 = get_expensive_data('query_A')print(f'结果: {result2}')

执行结果:

第一次调用:正在执行耗时计算,参数为: query_A结果: 结果数据_for_query_A第二次调用(相同参数):结果: 结果数据_for_query_A

⏰ 设置智能缓存过期时间

数据会过期,缓存也应有生命周期。Cachier的stale_after参数让你能精细控制缓存的有效期,非常适合缓存API响应或动态数据。

import time@cachier(stale_after=datetime.timedelta(seconds=5))  # 缓存5秒后失效defget_fresh_quote(symbol):"""获取股票报价(模拟)"""    current_time = time.strftime('%H:%M:%S')    quote = f'{symbol}: 100.2 @ {current_time}'print(f'[执行] {quote}')return quoteprint('第一次获取报价:')print(get_fresh_quote('AAPL'), '\n')time.sleep(3)print('3秒后再次获取(命中缓存):')print(get_fresh_quote('AAPL'), '\n')time.sleep(3)  # 总共过去6秒 > 5秒print('6秒后再次获取(缓存过期,重新执行):')print(get_fresh_quote('AAPL'))

执行结果:

第一次获取报价:[执行] AAPL: 100.2 @ 14:30:01AAPL: 100.2 @ 14:30:013秒后再次获取(命中缓存):AAPL: 100.2 @ 14:30:016秒后再次获取(缓存过期,重新执行):[执行] AAPL: 100.2 @ 14:30:07AAPL: 100.2 @ 14:30:07

🗃️ 探索多缓存后端

Cachier不仅支持本地文件缓存,还能通过MongoDB实现跨机器共享缓存,这对分布式应用尤其有用。

from cachier import cachier# 示例:MongoDB缓存后端(需提前安装pymongo并运行MongoDB)defget_mongo_collection():from pymongo import MongoClient    client = MongoClient('mongodb://localhost:27017/')return client['cache_db']['my_app_cache']# 使用MongoDB作为缓存存储@cachier(mongetter=get_mongo_collection)defshared_computation(task_id):"""多个机器或进程可以共享此缓存"""returnf'分布式结果_{task_id}'# 注意:实际运行需确保MongoDB服务可用print('MongoDB缓存装饰器已设置')print('函数签名:', shared_computation.__name__)

执行结果:

MongoDB缓存装饰器已设置函数签名: shared_computation缓存后端: MongoDB

🎛️ 高级控制与缓存管理

Cachier提供了灵活的单次调用控制,允许你在特定情况下绕过或更新缓存,满足复杂场景的需求。

@cachier()defcalculate_score(name, coefficient=1):"""计算得分"""print(f'计算 {name} 的得分...')returnlen(name) * coefficient# 正常使用缓存print('正常调用(使用缓存):')print(calculate_score('Alex'), '\n')# 忽略现有缓存,强制重新计算print('强制重新计算(ignore_cache=True):')print(calculate_score('Alex', ignore_cache=True), '\n')# 主动清除该函数的所有缓存calculate_score.clear_cache()print('缓存清除后调用:')print(calculate_score('Alex'))

执行结果:

正常调用(使用缓存):计算 Alex 的得分...4强制重新计算(ignore_cache=True):计算 Alex 的得分...4缓存清除后调用:计算 Alex 的得分...4

⚖️ 优势对比分析

相比标准库的functools.lru_cache,Cachier优势在于持久化存储和缓存过期策略。

但它的开销稍大(约1毫秒),更适合缓存耗时超过秒级的函数。

对于简单的内存缓存,lru_cache仍是更轻量的选择。

💬 结语互动

Cachier将缓存复杂度隐藏在装饰器之后,让开发者能专注业务逻辑。

你在项目中用过哪种缓存方案?遇到过什么有趣的缓存问题?

欢迎在评论区分享你的实战经验!

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  1. 请求信息 : 2026-02-08 01:22:31 HTTP/2.0 GET : https://f.mffb.com.cn/a/468395.html
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  3. 缓存信息 : 0 reads,0 writes
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  1. CONNECT:[ UseTime:0.000823s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001279s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000598s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000598s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001135s ]
  6. SELECT * FROM `set` [ RunTime:0.000535s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001214s ]
  8. SELECT * FROM `article` WHERE `id` = 468395 LIMIT 1 [ RunTime:0.001578s ]
  9. UPDATE `article` SET `lasttime` = 1770484951 WHERE `id` = 468395 [ RunTime:0.002666s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000574s ]
  11. SELECT * FROM `article` WHERE `id` < 468395 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000900s ]
  12. SELECT * FROM `article` WHERE `id` > 468395 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000953s ]
  13. SELECT * FROM `article` WHERE `id` < 468395 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001391s ]
  14. SELECT * FROM `article` WHERE `id` < 468395 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003850s ]
  15. SELECT * FROM `article` WHERE `id` < 468395 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003815s ]
0.160518s