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还在手写循环?16个Python高阶案例,让你的代码效率翻倍

  • 2026-06-27 21:26:09
还在手写循环?16个Python高阶案例,让你的代码效率翻倍

写Python时，想高效处理列表却只会写for循环？读取CSV文件还要手动关闭？计算斐波那契数列慢到怀疑人生？

今天整理的16个Python经典案例，专治各种“低效编码”。从列表推导式一行实现FizzBuzz，到装饰器缓存加速递归，再到requests一键爬取网页、itertools优雅组合数据……每个案例都是实际开发中的高频场景。

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  1. CONNECT:[ UseTime:0.000839s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000833s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009073s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.024633s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000864s ]
  6. SELECT * FROM `set` [ RunTime:0.000314s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000653s ]
  8. SELECT * FROM `article` WHERE `id` = 500641 LIMIT 1 [ RunTime:0.012934s ]
  9. UPDATE `article` SET `lasttime` = 1783011285 WHERE `id` = 500641 [ RunTime:0.003276s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003335s ]
  11. SELECT * FROM `article` WHERE `id` < 500641 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.018499s ]
  12. SELECT * FROM `article` WHERE `id` > 500641 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.027693s ]
  13. SELECT * FROM `article` WHERE `id` < 500641 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.063516s ]
  14. SELECT * FROM `article` WHERE `id` < 500641 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.035227s ]
  15. SELECT * FROM `article` WHERE `id` < 500641 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.116568s ]
0.483664s