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Python装饰器其实就是一个“嵌套函数”而已

  • 2026-06-29 02:43:48
Python装饰器其实就是一个“嵌套函数”而已

装饰器

  • 装饰器就像一个给手机套壳的过程：手机（原函数）的功能不变，但套上壳（装饰器）后，多了防摔、支架等额外功能。
  • 核心逻辑：装饰器是一个接收函数、返回新函数的“函数加工厂”。
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  1. CONNECT:[ UseTime:0.000371s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000553s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000406s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007906s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000600s ]
  6. SELECT * FROM `set` [ RunTime:0.002851s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000744s ]
  8. SELECT * FROM `article` WHERE `id` = 488454 LIMIT 1 [ RunTime:0.002206s ]
  9. UPDATE `article` SET `lasttime` = 1783139283 WHERE `id` = 488454 [ RunTime:0.009290s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.004780s ]
  11. SELECT * FROM `article` WHERE `id` < 488454 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005092s ]
  12. SELECT * FROM `article` WHERE `id` > 488454 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015865s ]
  13. SELECT * FROM `article` WHERE `id` < 488454 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.027762s ]
  14. SELECT * FROM `article` WHERE `id` < 488454 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018731s ]
  15. SELECT * FROM `article` WHERE `id` < 488454 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.040284s ]
0.233818s