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Python:NaN凭什么不等于自己?

  • 2026-02-22 08:11:38
Python:NaN凭什么不等于自己?

Python：NaN凭什么不等于自己？

当你写下 NaN == NaN，Python 却回答你“不”时，你就踏入了一个迷人的编程哲学地带。
读懂NaN，是理解计算机如何处理不确定性、如何在精确的二进制世界中为“未知”留下位置的关键一课。
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  1. CONNECT:[ UseTime:0.001051s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001596s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000714s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000632s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001272s ]
  6. SELECT * FROM `set` [ RunTime:0.000587s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001440s ]
  8. SELECT * FROM `article` WHERE `id` = 475843 LIMIT 1 [ RunTime:0.000814s ]
  9. UPDATE `article` SET `lasttime` = 1772253715 WHERE `id` = 475843 [ RunTime:0.010286s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000667s ]
  11. SELECT * FROM `article` WHERE `id` < 475843 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001019s ]
  12. SELECT * FROM `article` WHERE `id` > 475843 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000960s ]
  13. SELECT * FROM `article` WHERE `id` < 475843 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001577s ]
  14. SELECT * FROM `article` WHERE `id` < 475843 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018192s ]
  15. SELECT * FROM `article` WHERE `id` < 475843 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002420s ]
0.132184s