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Python 库入门:import 用法 + 常用库

  • 2026-07-02 16:38:08
Python 库入门:import 用法 + 常用库

Python库入门，记住这两点就够了：

  • import用法：import 库名 或 from 库名 import 工具，想偷懒就 import 库名 as 别名。

  • 常用库：NumPy（数学计算）、Pandas（数据处理）、Matplotlib（画图）、Requests（抓网页）、BeautifulSoup（解析HTML）。

先学会 import，剩下的边用边查，别死记！

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  2. 运行时间 : 0.122944s [ 吞吐率：8.13req/s ] 内存消耗：4,455.66kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=bd183859ce06ecfb8db9131a04a40d28
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  1. CONNECT:[ UseTime:0.000656s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007787s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000642s ]
  6. SELECT * FROM `set` [ RunTime:0.000209s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 495764 LIMIT 1 [ RunTime:0.000432s ]
  9. UPDATE `article` SET `lasttime` = 1783027486 WHERE `id` = 495764 [ RunTime:0.001963s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000331s ]
  11. SELECT * FROM `article` WHERE `id` < 495764 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000863s ]
  12. SELECT * FROM `article` WHERE `id` > 495764 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010766s ]
  13. SELECT * FROM `article` WHERE `id` < 495764 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017833s ]
  14. SELECT * FROM `article` WHERE `id` < 495764 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001990s ]
  15. SELECT * FROM `article` WHERE `id` < 495764 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010286s ]
0.124553s