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python:numpy基础数组操作和基本运算

  • 2026-02-01 19:29:32
python:numpy基础数组操作和基本运算

numpy基础数组操作和基本运算

1.认识数组

介绍三种创建数组的方式

2.数组操作

数组的索引和切片

索引非常的重要,后面我们细聊series会详细介绍,这里先行了解

3.数组变形

我们在处理数据的时候，常常涉及到一维表转二维,二维转回一维的场景

4.数组的基本运算

日常的四则运算，统计计算逻辑比较简单，结合案例可以很快理解

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  12. SELECT * FROM `article` WHERE `id` > 466453 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007022s ]
  13. SELECT * FROM `article` WHERE `id` < 466453 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.061153s ]
  14. SELECT * FROM `article` WHERE `id` < 466453 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.056682s ]
  15. SELECT * FROM `article` WHERE `id` < 466453 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018307s ]
0.296824s