#Android
Android startActivityForResult的基本用法详解
知识准备： 1、startActivityForResult(Intent intent, int requestCode)：启动 Activity，同时等待该 Activity …
#Python
(手写)PCA原理及其Python实现图文详解
目录1、背景2、样本均值和样本方差矩阵3、PCA3.1 最大投影方差3.2 最小重构距离4、Python实现总结1、背景 为什么需要降维呢？ 因为数据个数 N 和每个数据的维度 p…
#Python
一篇文章告诉你如何用Python控制Excel实现自动化办公
目录1.安装2.操作一个简单的Excel文档3.操作简单Excel文档并添加数据格式4.Excel中添加不同类型的数据5.Excel中添加数据图表最后：可能给予你助力的教程总结1.…
#Android
Android AlertDialog的几种用法详解
AlertDialog的几种用法 xml代码： <?xml version=\"1.0\" encoding=\"utf-8\"?> <Lin…
#Python
python数据库操作–数据库使用概述
目录1. 数据库基础知识2. 访问数据库基本原理1.应用系统2.数据库驱动程序 3.数据库系统3. ODBC与ADO1.** ODBC**2.ADO4. 关系型数据库总…
#Python
如何用Python画一些简单形状你知道吗
目录进入主题总结进入主题 1. import turtle as t import math t.pensize(3) t.tracer(10) t.hideturtle() st…
#Python
一分钟带你掌握Python中pip的安装与使用方法
目录一、简单介绍二、下载安装三、最常用命令1、显示版本和路径2、获取帮助3、升级 pip4、安装包5、升级包6、卸载包7、搜索包8、显示安装包信息9、列出已安装的包10、查看指定包…
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