<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[haixingd的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/haixingd</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; haixingd]]></copyright><item><title><![CDATA[查找列表中的重复、单一的数]]></title><link>https://blog.youkuaiyun.com/haixingd/article/details/107580969</link><guid>https://blog.youkuaiyun.com/haixingd/article/details/107580969</guid><author>haixingd</author><pubDate>Sat, 25 Jul 2020 19:20:27 +0800</pubDate><description><![CDATA[如何查找列表中的重复的数
**思路**：遍历列表中的数据，并依次把遍历出的值存入一个新的集合，如果后取出的数存在于新的集合中，那么判定这个值是重复的

代码：
class FindNum:
    def repeat(self, nums):
        if nums is None or len(nums) &lt;= 1:
            return False
        all_set = set()
        repetition_set = set()
       ]]></description><category></category></item><item><title><![CDATA[Python用正则爬取图片]]></title><link>https://blog.youkuaiyun.com/haixingd/article/details/100558277</link><guid>https://blog.youkuaiyun.com/haixingd/article/details/100558277</guid><author>haixingd</author><pubDate>Thu, 05 Sep 2019 16:40:31 +0800</pubDate><description><![CDATA[爬取的目标网站为：http://www.1ppt.com/beijing/ppt_beijing_1.html
爬取流程分析


]]></description><category></category></item><item><title><![CDATA[MySql去重]]></title><link>https://blog.youkuaiyun.com/haixingd/article/details/96474436</link><guid>https://blog.youkuaiyun.com/haixingd/article/details/96474436</guid><author>haixingd</author><pubDate>Fri, 19 Jul 2019 10:46:54 +0800</pubDate><description><![CDATA[MySql去重需求：去重添加主键
需求：去重
在数据库中存在重复的多条数据，需要删除多余的数据，只保留其中一条
添加主键
如果在原始数据没有自动增长的主键，则添加一个主键 id：
1.设定一个变量并赋值
set @a:=0;
update xiciip set id=(@a:=@a:+1);  #xiciip 为表名



...]]></description><category></category></item></channel></rss>