<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[Michelle8023的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/Michelle8023</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; Michelle8023]]></copyright><item><title><![CDATA[25网络 python模拟测试]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/170138830</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/170138830</guid><author>Michelle8023</author><pubDate>Thu, 05 Nov 2026 14:12:17 +0800</pubDate><description><![CDATA[else: print(“60元”))20、已知 L = [3, 1, 4, 1, 5]，执行 L.sort（reverse=True） 后，L的值为（ ） [单选题] *23、现有元组 t = （1, 2, 3, 4），执行 t2 = t * 2 后，len（t2） 的结果是（ ） [单选题] *11、已知 s = “Python”，执行 print（s[::-1]） 的结果是（ ） [单选题] *19、已知 L = [3, 1, 4, 1, 5]，L.count（1） 的结果是（ ） [单选题] *]]></description><category></category></item><item><title><![CDATA[Python——字符串与格式化输出]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/170040921</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/170040921</guid><author>Michelle8023</author><pubDate>Wed, 04 Nov 2026 13:11:47 +0800</pubDate><description><![CDATA[说明：重点标记二级考试考点、易错坑点，代码可以直接在IDLE运行。前置知识：已经掌握4种基础数据类型、类型转换、算术运算符、input()输入。]]></description><category></category></item><item><title><![CDATA[Python线性回归实操实验任务]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/169749495</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/169749495</guid><author>Michelle8023</author><pubDate>Mon, 02 Nov 2026 01:17:06 +0800</pubDate><description><![CDATA[python线性回归实操
]]></description><category></category></item><item><title><![CDATA[第1周摸底测试]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/169266108</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/169266108</guid><author>Michelle8023</author><pubDate>Tue, 27 Oct 2026 18:48:28 +0800</pubDate><description><![CDATA[第1—10题为公共基础知识（你之前可能没学过，凭感觉选即可）；第11—40题为Python语法题。]]></description><category></category></item><item><title><![CDATA[第1周——认清考试与IDLE生存指南]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/169266068</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/169266068</guid><author>Michelle8023</author><pubDate>Tue, 27 Oct 2026 18:36:18 +0800</pubDate><description><![CDATA[大家之前都已经学过一轮Python了，写九九乘法表、做数字反转都不在话下。但是，。从今天开始，我们要把以前学的知识，全部转化为考试的分数！]]></description><category></category></item><item><title><![CDATA[随机森林：让一群“小专家”帮你做决定]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/169170958</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/169170958</guid><author>Michelle8023</author><pubDate>Mon, 26 Oct 2026 23:37:47 +0800</pubDate><description><![CDATA[上节课我们做了好几道决策树习题，比如还有——这些规则清晰、好懂，画出来一目了然。好比奶茶店老板把的偏好都记成规则：“穿红衣服的小王来了就推荐果茶”“戴眼镜的小李来了就推荐热奶茶”……规则越记越多、越记越细，结果来了一个，老板反而不知道推荐什么了——因为他记的都是“个例”，不是“规律”。决策树也一样：树长得越深，越会揪住训练数据里的不放，遇到新数据反而判不准。🧩：一棵决策树就像一个——老顾客的喜好他记得滴水不漏，但新顾客一进门，他就“这人我没见过”，反而不会推荐了。]]></description><category></category></item><item><title><![CDATA[ID3决策树实验报告]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/169138634</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/169138634</guid><author>Michelle8023</author><pubDate>Mon, 26 Oct 2026 09:31:58 +0800</pubDate><description><![CDATA[任务：在原有递归建树逻辑基础上，新增两个停止条件：最大深度、节点最小样本数，实现预剪枝，抑制过拟合。过拟合：决策树不断分裂，直到所有叶子节点类别纯、或者特征耗尽，会学习到训练集噪声，泛化能力变差。理解原生ID3决策树存在的问题：无剪枝、容易过拟合、仅能生成树结构，不能对新样本预测。任务：搭建基础模块，实现信息熵计算、数据集划分、多数类统计，是ID3的底层依赖。任务：调用上面函数，训练带剪枝的决策树，打印树，输入测试样本查看分类结果。复习ID3决策树原理：信息熵、信息增益、特征选择、数据集划分。]]></description><category></category></item><item><title><![CDATA[8-3 for循环练习]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/168866817</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/168866817</guid><author>Michelle8023</author><pubDate>Fri, 23 Oct 2026 12:02:29 +0800</pubDate><description><![CDATA[【代码】8-3 for循环练习。]]></description><category></category></item><item><title><![CDATA[8-2 for循环]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/168854832</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/168854832</guid><author>Michelle8023</author><pubDate>Fri, 23 Oct 2026 10:12:56 +0800</pubDate><description><![CDATA[【代码】8-2 for循环。]]></description><category></category></item><item><title><![CDATA[8-1 嵌套if]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/168765820</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/168765820</guid><author>Michelle8023</author><pubDate>Thu, 22 Oct 2026 15:03:51 +0800</pubDate><description><![CDATA[【代码】8-1 嵌套if。]]></description><category></category></item><item><title><![CDATA[7-3 if多分支语句]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/168127235</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/168127235</guid><author>Michelle8023</author><pubDate>Fri, 16 Oct 2026 12:03:00 +0800</pubDate><description><![CDATA[【代码】7-3 if多分支语句。]]></description><category></category></item><item><title><![CDATA[7-2 字典]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/168113848</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/168113848</guid><author>Michelle8023</author><pubDate>Fri, 16 Oct 2026 10:13:29 +0800</pubDate><description><![CDATA[【代码】7-2 字典。]]></description><category></category></item><item><title><![CDATA[7-1 列表和元组]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/168022633</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/168022633</guid><author>Michelle8023</author><pubDate>Thu, 15 Oct 2026 15:03:12 +0800</pubDate><description><![CDATA[【代码】7-1 列表和元组。]]></description><category></category></item><item><title><![CDATA[6-2 列表]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/167378668</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/167378668</guid><author>Michelle8023</author><pubDate>Fri, 09 Oct 2026 12:02:43 +0800</pubDate><description><![CDATA[【代码】6-2 列表。]]></description><category></category></item><item><title><![CDATA[6-1 字符串格式化]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/167275059</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/167275059</guid><author>Michelle8023</author><pubDate>Thu, 08 Oct 2026 15:03:52 +0800</pubDate><description><![CDATA[print(“姓名: %s，年龄：%d，价格：%.4f” % (name,age,price))print(“价格：%.2f” % price) #输出精度为2。print(“价格：%f” % price) #默认精度为6。将字符串中所有大写转换为小写，所有小写转换为大写。将字符串的第一个字符转换为大写，其他字符为小写。name=“alice” #字符串类型 %s。print(“姓名：%s” % name)print(“年龄：%d” % age)将字符串所有大写字符转换为小写。age=25 #整数 %d。]]></description><category></category></item><item><title><![CDATA[4-1 字符串切片]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/166591264</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/166591264</guid><author>Michelle8023</author><pubDate>Thu, 24 Sep 2026 14:21:21 +0800</pubDate><description><![CDATA[【代码】4-1 字符串切片。]]></description><category></category></item><item><title><![CDATA[3-2变量赋值]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/165849556</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/165849556</guid><author>Michelle8023</author><pubDate>Fri, 18 Sep 2026 10:18:29 +0800</pubDate><description><![CDATA[【代码】3-2变量赋值。]]></description><category></category></item><item><title><![CDATA[25网络 python代码合集]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/165746682</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/165746682</guid><author>Michelle8023</author><pubDate>Thu, 17 Sep 2026 15:15:08 +0800</pubDate><description><![CDATA[3-1 标识符]]></description><category></category></item><item><title><![CDATA[3-1标识符]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/165746044</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/165746044</guid><author>Michelle8023</author><pubDate>Thu, 17 Sep 2026 15:04:19 +0800</pubDate><description><![CDATA[【代码】3-1标识符。]]></description><category></category></item><item><title><![CDATA[25大数据 16-1 期末复习1]]></title><link>https://blog.youkuaiyun.com/Michelle8023/article/details/162061810</link><guid>https://blog.youkuaiyun.com/Michelle8023/article/details/162061810</guid><author>Michelle8023</author><pubDate>Wed, 17 Jun 2026 11:30:54 +0800</pubDate><description><![CDATA[【代码】25大数据 16-1 期末复习1。]]></description><category></category></item></channel></rss>