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第18课：面向对象编程进阶.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC18%E8%AF%BE%EF%BC%9A%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1%E7%BC%96%E7%A8%8B%E8%BF%9B%E9%98%B6.md
第19课：面向对象编程应用.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC19%E8%AF%BE%EF%BC%9A%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1%E7%BC%96%E7%A8%8B%E5%BA%94%E7%94%A8.md
第19课：面向对象编程应用.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC19%E8%AF%BE%EF%BC%9A%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1%E7%BC%96%E7%A8%8B%E5%BA%94%E7%94%A8.md
第20课：Python标准库初探.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC20%E8%AF%BE%EF%BC%9APython%E6%A0%87%E5%87%86%E5%BA%93%E5%88%9D%E6%8E%A2.md
第20课：Python标准库初探.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC20%E8%AF%BE%EF%BC%9APython%E6%A0%87%E5%87%86%E5%BA%93%E5%88%9D%E6%8E%A2.md
第21课：文件读写和异常处理.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC21%E8%AF%BE%EF%BC%9A%E6%96%87%E4%BB%B6%E8%AF%BB%E5%86%99%E5%92%8C%E5%BC%82%E5%B8%B8%E5%A4%84%E7%90%86.md
第21课：文件读写和异常处理.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC21%E8%AF%BE%EF%BC%9A%E6%96%87%E4%BB%B6%E8%AF%BB%E5%86%99%E5%92%8C%E5%BC%82%E5%B8%B8%E5%A4%84%E7%90%86.md
第22课：对象的序列化和反序列化.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC22%E8%AF%BE%EF%BC%9A%E5%AF%B9%E8%B1%A1%E7%9A%84%E5%BA%8F%E5%88%97%E5%8C%96%E5%92%8C%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96.md
第22课：对象的序列化和反序列化.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC22%E8%AF%BE%EF%BC%9A%E5%AF%B9%E8%B1%A1%E7%9A%84%E5%BA%8F%E5%88%97%E5%8C%96%E5%92%8C%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96.md
第23课：用Python读写CSV文件.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC23%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%AF%BB%E5%86%99CSV%E6%96%87%E4%BB%B6.md
第23课：用Python读写CSV文件.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC23%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%AF%BB%E5%86%99CSV%E6%96%87%E4%BB%B6.md
第24课：用Python读写Excel文件-1.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC24%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%AF%BB%E5%86%99Excel%E6%96%87%E4%BB%B6-1.md
第24课：用Python读写Excel文件-1.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC24%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%AF%BB%E5%86%99Excel%E6%96%87%E4%BB%B6-1.md
第25课：用Python读写Excel文件-2.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC25%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%AF%BB%E5%86%99Excel%E6%96%87%E4%BB%B6-2.md
第25课：用Python读写Excel文件-2.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC25%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%AF%BB%E5%86%99Excel%E6%96%87%E4%BB%B6-2.md
第26课：用Python操作Word文件和PowerPoint.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC26%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E6%93%8D%E4%BD%9CWord%E6%96%87%E4%BB%B6%E5%92%8CPowerPoint.md
第26课：用Python操作Word文件和PowerPoint.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC26%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E6%93%8D%E4%BD%9CWord%E6%96%87%E4%BB%B6%E5%92%8CPowerPoint.md
第27课：用Python操作PDF文件.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC27%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E6%93%8D%E4%BD%9CPDF%E6%96%87%E4%BB%B6.md
第27课：用Python操作PDF文件.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC27%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E6%93%8D%E4%BD%9CPDF%E6%96%87%E4%BB%B6.md
第28课：用Python处理图像.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC28%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E5%A4%84%E7%90%86%E5%9B%BE%E5%83%8F.md
第28课：用Python处理图像.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC28%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E5%A4%84%E7%90%86%E5%9B%BE%E5%83%8F.md
第29课：用Python发送邮件和短信.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC29%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6%E5%92%8C%E7%9F%AD%E4%BF%A1.md
第29课：用Python发送邮件和短信.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC29%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E5%8F%91%E9%80%81%E9%82%AE%E4%BB%B6%E5%92%8C%E7%9F%AD%E4%BF%A1.md
第30课：正则表达式的应用.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC30%E8%AF%BE%EF%BC%9A%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E7%9A%84%E5%BA%94%E7%94%A8.md
第30课：正则表达式的应用.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC30%E8%AF%BE%EF%BC%9A%E6%AD%A3%E5%88%99%E8%A1%A8%E8%BE%BE%E5%BC%8F%E7%9A%84%E5%BA%94%E7%94%A8.md
第31课：网络数据采集概述.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC31%E8%AF%BE%EF%BC%9A%E7%BD%91%E7%BB%9C%E6%95%B0%E6%8D%AE%E9%87%87%E9%9B%86%E6%A6%82%E8%BF%B0.md
第31课：网络数据采集概述.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC31%E8%AF%BE%EF%BC%9A%E7%BD%91%E7%BB%9C%E6%95%B0%E6%8D%AE%E9%87%87%E9%9B%86%E6%A6%82%E8%BF%B0.md
第32课：用Python获取网络资源.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC32%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%8E%B7%E5%8F%96%E7%BD%91%E7%BB%9C%E8%B5%84%E6%BA%90.md
第32课：用Python获取网络资源.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC32%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%8E%B7%E5%8F%96%E7%BD%91%E7%BB%9C%E8%B5%84%E6%BA%90.md
第33课：用Python解析HTML页面.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC33%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%A7%A3%E6%9E%90HTML%E9%A1%B5%E9%9D%A2.md
第33课：用Python解析HTML页面.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC33%E8%AF%BE%EF%BC%9A%E7%94%A8Python%E8%A7%A3%E6%9E%90HTML%E9%A1%B5%E9%9D%A2.md
第34课：Python中的并发编程-1.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC34%E8%AF%BE%EF%BC%9APython%E4%B8%AD%E7%9A%84%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B-1.md
第34课：Python中的并发编程-1.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC34%E8%AF%BE%EF%BC%9APython%E4%B8%AD%E7%9A%84%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B-1.md
第35课：Python中的并发编程-2.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC35%E8%AF%BE%EF%BC%9APython%E4%B8%AD%E7%9A%84%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B-2.md
第35课：Python中的并发编程-2.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC35%E8%AF%BE%EF%BC%9APython%E4%B8%AD%E7%9A%84%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B-2.md
第36课：Python中的并发编程-3.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC36%E8%AF%BE%EF%BC%9APython%E4%B8%AD%E7%9A%84%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B-3.md
第36课：Python中的并发编程-3.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC36%E8%AF%BE%EF%BC%9APython%E4%B8%AD%E7%9A%84%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B-3.md
第37课：并发编程在爬虫中的应用.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC37%E8%AF%BE%EF%BC%9A%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B%E5%9C%A8%E7%88%AC%E8%99%AB%E4%B8%AD%E7%9A%84%E5%BA%94%E7%94%A8.md
第37课：并发编程在爬虫中的应用.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC37%E8%AF%BE%EF%BC%9A%E5%B9%B6%E5%8F%91%E7%BC%96%E7%A8%8B%E5%9C%A8%E7%88%AC%E8%99%AB%E4%B8%AD%E7%9A%84%E5%BA%94%E7%94%A8.md
第38课：抓取网页动态内容.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC38%E8%AF%BE%EF%BC%9A%E6%8A%93%E5%8F%96%E7%BD%91%E9%A1%B5%E5%8A%A8%E6%80%81%E5%86%85%E5%AE%B9.md
第38课：抓取网页动态内容.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC38%E8%AF%BE%EF%BC%9A%E6%8A%93%E5%8F%96%E7%BD%91%E9%A1%B5%E5%8A%A8%E6%80%81%E5%86%85%E5%AE%B9.md
第39课：爬虫框架Scrapy简介.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC39%E8%AF%BE%EF%BC%9A%E7%88%AC%E8%99%AB%E6%A1%86%E6%9E%B6Scrapy%E7%AE%80%E4%BB%8B.md
第39课：爬虫框架Scrapy简介.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC39%E8%AF%BE%EF%BC%9A%E7%88%AC%E8%99%AB%E6%A1%86%E6%9E%B6Scrapy%E7%AE%80%E4%BB%8B.md
第40课：关系型数据库和MySQL概述.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC40%E8%AF%BE%EF%BC%9A%E5%85%B3%E7%B3%BB%E5%9E%8B%E6%95%B0%E6%8D%AE%E5%BA%93%E5%92%8CMySQL%E6%A6%82%E8%BF%B0.md
第40课：关系型数据库和MySQL概述.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC40%E8%AF%BE%EF%BC%9A%E5%85%B3%E7%B3%BB%E5%9E%8B%E6%95%B0%E6%8D%AE%E5%BA%93%E5%92%8CMySQL%E6%A6%82%E8%BF%B0.md
第41课.SQL详解之DDL.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC41%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDDL.md
第41课.SQL详解之DDL.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC41%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDDL.md
第42课.SQL详解之DML.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC42%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDML.md
第42课.SQL详解之DML.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC42%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDML.md
第43课.SQL详解之DQL.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC43%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDQL.md
第43课.SQL详解之DQL.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC43%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDQL.md
第44课.SQL详解之DCL.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC44%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDCL.md
第44课.SQL详解之DCL.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC44%E8%AF%BE.SQL%E8%AF%A6%E8%A7%A3%E4%B9%8BDCL.md
第45课.索引.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC45%E8%AF%BE.%E7%B4%A2%E5%BC%95.md
第45课.索引.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC45%E8%AF%BE.%E7%B4%A2%E5%BC%95.md
第46课.视图+函数+过程.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC46%E8%AF%BE.%E8%A7%86%E5%9B%BE%2B%E5%87%BD%E6%95%B0%2B%E8%BF%87%E7%A8%8B.md
第46课.视图+函数+过程.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC46%E8%AF%BE.%E8%A7%86%E5%9B%BE%2B%E5%87%BD%E6%95%B0%2B%E8%BF%87%E7%A8%8B.md
第47课.MySQL新特性.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC47%E8%AF%BE.MySQL%E6%96%B0%E7%89%B9%E6%80%A7.md
第47课.MySQL新特性.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC47%E8%AF%BE.MySQL%E6%96%B0%E7%89%B9%E6%80%A7.md
第48课.Python程序接入MySQL数据库.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC48%E8%AF%BE.Python%E7%A8%8B%E5%BA%8F%E6%8E%A5%E5%85%A5MySQL%E6%95%B0%E6%8D%AE%E5%BA%93.md
第48课.Python程序接入MySQL数据库.md	https://github.com/feodorren/Python-Core-50-Courses/blob/master/%E7%AC%AC48%E8%AF%BE.Python%E7%A8%8B%E5%BA%8F%E6%8E%A5%E5%85%A5MySQL%E6%95%B0%E6%8D%AE%E5%BA%93.md
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