Week 1 OverviewHelp Center Week 1 On this page: Instructional Activities Time Goals and Objectives Key Phrases/Concepts Guiding Questions Readings and Resources Video Lectures Tips for Success Getting and Giving Help Instructional Activities Below is…

Week 2 OverviewHelp Center Week 2 On this page: Instructional Activities Time Goals and Objectives Key Phrases/Concepts Guiding Questions Readings and Resources Video Lectures Tips for Success Getting and Giving Help Instructional Activities Below is…

Week 3 OverviewHelp Center Week 3 On this page: Instructional Activities Time Goals and Objectives Key Phrases/Concepts Guiding Questions Readings and Resources Video Lectures Tips for Success Getting and Giving Help Instructional Activities Below is…

Week 4 OverviewHelp Center Week 4 On this page: Instructional Activities Time Goals and Objectives Key Phrases/Concepts Guiding Questions Readings and Resources Video Lectures Tips for Success Getting and Giving Help Instructional Activities Below is…

Coursera课程<Using Databases with Python> 密歇根大学 Week4 Many-to-Many Relationships in SQL 15.8 Many-to-Many Relationships 我们之前学的都是One-to-Many的关系,比如说Album与Track的关系.而我们现在要说的是Many-to-Many关系,比如说Books与Authors的关系. 所以我们需要在Books表和Authors的表中间建立一个新表来将它转变成One-to-M…

Coursera课程<Using Python to Access Web Data> 密歇根大学 Week6 JSON and the REST Architecture 13.5 JavaScript Object Notation(JSON) JSON是一种相比于XML更简单的格式,而且现在在互联网上非常普遍.XML是很强大,但是很多时候我们并不需要使用这么强大的格式,我们就能完成我们的任务. import json data = '''{ "name": "…

Coursera课程<Using Python to Access Web Data > 密歇根大学 Charles Severance Week2 Regular Expressions 11.1 Regular Expressions 11.1.1 Python Regular Expression Quick Guide ^ 匹配一行的开头 $ 匹配一行的末尾 . 匹配任何字符 \s 匹配空白字符 \S 匹配任何非空白字符 ***** 重复一个字符0次或多次 *? 重复一个字符0次或多次…

上周三收到Coursera平台的群发邮件,大意是Coursera将在6月30号彻底关闭旧的课程平台,全面升级到新的课程平台上,一些旧的课程资源(课程视频.课程资料)将不再保存,如果你之前学习过相关的课程,或者有心仪的课程,Coursera建议你将这些课程资源下载下来备份. 说实话,自从Coursera这一两年逐渐进行“商业升级”以后,我已经很少在这个平台上学习公开课了,反而是edX的一些课程更吸引我,特别是课程质量,后者显得更用心很多.不过作为最早的MOOC平台Coursera,曾经诞生了很多经…

Coursera课程<面向 Web 开发者的 HTML.CSS 与 Javascript> Johns Hopkins University Yaakov Chaikin Week1 Introduction to HTML5 对于网页来说,HTML定义的是网页的骨架(structure),CSS定义的是网页的风格(style),JavaScript定义的是网页的动作(Behavior). 使用http://validator.w3.org可以来验证你写的HTML是否符合标准. HTML标签的…

Coursera课程<Neural Networks and Deep Learning> deeplearning.ai Week2 Neural Networks Basics 2.1 Logistic Regression as a Neutral Network 2.1.1 Binary Classification 二分类 逻辑回归是一个用于二分类(binary classification)的算法.首先我们从一个问题开始说起,这里有一个二分类问题的例子,假如你有一张图片作为输入,比…