山云的专栏

荷兰程序员Guido van Rossum在1989年受ABC语言启发，结合C语言功能与shell易用性，创造了Python语言。他借鉴美国诗人赖利的"鸭子测试"概念，提出"鸭子类型"编程思想：只要对象具有相同行为，就视为同类型。但随着Python项目规模扩大，动态类型导致插件兼容性问题。2007年Python引入abc模块，通过抽象基类提供接口约束，弥补鸭子类型的不足。文章通过相机控制模块案例，对比了纯鸭子类型与抽象类写法的优缺点，展示了Python类型系统的演进过

 .1 java 入门的经典书是那些.2 怎样开始学习java.3 java的开发工具是哪些? (what is the best fundamental books for java easy leaner? how to study the java ? and how and whatthe java tools would be in used should be the major ma

Introduction to Objects:The Progress of abstraction:.1 All of the programming language privide abstraction.Since all kinds of imperativelanguage is base on the assembly language , and, the assembly la

This is a backup of my reading notes: From:http://blog.4kiki.net/hsy75/article/1306/==============================================================================================================[8-21]