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[Python] Check for None (Null) in Python
If you’ve used other programming languages, you may have learned that an empty object is not the same as an object that does not exist. In this lesson ...
分类:编程语言   时间:2017-12-09 19:42:42    阅读次数:248
[Python] Understand Mutable vs. Immutable objects in Python
In this lesson, you will learn what mutable and immutable objects are, and the difference between them. This understanding will help you determine whe ...
分类:编程语言   时间:2017-12-09 19:32:54    阅读次数:134
[Python] Manage Dependencies with Python Virtual Environments
Virtual Environments ensure that dependencies from one Python application don’t overwrite the dependencies of another application. In this lesson, you ...
分类:编程语言   时间:2017-12-09 19:19:39    阅读次数:174
[React] Controlling Form Values with React
In this lesson we'll talk about controlling the value for inputs, textareas, and select elements. We'll see how to manage the state ourselves while st ...
分类:其他好文   时间:2017-12-08 23:06:22    阅读次数:161
Lesson 3 上机练习题——继承
– 在包bzu.aa中定义一个交通工具类(Vehicle): n 属性——载客量(capacity) n 方法 u 无参构造方法(给capacity初始化值为2,并输出“执行交通工具类的无参构造方法。”) u 有参构造方法(传参给capacity初始化,并输出“执行交通工具的有参构造方法。”) u ...
分类:其他好文   时间:2017-12-08 00:02:32    阅读次数:190
react-native-lesson
一、React-Native入门指南 lesson1: Hello React-Native lesson2: 认识代码结构 lesson3: css和布局 lesson4: 学会React-Native布局(一) lesson5: 学会React-Native布局(二) lesson6: UI组件 ...
分类:其他好文   时间:2017-12-02 11:30:37    阅读次数:127
[Javascript] Compose multiple functions for new behavior in JavaScript
In this lesson you will create a utility function that allows you to quickly compose behavior of multiple functions to create new behavior. By the end ...
分类:编程语言   时间:2017-11-30 19:19:20    阅读次数:140
codeforce895B
While Vasya finished eating his piece of pizza, the lesson has already started. For being late for the lesson, the teacher suggested Vasya to solve on ...
分类:其他好文   时间:2017-11-29 22:01:21    阅读次数:201
Java学习lesson 15
*Set集合一个包含重复的元素collection,并且最多包含一个null元素,此类实现Set接口,有哈希表支持,Java中的预定义类型如String、Integer都可以在集合内使用;但对于自己创建的类型是,要注意到Set需要一种方式来维护存储顺序,而存储顺序如何维护,则是在Set的不同实现间会..
分类:编程语言   时间:2017-11-16 20:54:52    阅读次数:217
Java学习lesson 14
*数据结构*栈结构(先进后出,后进先出)特点:进栈的方式叫压栈出栈的方式叫弹栈*队列(先进先出)*数组(查询快,增删慢)*链表结构有很多链子将多个节点连接起来每一个节点(数据):数据域(值)和指针域对于列表来说都是从第一个元素对应的指针域依次进行查询(从头开始找..
分类:编程语言   时间:2017-11-16 18:37:01    阅读次数:203
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