Scala List FAQ: How do I add elements to a Scala List? This is actually a trick question, because you can't add elements to a ScalaList; it's an immutable data structure, like a Java String. Prepending elements to Scala Lists One thing you can do whe…
Scala List FAQ: How do I add elements to a Scala List? This is actually a trick question, because you can't add elements to a ScalaList; it's an immutable data structure, like a Java String. Prepending elements to Scala Lists One thing you can do whe…
基本数据类型补充: set 是一个无序且不重复的元素集合 class set(object): """ set() -> new empty set object set(iterable) -> new set object Build an unordered collection of unique elements. """ def add(self, *args, **kwargs): # real signature un…
/int整数/ 如: 18.73.84 每一个整数都具备如下功能: class int(object): """ int(x=0) -> int or long int(x, base=10) -> int or long Convert a number or string to an integer, or return 0 if no arguments are given. If x is floating point, the conversion tr…
Scala's object-oriented collections support mutable and immutable type hierarchies. Also support functional higher-order operations such as map, filter, and reduce that let you use expression-oriented programming in collections. Higher-order operatio…
1. Variables (1) Three ways to define variables: 1) val refers to define an immutable variable; scala> val x = x: Int = scala> x*x res4: Int = scala> res4 + # use result as a value res6: Int = scala> res4 + res6 res7: Int = scala> x = # x i…
Design and implement a data structure for Least Frequently Used (LFU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1. s…
写在粘贴复制前:英文的感觉也可以,也能看的懂,多看看英文资料没坏处的 Problem. You have questions about the List collection in the .NET Framework, which is located in the System.Collections.Generic namespace. You want to see examples of using List and also explore some of the many use…
java.util.concurrent 类 LinkedBlockingQueue<E> java.lang.Object java.util.AbstractCollection<E> java.util.AbstractQueue<E> java.util.concurrent.LinkedBlockingQueue<E> 类型参数: E - the type of elements held in this collection 所有已实现的接口:…
一.作用域 对于变量的作用域,执行声明并在内存中存在,该变量就可以在下面的代码中使用. if 1==1: name = 'wupeiqi' print name 二.三元运算 result = 值1 if 条件 else 值2 如#果条件成立,值1付给result否则值2付给result 如果条件为真:result = 值1如果条件为假:result = 值2 name = 'sb' if 1==1 else '2b' input = raw_input() result = '2b'…
<script> //helper function to create the formfunction getNewSubmitForm(){ var submitForm = document.createElement("FORM"); document.body.appendChild(submitForm); submitForm.method = "POST"; return submitForm;} //helper function t…
分析sizzle源码并不是为了去钻牛角尖,而是去了解它的思想,学习下期中一些技术的运用. 1,sizzle中的正则表达式jquery源码中充斥着各种正则表达式,能否看懂其源码的关键之一就是对正则表达式的理解.RegExp对象的exec方法:返回一个数组,第一个是匹配项,后边依次是分组匹配项,如果分组匹配不成功,则为undefined.而且还返回属性index(匹配项起始index),input(要验证的字符串)比如: var r=/^(\d{1})\s((\w?)|(\d{1}))$/.exec…
1 collections系列 方法如下 class Counter(dict): '''Dict subclass for counting hashable items. Sometimes called a bag or multiset. Elements are stored as dictionary keys and their counts are stored as dictionary values. >>> c = Counter('abcdeabcdabcaba'…
参考链接:老师 BLOG : http://www.cnblogs.com/wupeiqi/articles/4906230.html 入门拾遗 一.作用域 只要变量在内存中就能被调用!但是(函数的栈有点区别) 对于变量的作用域,执行声明并在内存中存在,如果变量在内存中存在就可以被调用. if 1==1: name = 'tianshuai' print name 所以下面的说法是不对的: 外层变量,可以被内层变量使用 内层变量,无法被外层变量使用 二.三元运算 result = 值1 if 条…
TSTack User Guid 翻译过来的 1.简介 2.BTStack 架构 BTStack在所实现的协议和服务之间采用很多状态机实现相互作用,特点: <1>单线程.BTStack只有一个单独的循环. <2>没有阻塞,采用event事件方式. <3>No artficially limited buffers/pools-Incoming and out going data packets are not queued <4>Statically bo…
collections collections是Python数据类型的补充,可以实现Counter计数.可命名元组(namedtuple).默认字典.有序字典.双向队列等功能 参考:http://python.usyiyi.cn/python_278/library/collections.html Help on module collections: NAME collections FILE c:\python27\lib\collections.py CLASSES __builtin_…
