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原创 python set的应用

You are given two sorted arrays that contain only integers. Your task is to find a way to merge them into a single one, sorted inascending order. Complete the function mergeArrays(arr1, arr2), where ...

2018-07-24 10:13:41 700

原创 python 类的初识

Python作为高级语言,也是一门面向对象的语言。面向对象实现的基础就是类(Class)。今天来看一下python中类是如何创建的。如果有接触过面向对象,例如Java,那么对以下概念的理解应该不是很难。关于类的简介类(Class): 用来描述具有相同的属性和方法的对象的集合。它定义了该集合中每个对象所共有的属性和方法。它是一种抽象的概念。 类变量:类变量在整个实例化的对象中是公用的...

2018-07-19 14:20:39 291

原创 python hello world

学习大多数的编程语言时,基本上都绕不开 hello world那么python的hello world呢,刚刚在codewars上看到了几个。切片def greet(): return 'dlrow olleh'[::-1]def greet(): return 'The most beautiful hello world'[19:] 编码greet...

2018-07-17 18:10:09 1110

原创 python 格式化字符串 str.format()

Task:Given a number, 3 for example, return a string with a murmur: "1 sheep...2 sheep...3 sheep..."Note:You will always receive a positive integer.可以直接用for和字符串拼接 ,不过需要先将range(1,n+1)字符串化,否则st...

2018-07-17 15:14:37 576

原创 Python 字符替换

 python中对字符串中的字符进行替换,首先想到的是str.replace()这对单个及少量字符的替换是比较方便的。例如,将所有的‘5’,‘0’,‘1’全部替换为‘S’,'O','I':>>> x= "W0W! 1'm 5o good!">>> x.replace('0','O').replace('1','I').replace('5...

2018-07-17 11:36:05 2060 2

原创 python 数字判断

Given a string s, write a method (function) that will return true if its a valid single integer or floating number or false if its not.Valid examples, should return true:isDigit("3")isDigit(" 3...

2018-07-16 23:16:49 4845

原创 Python join()

一下是*/Python27/Lib/string.py中关于join的定义 join() 方法用于将序列中的元素以指定的字符连接生成一个新的字符串。def join(words, sep = ' '): #默认seq为一个空格 """join(list [,sep]) -> string #返回值为string Return a string composed of the...

2018-07-15 23:16:00 2357

原创 re 高级字符串处理工具

Description:    Replace all vowel to exclamation mark in the sentence. aeiouAEIOU is vowel.Examples    replace("Hi!") === "H!!"    replace("!Hi! Hi!") === "!H!! H!!"    replace("aeiou") === "!!!!!&quot

2018-07-15 19:04:44 365 1

原创 vim 异常退出 swp文件提示

    刚开始使用vim编辑文档时,由于对模式及命令的不熟悉,经常会进入一些搞不清状况的情形,然后强制退出文档,最开始的时候甚至会使用Ctrl+Z来强制关闭vim。    诸如此类的非正常关闭vim编辑器(直接关闭终端、电脑断电等),都会生成一个用于备份缓冲区内容的临时文件——.swp文件。它记录了用户在非正常关闭vim编辑器之前未能及时保存的修改,用于文件恢复。并且多次意外退出并不会覆盖旧的.s...

2018-07-04 16:37:37 9687 45

原创 命令 date

 date命令可以用来显示或设定系统的日期与时间,在显示方面,使用者可以设定欲显示的格式,格式设定为一个加号后接数个标记1. 显示时间| date --date=11:11:11date命令的参数有很多,这里就不一一列举了。看上去,自己可能会比较多用的大概就这些个%H : 小时(00..23)%M : 分钟(00..59)%S : 秒(00..61)%T : 直接显示时间 (24 小时制)%r ...

2018-06-08 23:33:00 558

原创 命令 echo

1. 输出字符串| echo deng379> deng379| echo "i'm deng379"> i'm deng379如果不带双引号,由于单引号( ' )的存在,回车后无法输出到终端,需要Ctrl+C,才能退回到命令行模式| echo i'm deng379>>>(Ctrl+C)|需要使用转义字符| echo i\'m deng379> ...

2018-06-07 23:58:02 7324 92

Digital Signal Integrity-Modeling and Simulation

Abstract From the Publisher: State-of-the-art techniques for predicting and achieving target performance levels Theory, practice, general signal integrity issues, and leading-edge experimental techniques Model and simulate high-speed digital systems for maximum performance Maximizing the performance of digital systems means optimizing their high-speed interconnections. Digital Signal Integrity gives engineers all the theory and practical methods they need to accurately model and simulate those interconnections and predict real-world performance. Whether you're modeling microprocessors, memories, DSPs, or ASICs, these techniques will get you to market faster with greater reliability. Coverage includes: In-depth reviews of inductance, capacitance, resistance, single and multiconductor transmission lines, generalized termination schemes, crosstalk, differential signaling, and other modeling/simulation issues Multiconductor interconnects: packages, sockets, connectors and buses Modal decomposition: understanding the outputs generated by commercial modeling software Layer peeling with time-domain reflectometry: its power and limitations Experimental techniques for characterizing interconnect parasitics In Digital Signal Integrity, Motorola senior engineer Brian Young presents broad coverage of modeling from data obtained through electromagnetic simulation, transmission line theory, frequency and time-domain modeling, analog circuit simulation, digital signaling, and architecture. Young offers a strong mathematical foundation for every technique, as well as over 100 end-of-chapterproblems. If you're stretching the performance envelope, you must be able to rely on your models and simulations. With this book, you can.

2017-09-26

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