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CODE FARM

Installing-Go-from-source

26 Mar 2016

Except as noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code is licensed under a BSD license. Reference: Installing Go from source Installing Go from source Introduction Install Go compiler binaries Install Git, if needed Fetch the repository (Optional) Switch to the...
Effective Go

25 Mar 2016

Reference from Effective Go (golang.org/doc) Overview Go is a new language. Although it borrows ideas from existing languages, it has unusual properties that make effetive Go program different in character from programs written in its relatives. A straightforword tranlation of a C++ or Java program into Go is unlikely to...
Create Jekyll Post with Python

25 Mar 2016

Jekyll-post.py #!/usr/bin/env python # -*- encoding:utf-8 -*- # The MIT License (MIT) # # Copyright (c) 2016 Roy Xu import argparse import time import uuid def main(): parser = argparse.ArgumentParser(description='Jekyll Post') parser.add_argument('title', help='The title of the post.') parser.add_argument('category', help='The categores of the post.') parser.add_argument('--tag', help='The tags of the post.') args...
Tour of Go - Concurrency

18 Sep 2015

Concurrency Goroutines A goroutine is a lightweight thread managed by the Go runtime. go f(x, y, z) starts a new goroutine running f(x, y, z) The evaluation of f, x, y, and z happens in the current goroutine and the execution of f happens in the new goroutine. Goroutines run...
Tour of Go - Methods and interfaces

18 Sep 2015

Methods and interfaces Methods Go does not have classes. However, you can define methods on struct types. The method receiver appears in its own argument list between the func keyword and the method name. package main import ( "fmt" "math" ) type Vertex struct { X, Y float64 } func...
Tour of Go - Basics

17 Sep 2015

Packages, variables, and function Packages Every Go program is made up of packages. Programs start running in package main. This program is using the packages with import paths "fmt" and "math/rand". By convention, the package name is the same as the last element of the import path. For instance, the...
Linux Dev (Debian)

31 Aug 2015

. show linux version $ uname -a $ cat /proc/version $ cat /proc/sys/kernel/{ostype,osrelease,version} $ lsb_release -a $ cat /etc/*release . setterm (Disable PC speaker beep) $ setterm -blength 0 . apt # cd /etc/apt/ # wget http://mirrors.163.com/.help/sources.list.jessie -O sources.list # apt-get update . vim # apt-get install vim basic configuration...
Get started with Django

25 Aug 2015

1. Project $ python -c "import django; print(django.get_version())" 1.1 Django project structure $ django-admin startproject mysite $ tree . `-- mysite |-- manage.py `-- mysite |-- __init__.py |-- settings.py |-- urls.py `-- wsgi.py 2 directories, 5 files The outer mysite/ root direcotry is just a container for your project. Its...
C track: compiling C programs

22 Aug 2015

Orinial：C track: compiling C programs. 尽管有些计算机语言（如 Schema 或者 Basic）通常使用交互式的解释器（当你输入命令后，就可立即执行），但 C 语言不是。C 的源文件总是要通过一个叫做编译器（compiler）的程序编译成二进制代码然后运行。这就是我们接下来要详细说明的几个步骤。几种不同类型的文件你需要4种文件进行编译C 程序：常规的源代码文件（source code）。这些文件包含了函数定义，并约定以 “.c” 作为结尾进行命名。头文件（Header）. 这些文件包含了函数声明（也叫做函数原型）以及各种预处理语句。源文件可以通过头文件访问外部定义的函数。头文件的文件名约定以 “.h” 作为结尾. 目标文件（Object）. 这些文件由编译器的输出而产生。目标文件包含了二进制形式的函数定义，本身是不可执行文件。目标文件的文件名约定以”.o” 结尾，尽管在一些操作系统，如（Windows, MS-DOS），经常以”.obj” 结尾。二进制可执行文件（Binary executables）。这些文件由一个叫做链接器（linker）的程序的输出而产生。链接器链接一些目标文件并产生可以直接执行的二进制文件。二进制可执行文件在 Unix 操作系统上没有后缀名，但在 Windows 上，通常以”.exe” 作为后缀名。还有其他的各种文件，尤其是静态库文件（”.a” files or “.lib” on Windows）以及共享库文件（”.so” files or “.dll” on Windows）。但通常，你不需要直接与他们打交道。预处理在编译器开始编译源文件之前，源文件由预处理器（preprocessor）进行处理。预处理器是一个真实的单独的程序（通常叫做”cpp”, for “C...
Virtualenv for python runtime

06 Aug 2015

virtualenv is a tool to create isolated Python environments. The basic problem being addressed is one of dependencies and versions, and indirectly permissions. Imagine you have an application that needs version 1 of LibFoo, but another application requires version 2. How can you use both these applications? If you install...
pip (package manager)

06 Aug 2015

pip is a package management system used to install and manage software packages written in Python. Many packages can be found in the Python Package Index (PyPI). Python 2.7.9 and later (on the python2 series), and Python 3.4 and later include pip (pip3 for Python 3) by default. pip is...
Head First Desgin Pattern

18 Jan 2014

OO 基础抽象封装多态继承 OO 原则封装变化多用组合，少用继承针对接口编程，不针对实现编程为交互对象之间的松耦合设计而努力(观察者模式) 对扩展开发，对修改关闭（装饰者模式）依赖抽象，不要依赖具体类（工厂模式）最少知识原则：只和你的密友交谈。（外观模式） --得墨忒法则(Law of Demeter) 好莱坞原则：别调用（打电话给）我们，我们会调用（打电话给）你。（模板方法模式）单一职责原则：一个类应该只有一个引起变化的原因。(迭代器模式) OO 模式策略模式 (Strategy pattern) 定义算法族，分别封装起来，让它们之间可以互相替换，此模式让算法的变化独立于使用算法的客户。要点一：知道OO基础，并不足以让你设计出良好的OO系统。良好的OO设计必须具备可复用、可扩充、可维护三个特性。模式可以让我们建造出具有良好OO设计质量的系统。模式被认为是经历史验证的OO设计经验。模式不是代码，而是针对设计问题的的通用解决方案。你可把它们应用到特定的应用中。模式不是被发明，而是被发现。大多数的模式和原则，都是着眼于软件变化的主题。大多数的模式都允许系统局部改变独立于其他部分。我们常把系统会变化的部分抽出来封装。模式让开发人员自己和你有共享的语言，能够最大化沟通的价值。 In the Java Collections framework, sorting of collections is achieved using either Comparable...

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