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  Python internals: how callables work

[The Python version described in this article is 3.x, more specifically - the 3.3 alpha release of CPython.] The concept of a callable is fundamental in Python. When thinking about what can be "called", the immediately obvious answer is functions. Whether it’s user defined functions (written by you), or builtin functions (most probably implemented in C inside the CPython interpreter), functions were meant to be called, right? Well, there are also methods, but they’re not very ...

   Python,Callable work,Rationale     2012-03-24 05:20:27

  Build a Kubectl Plugin from Scratch

by author The command-line tool kubectl is indispensable when using Kubernetes. You need it to query related Pod and Service information both in developing or performing some maintenance operations, such as events, scale, rolling update, etc. However, when using kubectl, there are many inconveniences. Though Kubernetes is officially maintaining kubectl¹, and you can submit the problems, improvement, and even PR in its Github Issues, you still have to wait long before its release. The m...

   KUBENETES,KUBECTL,PLUGIN,GOLANG     2020-12-02 03:43:16

  The Ultimate GetElementsByClassName, Anno 2008

Two and a half years ago, I released the first version of getElementsByClassName. With how web browsers has evolved since, I thought I’d release a real ultimate version, dated 2008. Native Web Browser SupportSafari 3.1 has native getElmentsByClassName support, and upcoming Firefox 3 and Opera 9.5 will have it too. It only leaves out, you’ve guessed it, Internet Explorer.The Necessity Of This ScriptLiving in a world where Microsoft is halting every possible way t...

   JavaScript,geElementsByClassName,Cross browser compatible,Implementation     2011-11-26 02:46:20

  HTML5 Drag and Drop Upload and File API Tutorial

Update #3: Using the techniques outlined in this article I have rolled out and initial release of imgscalr.com.Feel free to download the JS source (it is heavily commented) and take a look at how it was rolled out. Unfortunately the required File API support is only in Chrome and Firefox currently, Safari gets it in version 6, Opera possibly in version 11 and possibly IE 10 (9 has no support).IntroductionOver the last day I’ve been trying to learn how to use the new HTML5 D...

   HTML5,Drag and drop,DnD,File API,Tutorial,Coding     2011-10-29 13:47:14

  Kubernetes Authentication & Authorization 101

If we want to build a system with user modules, Authentication and Authorization are something that we can never ignore, though they could be fuzzy to understand. Authentication (from Greek: αὐθεντικÏŒς authentikos, “real, genuine”, from αὐθέντης authentes, “author”) is the act of proving an assertion, such as the identity of a computer s...

   RBAC,AUTHORIZATION,AUTHENTICATION,KUBERNETES     2021-06-05 23:19:18

  Decision Trees in C#

Decision trees are simple predictive models which map input attributes to a target value using simple conditional rules. Trees are commonly used in problems whose solutions must be readily understandable or explainable by humans, such as in computer-aided diagnostics and credit analysis. Download source code Download sample applications Download the full Accord.NET Framework Introduction Decision Trees give a direct and intuitive way for obtaining the classification of a new instance f...

   C#,Decision tree     2012-03-23 10:00:56

  The Great Tech War Of 2012

From left: The late Apple cofounder Steve Jobs, Facebook CEO Mark Zuckerberg, Google CEO Larry Page, and Amazon CEO Jeff Bezos. | Photos courtesy of David Paul Morris/Getty Images (Jobs); Justin Sullivan/Getty Images (Zuckerberg); Chip East/Reuters (Page); Mario Tama/Getty Images (Bezos).Gilbert Wong, the mayor of Cupertino, California, calls his city council to order. "As you know, Cupertino is very famous for Apple Computer, and we're very honored to have Mr. Steve Jobs come here tonight ...

   2012,Tech war,Facebook,Apple,Google,Amazon,Tablet,Cloud,Analysis     2011-10-17 11:06:25

  Learning Server-Side JavaScript with Node.js

Node.js is all the buzz at the moment, and makes creating high performance, real-time web applications easy. It allows JavaScript to be used end to end, both on the server and on the client. This tutorial will walk you through the installation of Node and your first “Hello World” program, to building a scalable streaming Twitter server.What is Node.js?JavaScript has traditionally only run in the web browser, but recently there has been considerable interest in bringing it to the...

   JavaScript,Server side,Node.js.Implement     2011-09-20 13:33:15

  The Essence of Google Dart: Building Applications, Snapshots, Isolates

WÑ–th thousands of programming languages floating around, why is Google introducing Google Dart? What can it possibly add? The short answer: the Google Dart team wanted a language well suited to modern application development, both on the server and the (mobile) client. Some of Dart's features address problems that languages like Java or Javascript have long had. Dart's Snapshots resemble Smalltalk images, allowing (nearly) instant application startup and wi...

   Dart,Google,Client side,Web,Language,Snapshort,Isolate     2011-10-24 11:41:16

  Cross Browser HTML5 Drag and Drop

HTML5 Drag and Drop has been talked about a lot lately, but it’s hard to find really useful information about implementing it across multiple browsers.Mozilla, Apple and Microsoft all have pages describing how to use it, but their examples seem to work only in their particular browser (Apple’s example doesn’t even work in their own! Updated, Jan. 11, 2009: Although I have not been able to get this example working on Safari 2.0.4 and 3....

   HTML5,Drag and drop, Demo,Source code,Cr     2011-09-20 13:42:45