Hamza Faran hfaran

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Converting a Word Document to Markdown in Two Moves

The Problem

A lot of important government documents are created and saved in Microsoft Word (*.docx). But Microsoft Word is a proprietary format, and it's not really useful for presenting documents on the web. So, I wanted to find a way to convert a .docx file into markdown.

The Solution

As it turns out, there are several open-source tools that allow for conversion between file types. Pandoc is one of them, and it's powerful. In fact, pandoc's website says "If you need to convert files from one markup format into another, pandoc is your swiss-army knife." But, although pandoc can convert from markdown into .docx, it doesn't work in the other direction.

C# For Python Programmers

Syntax and core concepts

Basic Syntax

Single-line comments are started with //. Multi-line comments are started with /* and ended with */.
C# uses braces ({ and }) instead of indentation to organize code into blocks. If a block is a single line, the braces can be omitted. For example,

	[unix_http_server]
	file=/tmp/supervisor.sock ; path to your socket file

	[supervisord]
	logfile=/var/log/supervisord/supervisord.log ; supervisord log file
	logfile_maxbytes=50MB ; maximum size of logfile before rotation
	logfile_backups=10 ; number of backed up logfiles
	loglevel=error ; info, debug, warn, trace
	pidfile=/var/run/supervisord.pid ; pidfile location
	nodaemon=false ; run supervisord as a daemon

	#!/bin/bash
	#
	# putiodl - put.io cli downloader
	#
	# Copyright (C) 2013 Neal <[email protected]>
	#
	# Dependencies: jq, curl, wget
	#
	# Make sure ~/.putiodl exists and contains your put.io OAuth token.
	#

	# Inspired by:
	# - https://gist.github.com/goldsmith/7262122
	# - https://gist.github.com/brousch/6589386

	#### Some hints ####
	# Currently kivy apps only work on monitor 1 (multiple monitor setup)
	# You have to place the terminal which runs kivy on the monitor 1 or make the app fullscreen.

	# Make sure you have the "command line tools" for mavericks installed!
	# (xcode-select --install)

	{
	"lines.linewidth": 2.0,
	"examples.download": true,
	"patch.linewidth": 0.5,
	"legend.fancybox": true,
	"axes.color_cycle": [
	"#30a2da",
	"#fc4f30",
	"#e5ae38",
	"#6d904f",

	chrome.windows.getAll({populate: true}, function(allWindows)
	{
	console.log(allWindows);
	});