keenhenry / equal_element_array_transformation.py

Last active August 29, 2015 14:18

Equal-element array transformation problem

	#!/usr/bin/env python

	"""Problem Description:

	There is an array consisting of N elements, all the elements are integer numbers (can be positive, zero or negative).

	A transformation step is to be applied to the array, which is detailed as follows:

	Each element has to be incremented or decremented by 1 in a single step

keenhenry / index.html

Last active August 29, 2015 14:26 — forked from jonnyreeves/index.html

JavaScript Class Structure using requireJS. The following code shows you how to create a Class definition in one JavaScript file and then import it for use in another; coming from an ActionScript 3 background this (and some of JavaScript specific traits)

	<!DOCTYPE html>
	<html>
	<head>
	<script data-main="usage" src="http://requirejs.org/docs/release/1.0.8/comments/require.js"></script>
	</head>
	<body>
	<p>Check your JavaScript console for output!</p>
	</body>
	</head>

keenhenry / DisjointSet.java

Created August 22, 2015 10:43

Disjoint Set Data Structure

	public class DisjSets
	{
	public DisjSets( int numElements )
	{
	s = new int [ numElements ];

	for ( int i = 0; i < s.length; ++i )
	s[i] = -1;
	}

keenhenry / bobp-python.md

Created November 8, 2015 09:55 — forked from sloria/bobp-python.md

A "Best of the Best Practices" (BOBP) guide to developing in Python.

The Best of the Best Practices (BOBP) Guide for Python

A "Best of the Best Practices" (BOBP) guide to developing in Python.

In General

Values

"Build tools for others that you want to be built for you." - Kenneth Reitz
"Simplicity is alway better than functionality." - Pieter Hintjens

keenhenry / beautiful_idiomatic_python.md

Created February 14, 2016 20:51 — forked from JeffPaine/beautiful_idiomatic_python.md

Transforming Code into Beautiful, Idiomatic Python: notes from Raymond Hettinger's talk at pycon US 2013. The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.

The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]:

keenhenry / Print Python's Exception objects hierarchy

Created March 5, 2016 15:44

A small script to print out the Exception inheritance hierarchy. Useful for writing exception handling (Python 2.5+)

	#!/usr/bin/env python

	def classtree(cls, indent=0):
	print '.' * indent, cls.__name__
	for subcls in cls.__subclasses__():
	classtree(subcls, indent + 3)

	classtree(BaseException)

keenhenry / latency.txt

Created March 20, 2016 10:01 — forked from jboner/latency.txt

Latency Numbers Every Programmer Should Know

	Latency Comparison Numbers
	--------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

keenhenry / scopes.py

Created March 31, 2016 19:27

Python Scopes Quirks

	#!/usr/bin/env python

	# name binding always creates a name in the local scope
	ng = 'a global'
	def f():
	# without the following commented out line, UnboundLocalError will throw
	# global ng
	nl = 2
	print ng, nl
	ng = 3

keenhenry / script.bash

Created April 16, 2016 20:04 — forked from jiaaro/script.bash

Embed Python in a bash script

	#!/bin/bash

	export FOO=100

	python - <<END

	import os
	print "foo:", os.environ['FOO']

	END

keenhenry / mkdir_p.py

Last active October 29, 2016 16:54

The implementation of `$ mkdir -p path` in Python: http://stackoverflow.com/questions/600268/mkdir-p-functionality-in-python

	#!/usr/bin/env python
	# -- coding: utf-8 --

	from __future__ import print_function

	import errno
	import os

	def mkdir_p(path):
	try:

Henry Huang keenhenry

The Best of the Best Practices (BOBP) Guide for Python

In General

Values

Transforming Code into Beautiful, Idiomatic Python

Looping over a range of numbers