jboner

Latency Comparison Numbers (~2012)
----------------------------------
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

lttlrck

git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote

0XDE57

ABOUT

about:config settings to harden the Firefox browser. Privacy and performance enhancements.
To change these settings type 'about:config' in the url bar. Then search the setting you would like to change and modify the value. Some settings may break certain websites from functioning and rendering normally. Some settings may also make firefox unstable. I am not liable for any damages/loss of data.

Not all these changes are necessary and will be dependent upon your usage and hardware. Do some research on settings if you don't understand what they do. These settings are best combined with your standard privacy extensions (HTTPS Everywhere No longer required: Enable HTTPS-Only Mode, NoScript/Request Policy, uBlock origin, agent spoofing, Privacy Badger etc), and all plugins set to "Ask To Activate".

defunkt

# Video: http://rubyhoedown2008.confreaks.com/08-chris-wanstrath-keynote.html

Hi everyone, I'm Chris Wanstrath.

When Jeremy asked me to come talk, I said yes.  Hell yes.  Immediately.  But
then I took a few moments and thought, Wait, why?  Why me?  What am I supposed
to say that's interesting?  Something about Ruby, perhaps.  Maybe the
future of it.  The future of something, at least.  That sounds
keynote-y.

dannguyen

Using Python 3 + Google Cloud Vision API's OCR to extract text from photos and scanned documents

Just a quickie test in Python 3 (using Requests) to see if Google Cloud Vision can be used to effectively OCR a scanned data table and preserve its structure, in the way that products such as ABBYY FineReader can OCR an image and provide Excel-ready output.

The short answer: No. While Cloud Vision provides bounding polygon coordinates in its output, it doesn't provide it at the word or region level, which would be needed to then calculate the data delimiters.

On the other hand, the OCR quality is pretty good, if you just need to identify text anywhere in an image, without regards to its physical coordinates. I've included two examples:

####### 1. A low-resolution photo of road signs

bearfrieze

Comprehensions in Python the Jedi way

by Bjørn Friese

Beautiful is better than ugly. Explicit is better than implicit.

-- The Zen of Python

I frequently deal with collections of things in the programs I write. Collections of droids, jedis, planets, lightsabers, starfighters, etc. When programming in Python, these collections of things are usually represented as lists, sets and dictionaries. Oftentimes, what I want to do with collections is to transform them in various ways. Comprehensions is a powerful syntax for doing just that. I use them extensively, and it's one of the things that keep me coming back to Python. Let me show you a few examples of the incredible usefulness of comprehensions.

unixcharles

Look like brew libxml2 and the one bundled with osx are fighting

/Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/libxml-ruby-1.1.4/lib/libxml_ruby.bundle: dlsym(0x7ffb44ee7880, Init_libxml_ruby): symbol not found - /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/libxml-ruby-1.1.4/lib/libxml_ruby.bundle (LoadError)
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/libxml-ruby-1.1.4/lib/libxml.rb:9
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/bundler-1.0.15/lib/bundler/runtime.rb:68:in `require'
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/bundler-1.0.15/lib/bundler/runtime.rb:68:in `require'
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/bundler-1.0.15/lib/bundler/runtime.rb:66:in `each'
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/bundler-1.0.15/lib/bundler/runtime.rb:66:in `require'
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/bundler-1.0.15/lib/bundler/runtime.rb:55:in `each'
	from /Users/unixcharles/.rvm/gems/ruby-1.8.7-p352/gems/bundler-1.0.1

bvssvni

/// Phantom type for step 1.
pub enum Step1 {}
/// Phantom type for step 2.
pub enum Step2 {}

/// Contains data we set step by step.
pub struct Data<'a> {
	/// 'a' is set in the first step.
	a: Option<int>,

puredanger

(require 'clojure.core.async :refer :all)

(def MOVES [:rock :paper :scissors])
(def BEATS {:rock :scissors, :paper :rock, :scissors :paper})

(defn rand-player
  "Create a named player and return a channel to report moves."
  [name]
  (let [out (chan)]
    (go (while true (>! out [name (rand-nth MOVES)])))

abMatGit

Fairly recently we investigated a runtime error while running cron jobs against our subscription purchases. The error stemmed from a class mismatch when a method method_foo was returning a SubscriptionFoo object when we were expecting a SubscriptionBar object. The solution was fairly straight forward, however writing a well-scoped test for method_foo and its return value was not. Why? Because it is often overlooked to write well-scoped tests for relatively large applications in favor of writing narrow-scoped tests that strictly test what you want. Tests should be just as scalable, flexible and maintainable as our main code.

The initial attempt was to test method_foo's class return types: SubscriptionFoo or SubscriptionBar. The code was relatively simple:

describe FooBar do
  describe '#method_foo' do
    context 'when it should return a SubscriptionTypeFoo' do
      ...