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ifconfig | grep -E "([0-9]{1,3}\.){3}[0-9]{1,3}" | grep -v 127.0.0.1 | awk '{ print $2 }' | cut -f2 -d: | head -n1

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from selenium.webdriver.support.ui import WebDriverWait # available since 2.4.0
from selenium.webdriver.support import expected_conditions as EC # available since 2.26.0
from selenium.webdriver.common.by import By
from selenium import webdriver

# API LIST
# http://seleniumhq.github.io/selenium/docs/api/py/api.html

# explicitly wait for the element to become present
wait = WebDriverWait(driver, 10)

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import re

s = "ABC12DEF3G56HIJ7"
pattern = re.compile(r'([A-Z]+)([0-9]+)')

# all matches
for (letters, numbers) in re.findall(pattern, s):
    print numbers, '*', letters

# It is better to use re.finditer if you dataset is large:

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# The best way to customize your serialization is to get Django to serialize to Python dicts first. Then you can post-process those dicts however you like, before dumping them out to JSON:

from django.core import serializers
import json

# this gives you a list of dicts
raw_data = serializers.serialize('python', Phone.objects.all())
# now extract the inner `fields` dicts
actual_data = [d['fields'] for d in raw_data]
# and now dump to JSON

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https://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html
http://www.taimila.com/blog/ddd-and-testing-strategy/

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Byobu is a suite of enhancements to tmux, as a command line
tool providing live system status, dynamic window management,
and some convenient keybindings:

  F1                             * Used by X11 *
    Shift-F1                     Display this help
  F2                             Create a new window
    Shift-F2                     Create a horizontal split
    Ctrl-F2                      Create a vertical split
    Ctrl-Shift-F2                Create a new session

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# routes.rb

require 'sidekiq'
require 'sidekiq/web'

Sidekiq::Web.use(Rack::Auth::Basic) do |user, password|
  [user, password] == ["sidekiqadmin", "yourpassword"]
end

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File.open(path, 'w') { |file| file.write("your text") }

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2.0.0p0 :001 > require 'matrix'
 => true 
2.0.0p0 :002 > m = Matrix[]
 => Matrix.empty(0, 0) 
2.0.0p0 :003 > m = Matrix.rows(m.to_a << [1,2,3])
 => Matrix[[1, 2, 3]] 
2.0.0p0 :004 > m = Matrix.rows(m.to_a << [2,3,4])
 => Matrix[[1, 2, 3], [2, 3, 4]]

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Cut and paste:

Position the cursor where you want to begin cutting.
Press v to select characters (or uppercase V to select whole lines).
Move the cursor to the end of what you want to cut.
Press d to cut (or y to copy).
Move to where you would like to paste.
Press P to paste before the cursor, or p to paste after.
Copy and paste is performed with the same steps except for step 4 where you would press y instead of d: