Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and explanations of their meanings.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Once logged in, we are going to run apt-get to install SQLite3."

A block of code is set as follows:

#!/usr/bin/env python
import sqlite3
import urllib2
import json

Any command-line input or output is written as follows:

cd ~
mkdir database
cd database

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "If you see the Getting darker message, try shining your flashlight on the sensor."