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 an explanation of their meaning.

Code words in text are shown as follows: " We can sort with the following sort command."

A block of code is set as follows:

import os, pygame
from pygame.locals import *
import numpy
from scipy import ndimage

def get_pixar(arr, weights):
  states = ndimage.convolve(arr, weights, mode='wrap')

  bools = (states == 13) | (states == 12 ) | (states == 3)

  return bools.astype(int)

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

ffmpeg -i <infile> -vcodec mpeg1video -acodec libmp3lame -intra <outfile.mpg>

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "you should see Hello being displayed followed by 1 IMPORTANT MESSAGE! to 19 IMPORTANT MESSAGE!".