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 an explanation of their meaning.

Code words in text are shown as follows: "We can include other contexts through the use of the include directive."

A block of code is set as follows:

from urllib.request import urlopen
from urllib.error import URLError

url = 'http://example.webscraping.com'
try:
    html = urlopen(url).read()
except urllib2.URLError as e:
    html = None

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

python script.py

We will occasionally show Python interpreter prompts used by the normal Python interpreter, such as:

>>> import urllib

Or the IPython interpreter, such as:

In [1]: import urllib

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: "clicking the Next button moves you to the next screen".