There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "It's possible to kill a process immediately by using the terminate method."

A block of code is set as follows:

import socket
port=60000
s =socket.socket()
host=socket.gethostname()

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

 p = multiprocessing.Process(target=foo)
 print ('Process before execution:', p, p.is_alive())
 p.start()

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

> python server.py

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Go to System Properties | Environment Variables | User or System variables | New."