Learning Python Networking

Conventions

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

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "IP addresses have been assigned to your computer by running the ip addr or ipconfig /all command on Windows."

A block of code is set as follows:

import sys, urllib.request try: rfc_number = int(sys.argv[1]) except (IndexError, ValueError): print('Must supply an RFC number as first argument') sys.exit(2) template = 'http://www.ietf.org/rfc/rfc{}.txt' url = template.format(rfc_number) rfc_raw = urllib.request.urlopen(url).read() ...