Foundations of Python Network Programming (3rd Edition) by John Goerzen, Brandon Rhodes PDF

By John Goerzen, Brandon Rhodes

Foundations of Python community Programming, 3rd version, covers all the vintage themes present in the second one version of this ebook, together with community protocols, community facts and blunders, e mail, server structure, and HTTP and net functions, plus updates for Python 3.

Some of the hot themes during this version include:

• wide assurance of the up to date SSL help in Python 3
• find out how to write your individual asynchronous I/O loop.
• an outline of the "asyncio" framework that includes Python 3.4.
• How the Flask net framework connects URLs for your Python code.
• How cross-site scripting and cross-site request forgery can be utilized to assault your site, and the way to guard opposed to them.
• How a full-stack net framework like Django can automate the around journey out of your database to the reveal and back.

If you're a Python programmer who wishes a deep knowing of ways to take advantage of Python for network-related projects and functions, this can be the ebook for you. From internet program builders, to platforms integrators, to process administrators—this booklet has every little thing you'll want to comprehend.

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Additional resources for Foundations of Python Network Programming (3rd Edition)

Sample text

An important feature of this client program is what happens if the timeout is reached. It does not simply start sending out repeat requests over and over again at a fixed interval! Since the leading cause of packet loss is congestion—as anyone knows who has tried sending normal data upstream over a DSL modem at the same time that photographs or videos are uploading—the last thing you want to do is to respond to a possibly dropped packet by sending even more of them. Therefore, this client uses a technique known as exponential backoff, where its attempts become less and less frequent.

0. 0', 1060) Each time a request is received, the server will use a random() flip of the coin to decide whether this request will be answered so that you do not have to keep running the client all day while waiting for a real dropped packet. Whichever decision it makes, it prints a message to the screen so that you can keep up with its activity. How do we write a “real” UDP client, one that has to deal with the fact that packets might be lost? 25 CHAPTER 2 N UDP First, UDP’s unreliability means that the client has to perform its request inside a loop.

UDP Fragmentation I have been speaking so far in this chapter as though UDP lets you, as a user, send raw datagrams that are simply packaged up as IP packets with just a little bit of additional information—a port for both the sender and receiver. But you might already have become suspicious because the foregoing program listings have suggested that a UDP packet can be up to 64kB in size, whereas you probably already know that your Ethernet or wireless card can only handle packets of around 1,500 bytes instead.

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