By John Goerzen, Brandon Rhodes
ISBN-10: 1430258543
ISBN-13: 9781430258544
Foundations of Python community Programming, 3rd variation, covers all the vintage themes present in the second one version of this publication, together with community protocols, community facts and error, e-mail, server structure, and HTTP and net functions, plus updates for Python 3.
Some of the hot themes during this version include:
• vast insurance of the up to date SSL help in Python 3
• the best way 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 in your Python code.
• How cross-site scripting and cross-site request forgery can be utilized to assault your website, 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 monitor and back.
If you're a Python programmer who wishes a deep figuring out of the way to exploit Python for network-related initiatives and purposes, this can be the publication for you. From net program builders, to platforms integrators, to approach administrators—this booklet has every thing it's good to understand.
Read or Download Foundations of Python Network Programming (3rd Edition) PDF
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Additional resources for Foundations of Python Network Programming (3rd Edition)
Sample text
This means that large packets are more likely to be dropped, since if any one of their pieces fails to make its way to the destination, then the whole packet can never be reassembled and delivered to the listening operating system. Except for the higher chance of failure, this process of fragmenting large UDP packets so that they will fit on the wire should be invisible to your application. There are three ways, however, in which it might be relevant. u If you are thinking about efficiency, you might want to limit your protocol to small packets to make retransmission less likely and to limit how long it takes the remote IP stack to reassemble your UDP packet and give it to the waiting application.
If you are writing a UDP client that lives a long time, think about having it remember how long the last few requests have taken to complete so that it can delay its first retry until the server has had enough time to reply. When you run the Listing 2-2 client,, give it the hostname of the other machine on which you are running the server script, as shown previously. Sometimes, this client will get lucky and get an immediate reply. 1 seconds for a reply The server says 'Your data was 23 bytes long' 26 CHAPTER 2 N UDP However, often it will find that one or more of its requests never results in replies, and it will have to retry.
First, the TCP connect() call—as I discussed a moment ago—is not the innocuous bit of local socket configuration that it is in the case of UDP, where it merely sets a default remote address to be used with any subsequent send() or recv() calls. Here, connect() is a real live network operation that kicks off the three-way handshake between the client and server machine so that they are ready to communicate. This means that connect() can fail, as you can verify quite easily by executing the client when the server is not running.