By Brandon Rhodes, John Goerzen (auth.)
Foundations of Python community Programming, Third Edition, covers all the vintage issues present in the second one variation of this publication, together with community protocols, community information and error, e mail, server structure, and HTTP and net functions, plus updates for Python 3.
Some of the hot subject matters during this variation include:
• vast assurance of the up-to-date SSL help in Python 3
• the right way to write your personal asynchronous I/O loop.
• an outline of the "asyncio" framework that includes Python 3.4.
• How the Flask internet framework connects URLs on 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 internet framework like Django can automate the around journey out of your database to the display and back.
If you are a Python programmer who wishes a deep realizing of the way to exploit Python for network-related initiatives and functions, this can be the publication for you. From net software builders, to structures integrators, to process administrators—this e-book has every thing you have to know.
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Extra resources for Foundations of Python Network Programming: Third Edition
P) In Chapter 2, I approached the subject of bind() quite carefully, since the address you provide as its argument makes an important choice: it determines whether remote hosts can try connecting to our server or whether your server is protected against outside connections and can be contacted only by other programs running on the same machine. Accordingly, Chapter 2 started with safe program listings that bound themselves only to the loopback interface and then progressed to more dangerous program listings that accepted connections from other hosts on the network.
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 ■ UDP First, UDP’s unreliability means that the client has to perform its request inside a loop.
I have already discussed binding—both the explicit bind() call that a server uses to grab the address that it wants to use and the implicit binding that takes place when the client first tries to use a socket and is assigned a random ephemeral port number by the operating system. But the remote UDP client in Listing 2-2 also uses a new call that I have not discussed before: the connect() socket operation. You can see easily enough what it does. Instead of having to use sendto() with an explicit address tuple every time you want to send something to the server, the connect() call lets the operating system know ahead of time the remote address to which you want to send packets so that you can simply supply data to the send() call and not have to repeat the server address again.