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

By John Goerzen, Brandon Rhodes

Foundations of Python community Programming, 3rd version, covers the entire vintage themes present in the second one version of this e-book, together with community protocols, community information and mistakes, e-mail, server structure, and HTTP and net purposes, plus updates for Python 3.

Some of the hot subject matters during this version include:

• vast insurance of the up-to-date SSL help in Python 3
• the best way to write your personal asynchronous I/O loop.
• an summary of the "asyncio" framework that incorporates 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 internet 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 initiatives and functions, this is often the booklet for you. From net software builders, to structures integrators, to method administrators—this booklet has every little thing it's essential recognize.

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

Sample text

U SO_DONTROUTE: Only be willing to send packets that are addressed to hosts on subnets to which this computer is connected directly. 0/24 if this socket option were set, but it would not be willing to send them anywhere else because the packets would then have to be routed through a gateway. u SO_TYPE: When passed to getsockopt(), this returns to you whether a socket is of type SOCK_DGRAM and can be used for UDP or whether it is of type SOCK_STREAM and instead supports the semantics of TCP (see Chapter 3).

This serves the important purpose of surviving a few dropped requests or replies, while making it possible that a congested network will slowly recover as all of the active clients back off on their demands and gradually send fewer packets. Although there exist fancier algorithms for exponential backoff—for example, the Ethernet version of the algorithm adds some randomness so that two competing network cards are unlikely to back off on exactly the same schedule—the basic effect can be achieved quite simply by doubling the delay each time that a reply is not received.

Reread the section “Port Numbers” in that chapter if you want to review the details. As you saw in the previous chapter, it takes only a single socket to speak UDP: a server can open a UDP port and then receive datagrams from thousands of different clients. While it is certainly possible to connect() a datagram socket to a particular peer so that the socket will always send() to only that peer and recv()packets sent back from that peer, the idea of a connection is just a convenience. The effect of connect() is exactly the same as your application simply deciding, on its own, to send to only one address with sendto() calls and then ignore responses from any but that same address.

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