Python Network Programming Cookbook by Dr. M. O. Faruque Sarker

By Dr. M. O. Faruque Sarker

This booklet highlights significant features of community programming in Python ranging from writing easy networking consumers, to constructing advanced screen-scraping and community protection tracking scripts. It creates the development blocks for plenty of sensible net and networking functions that depend upon quite a few networking protocols. This publication provides the ability and wonder of Python in fixing the varied real-world initiatives within the zone of community programming, process and community management, community tracking, and web-application development.
This booklet develops your skill to resolve quite a lot of community programming projects in Python. we'll commence via exploring the Python ordinary library capabilities to create client/server community and control your neighborhood networking assets to be had below either IPv4 and IPv6. the sensible concentration keeps with developing net and e mail consumers, scraping websites, fetching info from a variety of web content, and looking for info on the net akin to Amazon, Flickr, and different websites. It additional develops your talents to research your community safeguard vulnerabilities utilizing complex community packet seize and research thoughts.

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It may run on any other version with/without modifications. close() if __name__ == '__main__': main() How it works... An instance of ForkingServer is launched in the main thread, which has been daemonized to run in the background. Now, the two clients have started interacting with the server. " Sent: 18 characters, so far... ] PID 12608 received: : Hello echo server! " Sent: 18 characters, so far... ] PID 12608 received: : Hello echo server! The server port number might be different in your machine since this is dynamically chosen by the operating system kernel.

Similarly, the chat server deals with the other client's socket inputs. It relays the data received from any client to others and also shares their joining/leaving information. gethostname(). connected = True # Send my name... error, e: print "Failed to connect to chat server @ port %d" % self. flush() except KeyboardInterrupt: print " Client interrupted. close() break The chat client initializes with a name argument and sends this name to the chat server upon connecting. It also sets up a custom prompt [ name@host ]>.

This will utilize the operating system kernel that will poll network events and let our script know whenever something happens. select approach. How to do it... Let's write a simple web server that can return a single line of text to any connected web browser. epoll() and register our server's file descriptor for event notifications. 7 # It may run on any other version with/without modifications. 3 You will also be able to see the following line in your browser: Hello from Epoll Server! 47 Multiplexing Socket I/O for Better Performance The following screenshot shows the scenario: How it works...

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