Sam Washington, Faruque Sarker's Learning Python Network Programming PDF

By Sam Washington, Faruque Sarker

Community programming has continually been a hard activity. With full-featured and good documented libraries all of the manner up the stack, Python makes community programming the relaxing adventure it's going to be.

Starting with a walkthrough of today's significant networking protocols, with this booklet you'll easy methods to hire Python for community programming, the right way to request and retrieve internet assets, and the way to extract info in significant codecs over the internet. You'll make the most of Python for e-mailing utilizing diverse protocols and you'll engage with distant platforms and IP and DNS networking.

As the booklet progresses, socket programming might be lined, by means of find out how to layout servers and the professionals and cons of multithreaded and event-driven architectures. You'll enhance sensible client-side functions, together with internet API consumers, e mail consumers, SSH, and FTP. those purposes can also be applied via present net program frameworks.

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Example text

The application layer protocol has employed a transport layer protocol (which in this case is TCP). Right at the bottom of the traceback, we can see the exception itself and the Errno 111. This is an error message from the operating system. h on some systems) for the error message number 111 (on Windows the error will be a WinError, so you can see that it has clearly been generated by the OS). From this error message we can see that the socket module is calling down yet again and asking the operating system to manage the TCP connection for it.

Alternatively, it can be written as a subnet mask, which is sometimes just called a netmask. This is the way in which you will usually see n being specified in a device's network configuration. A subnet mask is a 32-bit number written in dot-decimal notation, just like an IP address. 0 This subnet mask is equivalent to /24. We get n from it by looking at it in binary. 240 = = = = 11111111 11111111 11111111 11111111 00000000 11000000 11111111 11111111 00000000 00000000 11111111 11111111 00000000 00000000 00000000 11110000 = = = = /8 /10 /24 /28 n is simply the number of 1 bits in the subnet mask.

In some large or specialized networks, you will find that there is more than one point of connection, but for the sake of simplicity we'll stick to a single connection here. This connection point is called a gateway, and usually it takes the form of a special network device called a router. The job of a router is to direct traffic between networks. It sits between two or more networks and is said to sit at the boundary of these networks. It always has two or more network interfaces; one for each network it is attached to.

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