Python network programming

Python network programming

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  Swipe Python - NetworkProgramming
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  Python provides twolevels of access to network services. At a low level, you can access the basic socket support in the underlying operating system, which allows you to implement clients and servers for both connection-oriented and connectionless protocols. Python also has libraries that provide higher-level access to specific application-level network protocols, such as FTP, HTTP, and so on. This PDF gives you understanding on most famous concept in Networking - Socket Programming. Python - Network Programming
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  Sockets are theendpoints of a bidirectional communications channel. Sockets may communicate within a process, between processes on the same machine, or between processes on different continents. Sockets may be implemented over a number of different channel types: Unix domain sockets, TCP, UDP, and so on. The socket library provides specific classes for handling the common transports as well as a generic interface for handling the rest. What are Sockets?
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  Sockets have theirown vocabulary Domain The family of protocols that is used as the transport mechanism. These values are constants such as AF_INET, PF_INET, PF_UNIX, PF_X25, and so on. type The type of communications between the two endpoints, typically SOCK_STREAM for connection-oriented protocols and SOCK_DGRAM for connectionless protocols. protocol Typically zero, this may be used to identify a variant of a protocol within a domain type. Term & Description
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  port Each server listensfor clients calling on one or more ports. A port may be a Fixnum port number, a string containing a port number, or the name of a service. hostname The identifier of a network interface − A string, which can be a host name, a dotted-quad address, or an IPV6 address in colon (and possibly dot) notation A string "<broadcast>", which specifies an INADDR_BROADCAST address. A zero-length string, which specifies INADDR_ANY, or An Integer, interpreted as a binary address in host byte order. Term & Description
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  The socket Module Tocreate a socket, you must use the socket.socket() function available in socket module, which has the general syntax, s = socket.socket (socket_family, socket_type, protocol=0) Here is the description of the parameters − socket_family − This is either AF_UNIX or AF_INET, as explained earlier. socket_type − This is either SOCK_STREAM or SOCK_DGRAM. protocol − This is usually left out, defaulting to 0.
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  Server Socket Methods s.bind() Thismethod binds address (hostname, port number pair) to socket. s.listen() This method sets up and start TCP listener. s.accept() This passively accept TCP client connection, waiting until connection arrives (blocking). Method & Description
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  Client Socket Methods s.connect() Thismethod actively initiates TCP server connection. Method & Description
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  General Socket Methods s.recv() Thismethod receives TCP message s.send() This method transmits TCP message s.recvfrom() This method receives UDP message s.sendto() This method transmits UDP message s.close() This method closes socket Method & Description
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