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+--- Thread: Python netwoking (/Thread-Python-netwoking--3933)
Python netwoking - ICE_ - 02-01-2013
[shadow=black]PYTHON NETWORKING TUTORIAL[/shadow]
[shadow=green]Imports Needed:[/shadow]
socket
[shadow=red]Objects Used:[/shadow]
- domain - he family of protocols that will be used as the transport mechanism
- type - The type of communications between the two endpoints
- protocol - be used to identify a variant of a protocol within a domain and type.
- host - The identifier of a network interface
- port - the port number to connect to the server
[shadow=blue]Examples/explenations of networking:[/shadow]
Code:
s = socket.socket (socket_family, socket_type, protocol=0)To network in python we need to make initialize a socket variable, the above code does this and uses 3 separate variables to set up the socket. These variables are:
- socket_family - either AF_UNIX or AF_INET (inet uses tcp/ip while unix creates a filesystem object)
- socket_type - either SOCK_STREAM (for connection-oriented protocols) or SOCK_DGRAM (for connectionless protocols)
- protocol - left out, default at 0
Sockets have methods for both the client and the server side of a program.
Server commands:
bind() - binds to an address
listen() - sets up and starts a TCP listener
accept() - allows clients to connect through TCP connections
Client commands:
connect() - connects to a server through a tcp connections
General commands:
recv() - receives TCP message
send() - sends TCP message
recvfrom() - receives UDP message
sendto() - sends UDP message
close() - closes socket
gethostname() - returns the hostname
an example of a server:
Code:
#!/usr/bin/python # This is server.py file
import socket # Import socket module
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
port = 2223 # Reserve a port for your service.
s.bind((host, port)) # Bind to the port
s.listen(5) # Now wait for client connection.
while True:
c, addr = s.accept() # Establish connection with client.
print 'Got connection from', addr
c.send('Thank you for connecting')
c.close() # Close the connectionan example of a client:
Code:
#!/usr/bin/python # This is client.py file
import socket # Import socket module
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
port = 2223 # Reserve a port for your service.
s.connect((host, port))
print s.recv(1024)
s.close # Close the socket when done[shadow=black]I HOPE THIS TUTORIAL HELPED YOU! KEEP AN EYE OUT FOR MY OTHER NETWORKING TUTORIALS FOR DIFFERENT LANGUAGES![/shadow]