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[python][network]   simplest networking

Posted on 2007-11-23
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Last Modified: 2010-04-16
I just want python to send a line of text to the other script on the other computer


they are on the same network,

so,

just a server script listening for

a client script sending one line of text,


is it possible?
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Question by:Troudeloup
2 Comments
 
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by:ramrom
ID: 20341256
Yes - see the socket module
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pepr earned 500 total points
ID: 20344140
If you are allowed, see the question http:#21995292 and the answers. If you cannot search for the answers, here are copies of my answers...

1) Focus on the built-in module socket (Python doc "7.2 socket -- Low-level networking interface"). See the examples:

http://www.qiksearch.com/python/sockets/server.py
http://www.qiksearch.com/python/sockets/client.py

They are a bit old and could be written aestetically better, but they show the principle. (Add the line UDPSock.sendto('', addr) before the break to finish the server when sending empty line.)

Later, you may get info and inspiration in the standard module SocketServer Python doc ("11.16 SocketServer -- A framework for network servers")

Use the snippets below, store them in separate files -- one for the server, one for the client. The UDP is the simplest form of usage of the IP protocol. See http://en.wikipedia.org/wiki/User_Datagram_Protocol. More reliable transfer can be done via TCP (see http://en.wikipedia.org/wiki/Transmission_Control_Protocol).
# Server program
 
import socket
 
# Set the socket parameters
addr = ('', 33333)  # host, port
 
# Create socket and bind to address
UDPSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
UDPSock.bind(addr)
 
# Receive messages
while True:
    data, addr = UDPSock.recvfrom(1024)
    if data == 'stop':
        print 'Client wants me to stop.'
        break
    else:
        print "From addr: '%s', msg: '%s'" % (addr[0], data)
 
# Close socket
UDPSock.close()
print 'Server stopped.'
 
---------------------------------------------------------------
 
# Client program
 
import socket
 
 
#addr = ('localhost', 33333)                                # localhost, port
#addr = ('127.0.0.1', 33333)                                # localhost explicitly
#addr = ('xyz', 33333)                                      # explicit computer
#addr = ('<broadcast>', 33333)                              # broadcast address
addr = ('255.255.255.255', 33333)                          # broadcast address explicitly
 
UDPSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Create socket
 
print 'Enter your message:'
print '- Empty message to stop this client.'
print '- "stop" to stop all servers.'
 
# Almost infinite loop... ;)
while True:
    data = raw_input('>> ')
    if len(data) == 0:
        break
    else:
        if UDPSock.sendto(data, addr):
            print "Sending message '%s'..." % data
 
UDPSock.close()             # Close socket
print 'Client stopped.'

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