Python - socket - Client/server example in one thread

socket-client-server.py

import socket

if __name__ == '__main__':
    # socket read/write testing - client and server in one thread
    
    # (techtonik): the stuff below is placed into public domain
    print "-- Testing standard Python socket interface --"

    address = ("127.0.0.1", 9999)
    
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setblocking(0)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind( address )
    server.listen(2)

    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    client.connect( address )

    client.send("data to be catched")
    # accepted server socket is the one we can read from
    # note that it is different from server socket
    accsock, addr = server.accept()
    print '..got "%s" from %s' % (accsock.recv(4096), addr)
    client.send("more data for recv")
    print '..got "%s" from %s' % (accsock.recv(4096), addr)
    
    # accsock.close()
    # client.send("more data for recv")
    #socket.error: [Errno 9] Bad file descriptor
    # accsock, addr = server.accept()
    #socket.error: [Errno 11] Resource temporarily unavailable
    
    client.close()
    server.close()