Python CODE——Nonblocking I/O client AND Delaying Server

#!Nonblocking I/O - Chapter 5 -pollclient.py
import socket,sys,select
port=51423
host='localhost'

spinsize=10
spinpos=0
spindir=1

def spin():
    global spinsize,spinpos,spindir
    spinstr='.'*spinpos+'|'+'.'*(spinsize-spinpos-1)
    sys.stdout.write('
'+spinstr+'  ')
    sys.stdout.flush()

    spinpos+=spindir
    if spinpos<0:
        spindir=1
        spinpos=1
    elif spinpos>=spinsize:
        spinpos-=2
        spindir=-1

sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.connect((host,port))

p=select.poll()
p.register(sock.fileno(),select.POLLIN|select.POLLERR|select.POLLHUP)

while True:
    results=p.poll(2002)
    if len(results):
        if results[0][1]==select.POLLIN:
            data=sock.recv(4096).decode()
            if not len(data):
                print("
Remote end closed connection; exiting.")
                break
        sys.stdout.write("
Received :"+data)
        sys.stdout.flush()
        spin()
    else:
        print("
Problem occurred; exiting")
        sys.exit(0)

#!Delaying Server - Chapter 5 -delayserver.py
import socket,traceback,time

host=""
port=51423

sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
sock.bind((host,port))
sock.listen(1)

while True:
    try:
        clientsock,clientaddr= sock.accept()
    except KeyboardInterrupt:
        raise
    except:
        traceback.print_exc()
        continue

    try:
        print("Got connection from ",clientsock.getpeername)
        while True:
            try:
                print(time.asctime().encode())
                clientsock.sendall(time.asctime().encode()+b"
")
            except:
                break
            time.sleep(2)
    except (KeyboardInterrupt,SystemExit):
        raise
    except:
        traceback.print_exc()

    try:
        clientsock.close()
    except KeyboardInterrupt:
        raise
    except:
        traceback.print_exc()