#!/usr/bin/python
# USAGE:   echo_server_sockets.py <PORT>
#
# EXAMPLE: echo_server_sockets.py 8000

import socket
import sys

def to_upper(string):
    upper_case = ""
    for character in string:
         if 'a' <= character <= 'z':
             location = ord(character) - ord('a')
             new_ascii = location + ord('A')
             character = chr(new_ascii)
         upper_case = upper_case + character
    return upper_case

if len(sys.argv) < 2:
    print "USAGE:   echo_server_sockets.py <PORT>"
    sys.exit(0)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = ''
port = int(sys.argv[1])
s.bind((host, port))
s.listen(1)
while (1):
    conn, addr = s.accept()
    print 'client is at', addr
    data = conn.recv(1000000)
    updata = to_upper(data)
    print 'sending data ', updata
    conn.send(updata)
    conn.close()