[Python] Python SimpleHTTPServer 404 Page

I have recently been using Python's SimpleHTTPServer to host files on my network. I want a custom 404 Page, so I researched this and got some answers, but I want to still use this script I have. So, what do I have to add to get a 404 page to this script?

import sys
import BaseHTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler


HandlerClass = SimpleHTTPRequestHandler
ServerClass = BaseHTTPServer.HTTPServer
Protocol = "HTTP/1.0"

if sys.argv[1:]:
port = int(sys.argv[1])
else:
port = 80
server_address = ('192.168.1.100', port)

HandlerClass.protocol_version = Protocol
httpd = ServerClass(server_address, HandlerClass)

sa = httpd.socket.getsockname()
print "Being served on", sa[0], "port", sa[1], "..."
httpd.serve_forever()

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