Python SimpleHTTPServer with CORS, supporting both Python 2 and 3

simple_http_server_cors.py

#!/usr/bin/env python

# Usage: python simple_http_server_cors.py <port>

try:
    # try to use Python 3
    from http.server import HTTPServer, SimpleHTTPRequestHandler, test as test_orig
    import sys
    def test (*args):
        test_orig(*args, port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000)
except ImportError: # fall back to Python 2
    from BaseHTTPServer import HTTPServer, test
    from SimpleHTTPServer import SimpleHTTPRequestHandler

class CORSRequestHandler (SimpleHTTPRequestHandler):
    def end_headers (self):
        self.send_header('Access-Control-Allow-Origin', '*')
        SimpleHTTPRequestHandler.end_headers(self)

if __name__ == '__main__':
    test(CORSRequestHandler, HTTPServer)

Nice code. Works very nicely!

One question: What is the purpose of wrapping the code in test()? I'm not sure what that does.
edit: I see now test is a method in the http.server module that runs the server.