download url

# 2013-05-26 johnpfeiffer
from twisted.internet import reactor
from twisted.web.client import downloadPage
import sys

def printError( failure ):
    print >>sys.stderr, failure

def stop( result ):
    reactor.stop()

if __name__ == '__main__':

    if len(sys.argv) != 3:
        print >>sys.stderr, "Usage: python download_resource.py <URL> <output file>"
        exit( 1 )

    d = downloadPage( sys.argv[1], sys.argv[2] )
    d.addErrback( printError )
    d.addBoth( stop )
    reactor.run()

    try:
        with open( sys.argv[2]) as file:
            for line in file:
                print line,
    except IOError as error:
        print >>sys.stderr, error