Comment out a namespace in an xmlfile, breaking any other comments within the namespace first

xmlcommentor.py

from xml.dom import minidom
import os, time, shutil

xmlfile=('<xmlfile here')
resultFile='result.xml'
commentSub=('<namespacehere>')

now=str(int(time.time()))
bkup=(xmlfile+now)
shutil.copy2(xmlfile, bkup)

xmldoc = minidom.parse(xmlfile)
itemlist = xmldoc.getElementsByTagName('subsystem')
for s in itemlist:
        if commentSub in s.attributes['xmlns'].value:
            commentText = s.toxml()
            commentText = commentText.replace('--', '- -')
            s.parentNode.insertBefore(xmldoc.createComment(commentText), s)
            s.parentNode.removeChild(s)
file = open("result.xml", "wb")
xmldoc.writexml(file)
file.write('\n')
file.close()

shutil.copy2(resultFile, xmlfile)