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Transforming an XML Document from its Parse Tree

import sys from xml.dom.ext import PrettyPrint from xml.dom import minidom doc = minidom.parse(open(sys.argv[1])) def walk_tree(n,func):     while n:         func(n)         walk_tree(n.firstChild,func)         n = n.nextSibling def fix_node(n):     if n.nodeType == n.ELEMENT_NODE:         if n.tagName == "ingredients":             n.tagName = "ingredientlist"         if n.tagName == "item":             n.tagName = "ingredient"             attr = n.getAttribute("num")             n.setAttribute("quantity",attr)             n.removeAttribute("num") walk_tree(doc,fix_node) PrettyPrint(doc)