Python获取任意xml节点值的方法

# -*- coding: utf-8 -*-
import xml.dom.minidom
ELEMENT_NODE = xml.dom.Node.ELEMENT_NODE
class SimpleXmlGetter(object):
  def __init__(self, data):
    if type(data) == str:
      self.root = xml.dom.minidom.parse(data)
    else:
      self.root = data
  def __getattr__(self, name):    #support . operation
    if name == 'data':
      return self.root.firstChild.data
    for c in self.root.childNodes:
      if c.nodeType == ELEMENT_NODE and c.tagName == name:
        return SimpleXmlGetter(c)
  def __getitem__(self, index):    #support [] operation
    eNodes = [ e for e in self.root.parentNode.childNodes
          if e.nodeType == ELEMENT_NODE and e.tagName == self.root.tagName]
    return SimpleXmlGetter(eNodes[index])
  def __call__(self, *args, **kwargs): #support () openration, for query conditions
    for e in self.root.parentNode.childNodes:
      if e.nodeType == ELEMENT_NODE:
        for key in kwargs.keys():
           if e.getAttribute(key) != kwargs[key]:
            break
        else:
          return SimpleXmlGetter(e)
if __name__ == "__main__":
  x = SimpleXmlGetter("sysd.xml")
  print x.sysd.sysagent.param[2].data
  print x.sysd.sysagent.param(name="querytimeout", type="second").data