import xml.etree.ElementTree as ET

 def parse_res(xml_file):

     res_dic = {}

     tmp_lst_lev1 = []

     tmp_lst_lev2 = []

     add_flag = False

     for event, elem in ET.iterparse(xml_file):

         if event == 'end':

             if elem.tag == 'Item':

                 tmp_lst_lev1.append(dict(elem.attrib))

             elif elem.tag == 'Enum':

                 enum_str = ''.join([ ''.join(['[', item['value'], '=', item['name'], ']']) for item in tmp_lst_lev1])

                 res_enum = {}

                 res_enum['id'] = elem.attrib['id']

                 res_enum['name'] = enum_str

                 tmp_lst_lev2.append(res_enum)

                 tmp_lst_lev1 = []

             elif elem.tag == 'EnumRes':

                 res_dic['EnumRes'] = {}

                 tmp_dic = res_dic['EnumRes']

                 for item in tmp_lst_lev2:

                     tmp_dic[ item['id'].split('.')[1] ] = item['name']

                 tmp_lst_lev2 = []

             elif elem.tag == 'MeasUnitRes' or elem.tag == 'CounterNameRes' or elem.tag == 'CounterUnitRes':

                 res_dic[elem.tag] = {}

                 tmp_dic = res_dic[elem.tag]

                 for item in tmp_lst_lev1:

                     tmp_dic[ item['id'].split('.')[1] ] = item['name']

                 tmp_lst_lev1 = []

             #CommonInfo.Resource.xml

             elif elem.tag == 'DevTypeNameRes' or elem.tag == 'VendorRes' or elem.tag == 'MocRes':

                 res_dic[elem.tag] = {}

                 tmp_dic = res_dic[elem.tag]

                 for item in tmp_lst_lev1:

                     tmp_dic['id'] = item['id'].split('.')[1]

                     tmp_dic['name'] = item['name']

                 tmp_lst_lev1 = []

             #StaticList.xml

             elif elem.tag == 'param':

                 if 'alarmId' == elem.attrib['name']:

                     id = elem.text

             elif elem.tag == 'alarm':

                 tmp_lst_lev1.append([id, elem.attrib['name']])

             elif elem.tag == 'alarms':

                 res_dic[elem.tag] = {}

                 tmp_dic = res_dic[elem.tag]

                 for item in tmp_lst_lev1:

                     tmp_dic[ item[0] ] = item[1]

                 tmp_lst_lev1 = []

         elem.clear()   #关键在这一名，处理完节点及时清理内存

     return res_dic