快速解析超大XML不占用太大内存

 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