横向对比分析Python解析XML的四种方式

 print("文件计数：%d/%d." % (gz_cnt,paser_num))
 str_s,cnt = dom_parser(gz)
 #str_s,cnt = sax_parser(gz)
 #str_s,cnt = ET_parser(gz)
 #str_s,cnt = ET_parser_iter(gz)
 output.write(str_s)
 vs_cnt += cnt

def dom_parser(gz):
 import gzip,cStringIO
 import xml.dom.minidom
 
 vs_cnt = 0
 str_s = ''
 file_io = cStringIO.StringIO()
 xm = gzip.open(gz,'rb')
 print("已读入：%s.
解析中：" % (os.path.abspath(gz)))
 doc = xml.dom.minidom.parseString(xm.read())
 bulkPmMrDataFile = doc.documentElement
 #读入子元素
 enbs = bulkPmMrDataFile.getElementsByTagName("eNB")
 measurements = enbs[0].getElementsByTagName("measurement")
 objects = measurements[0].getElementsByTagName("object")
 #写入csv文件
 for object in objects:
 vs = object.getElementsByTagName("v")
 vs_cnt += len(vs)
 for v in vs:
 file_io.write(enbs[0].getAttribute("id")+' '+object.getAttribute("id")+' '+
 object.getAttribute("MmeUeS1apId")+' '+object.getAttribute("MmeGroupId")+' '+object.getAttribute("MmeCode")+' '+
 object.getAttribute("TimeStamp")+' '+v.childNodes[0].data+'
') #获取文本值
 str_s = (((file_io.getvalue().replace(' 
','
')).replace(' ',',')).replace('T',' ')).replace('NIL','')
 xm.close()
 file_io.close()
 return (str_s,vs_cnt)

def sax_parser(gz):
 import os,gzip,cStringIO
 from xml.parsers.expat import ParserCreate

 #变量声明
 d_eNB = {}
 d_obj = {}
 s = ''
 global flag 
 flag = False
 file_io = cStringIO.StringIO()
 
 #Sax解析类
 class DefaultSaxHandler(object):
 #处理开始标签
 def start_element(self, name, attrs):
 global d_eNB
 global d_obj
 global vs_cnt
 if name == 'eNB':
 d_eNB = attrs
 elif name == 'object':
 d_obj = attrs
 elif name == 'v':
 file_io.write(d_eNB['id']+' '+ d_obj['id']+' '+d_obj['MmeUeS1apId']+' '+d_obj['MmeGroupId']+' '+d_obj['MmeCode']+' '+d_obj['TimeStamp']+' ')
 vs_cnt += 1
 else:
 pass
 #处理中间文本
 def char_data(self, text):
 global d_eNB
 global d_obj
 global flag
 if text[0:1].isnumeric():
 file_io.write(text)
 elif text[0:17] == 'MR.LteScPlrULQci1':
 flag = True
 #print(text,flag)
 else:
 pass
 #处理结束标签
 def end_element(self, name):
 global d_eNB
 global d_obj
 if name == 'v':
 file_io.write('
')
 else:
 pass
 
 #Sax解析调用
 handler = DefaultSaxHandler()
 parser = ParserCreate()
 parser.StartElementHandler = handler.start_element
 parser.EndElementHandler = handler.end_element
 parser.CharacterDataHandler = handler.char_data
 vs_cnt = 0
 str_s = ''
 xm = gzip.open(gz,'rb')
 print("已读入：%s.
解析中：" % (os.path.abspath(gz)))
 for line in xm.readlines():
 parser.Parse(line) #解析xml文件内容
 if flag:
 break
 str_s = file_io.getvalue().replace(' 
','
').replace(' ',',').replace('T',' ').replace('NIL','') #写入解析后内容
 xm.close()
 file_io.close()
 return (str_s,vs_cnt)

def ET_parser(gz):
 import os,gzip,cStringIO
 import xml.etree.cElementTree as ET

 vs_cnt = 0
 str_s = ''
 file_io = cStringIO.StringIO()
 xm = gzip.open(gz,'rb')
 print("已读入：%s.
解析中：" % (os.path.abspath(gz)))
 tree = ET.ElementTree(file=xm)
 root = tree.getroot()
 for elem in root[1][0].findall('object'):
 for v in elem.findall('v'):
 file_io.write(root[1].attrib['id']+' '+elem.attrib['TimeStamp']+' '+elem.attrib['MmeCode']+' '+
 elem.attrib['id']+' '+ elem.attrib['MmeUeS1apId']+' '+ elem.attrib['MmeGroupId']+' '+ v.text+'
')
 vs_cnt += 1
 str_s = file_io.getvalue().replace(' 
','
').replace(' ',',').replace('T',' ').replace('NIL','') #写入解析后内容
 xm.close()
 file_io.close()
 return (str_s,vs_cnt)

def ET_parser_iter(gz):
 import os,gzip,cStringIO
 import xml.etree.cElementTree as ET

 vs_cnt = 0
 str_s = ''
 file_io = cStringIO.StringIO()
 xm = gzip.open(gz,'rb')
 print("已读入：%s.
解析中：" % (os.path.abspath(gz)))
 d_eNB = {}
 d_obj = {}
 i = 0
 for event,elem in ET.iterparse(xm,events=('start','end')):
 if i >= 2:
 break 
 elif event == 'start':
 if elem.tag == 'eNB':
 d_eNB = elem.attrib
 elif elem.tag == 'object':
 d_obj = elem.attrib
 elif event == 'end' and elem.tag == 'smr':
 i += 1
 elif event == 'end' and elem.tag == 'v':
 file_io.write(d_eNB['id']+' '+d_obj['TimeStamp']+' '+d_obj['MmeCode']+' '+d_obj['id']+' '+
 d_obj['MmeUeS1apId']+' '+ d_obj['MmeGroupId']+' '+str(elem.text)+'
')
 vs_cnt += 1
 elem.clear()
 str_s = file_io.getvalue().replace(' 
','
').replace(' ',',').replace('T',' ').replace('NIL','') #写入解析后内容
 xm.close()
 file_io.close()
 return (str_s,vs_cnt)