python解析基于xml格式的日志文件

#coding:utf-8 
import re 
#文本所在TXT文件 
file = 'iag_interface.log' 
#分割一段 
xml1='catalina-exec' 
xml2='catalina-exec' 
#关键字reqtimestamp 
time1 = '<timestamp>' 
time2 = '</timestamp>' 
#关键字functionid 
functionid1 = '<functionid>' 
functionid2 = '</functionid>' 
#关键字transid 
transid1='<transid>' 
transid2='</transid>' 
#关键字siappid 
siappid1='<siappid>' 
siappid2='</siappid>' 
#关键字userid 
userid1='<userid>' 
userid2='</userid>' 
#关键字mobnum 
mobnum1='<mobnum>' 
mobnum2='</mobnum>' 
f = open(file,'r',encoding= 'utf-8') 
#f = open(file,'r') 
#for (num,value) in enumerate(f): 
 #print("line number",num,"is:",value) 
buff = f.read() 
#清除换行符,请取消下一行注释 
#buff = buff.replace('\n','') 
pat = re.compile(time1+'(.*?)'+time2,re.S) 
pat1 = re.compile(functionid1+'(.*?)'+functionid2,re.S) 
pat2 = re.compile(transid1+'(.*?)'+transid2,re.S) 
pat3 = re.compile(siappid1+'(.*?)'+siappid2,re.S) 
pat4 = re.compile(userid1+'(.*?)'+userid2,re.S) 
pat5 = re.compile(mobnum1+'(.*?)'+mobnum2,re.S) 
pat6=re.compile(xml1+'(.*?)'+xml2,re.S) 
result6 = pat6.findall(buff) 
print(len(result6)) 
x = open("logfx.txt", 'w') 
x.write("===========================开始数据================================="+"\n") 
x.write("time"+"\t"+"functionid"+"\t"+"transid"+"\t"+"siappid"+"\t"+"userid"+"\t"+"mobnum"+"\n") 
for i in range(0,len(result6)): 
 result = pat.findall(result6[i]) 
 result1 = pat1.findall(result6[i]) 
 result2 = pat2.findall(result6[i]) 
 result3 = pat3.findall(result6[i]) 
 result4 = pat4.findall(result6[i]) 
 result5 = pat5.findall(result6[i]) 
 if len(result)==0: 
  result.append("空") 
 if len(result1)==0: 
  result1.append("空") 
 if len(result2)==0: 
  result2.append("空") 
 if len(result3)==0: 
  result3.append("空") 
 if len(result4)==0: 
  result4.append("空") 
 if len(result5)==0: 
  result5.append("空") 
 #print(result[0],"=",result1[0],"=",result2[0],"=",result3[0],"=",result4[0],"=",result5[0]) 
 x.write("timestamp:"+result[0]+"\t"+result1[0]+"\t"+result2[0]+"\t"+result3[0]+"\t"+result4[0]+"\t"+"mobnum:"+result5[0]+"\n") 
x.write("===========================结束数据================================="+"\n")  
print("执行完毕!生成文件logfx.txt") 
x.close()