python linecache 处理固定格式文本数据的方法

#!/usr/bin/env python
# -*- coding: utf-8 -*-
''''提取result结果分值'''
 
import linecache
import os
import os.path
 
rootdir = r"./815old/"
 
for parent, dirnames, filenames in os.walk(rootdir): # 三个参数：分别返回1.父目录 2.所有文件夹名字（不含路径） 3.所有文件名字
  for filename in filenames: # 输出文件信息
    files = os.path.join(parent, filename) # 输出文件路径信息
    count = len(open(files, 'r').readlines()) # 行数
    str = linecache.getlines(files) # 所有文件的字符串
    filename = str[2] #第三行
    if count > 6: # 行数大于5行表示命中
      matchRatio = str[8] #第九行
      print filename[58:-2], " ", matchRatio[15:], "\r"
    else: # 没有命中 matchRatio 赋值0
      print filename[58:-2], " ", '0', "\r"

results {
 fileID: "386e86d2e3991de32a028b7e26e58ffd"
 filename: "/opt/vfpgen/video_file/192.168.142.199/video/Avatar.2009.iTALiAN.READNFO.LD.TS.XviD-SiLENT.CD1[S.o.M.].avi"
 filetype: 1
 vfpQueryResults {
  fileID: "09b509f6c625aeb525f6f1c8e09725d6"
  filename: "/opt/SmartVision/system/copyrightfpdb//dbfp/09b509f6c625aeb525f6f1c8e09725d6.DB.cdvs"
  matchScore: 0.85874754
  matchRatio: 0.53333336
  dbID: "copyright_library_db"
  startframe: 16210
  endframe: 97240
 }
}