#coding=utf-8
import os, time, sys, re
 #reload(sys)
 #sys.setdefaultencoding("utf8")  # 不設置，否則編碼方式不對應，無法找出字符串
file = open(path)
sum=0
 for line in file.readlines():
  #line = line.strip("\n")
   key = "解析渲染" 
   if key in line:
     s = re.findall('"TimeSpan":"([\d.]+)"', line)
     print "**************", line
     print "時間為：", s[-1]
     sum = sum + float(s[-1])
 file.close()
print "總時間為：", sum
input("123")
          

            
>>> f = open(r'E:\python\somefile.txt','w')        打開文件，寫模式
>>> f.write('this\nis no \nhailu')             寫入三行話
17
>>> f.close()
>>> f = open(r'E:\python\somefile.txt','r')
>>> f.read()
'this\nis no \nhailu'                    查看一下
>>> f = open(r'E:\python\somefile.txt')
>>> lines = f.readlines()                  把每一行的內容變為集合lines 的一個元素
>>> f.close()
>>> lines[1] = "isn't a\n"                 給lines的第二個元素 重新賦值（改寫了）
>>> f = open(r'E:\python\somefile.txt','w')
>>> f.writelines(lines)
>>> f.close()                         
>>   
改寫后的文件打開就是這個樣子

            
              this
isn't a
hailu