python按行读取文件并找出其中指定字符串

#coding=utf-8import os, time, sys, re #reload(sys) #sys.setdefaultencoding("utf8")  # 不设置，否则编码方式不对应，无法找出字符串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 "时间为：", s[-1]     sum = sum + float(s[-1]) file.close()print "总时间为：", suminput("123")

>>> f = open(r'E:/python/somefile.txt','w')        打开文件，写模式>>> f.write('this/nis no /nhailu')             写入三行话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()                  把每一行的内容变为集合lines 的一个元素>>> f.close()>>> lines[1] = "isn't a/n"                 给lines的第二个元素 重新赋值（改写了）>>> f = open(r'E:/python/somefile.txt','w')>>> f.writelines(lines)>>> f.close()                         >>   改写后的文件打开就是这个样子<pre name="code" class="python">thisisn't ahailu