Python批量修改文本文件内容

Python批量替换文件内容，支持嵌套文件夹

 import os
 path="./"
 for root,dirs,files in os.walk(path):
     for name in files:
         #print name
         if name.endswith(".html"):
             #print root,dirs,name
             filename=root+"/"+name
             f=open(filename,"r")
             filecontent=""
             line=f.readline()
             while line:
                 l=line.replace(":8081/arcgis_js_api","/arcgisapi")
                 filecontent=filecontent+l
                 line=f.readline()
             f.close()
             f2=file(filename,"w")
             f2.writelines(filecontent)
             f2.close()