[root@localhost python]# cat modify_db.py#!/usr/bin/pythonimport osdir ='/data/script/shell/bak3303_201308011221'dir2='/data/script/python/out_db/'files=os.listdir(dir)for f in files:    print f    file1=os.path.join(dir,f)    file_object=open(file1,'r')    all_the_txt=file_object.read()    file2=all_the_txt.replace('DEFINER=`root`@`%`','')    file_object2=os.path.join(dir2,f)    file_object3=open(file_object2,'w')    file_object3.write(file2)    file_object.close()    file_object3.close()

遍历dir文件夹下的内容，进行DEFINER=`root`@`%`替换成空格，最后按原文件名保存到dir2文件夹下。