python小工具：批量替换某个目录下的文件名

# encoding:utf-8
import sys, os, re;

if len(sys.argv)!=4:
    print 'Uage: '+sys.argv[0]+ ' dir oldstr newstr';
    sys.exit();

dir = sys.argv[1];
oldstr = sys.argv[2];
newstr = sys.argv[3];

for name in os.listdir(dir):
    if oldstr in name:
        newname = name.replace(oldstr, newstr);
        print(dir+'/'+name.decode('utf-8'), '->', dir+'/'+newname.decode('utf-8'));
        os.rename(dir+'/'+name, dir+'/'+newname);