Python bulk change file suffix sample code sharing

The ipad's goodreader doesn't support JS files very well, and although it can be read, it's always impossible to exit and return to the main interface of goodreader, so I need to batch JS files into plain text. For this purpose, I created the following app:

# -*- coding:utf-8 -*-

import os
def rename():
    path = raw_input(" Please enter the folder path to be processed ")
    print path
    old_ext = "."+raw_input(" Please enter the type of file you want to process ")
    print old_ext
    new_ext = "."+raw_input(" Please enter the type of file you want to be ")
    print new_ext
    for (path, dirs, files) in os.walk(path):# Traverse the directory tree 
        for filename in files:
            ext = os.path.splitext(filename)[1] # Gets the file type, notice that it also has a dot 
            print ext;
            if(ext == old_ext):
                print "----------------"
                newname = filename.replace(old_ext, new_ext)
                oldpath = path + "\" + filename
                newpath = path + "\" + newname 
                try:
                    os.rename(oldpath, newpath)
                except BaseException, e:
                   print(str(e))

if __name__ == '__main__':
    rename()