ipad的goodreader对js文件支持不太好，虽然可以读取它但总是无法退出，回不了goodreader的主界面，因此我需要把js文件批量变成纯文本。基于这个目的，我搞了下面一个小应用:
代码如下:
# -*- coding:utf-8 -*-
import os
def rename():
    path = raw_input(请输入要处理的文件夹路径)
    print path
    old_ext = .+raw_input(请输入要处理的文件类型)
    print old_ext
    new_ext = .+raw_input(请输入你想变成的文件类型)
    print new_ext
    for (path, dirs, files) in os.walk(path):#遍历目录树
        for filename in files:
            ext = os.path.splitext(filename)[1] #取得文件类型，注意它还带着点号
            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()