python遍历文件夹获取指定格式的文件

1、源码如下：

import osimport os.pathimport sysimport globdef getalltxtfilename2(path):     txtfilenames=[]     for dirpath,dirnames,filenames in os.walk(path):         filenames=filter(lambda filename:filename[-4:]=='.mp3',filenames)         filenames=map(lambda filename:os.path.join(dirpath,filename),filenames)         txtfilenames.extend(filenames)        #print filenames    return txtfilenames      if __name__ == "__main__" : try :    filenames=getalltxtfilename2("E:\cocos2d-x-2.2.2\projects\Constellation\Resources\Sound")    for filename in filenames:        print filename except :  print "execute list_file_dir fun error"