Python遍历文件夹下指定后缀的所有文件

import os
def searchWithSuffixxes(dir,suffixes,slist=[]):
    for lists in os.listdir(dir):
        path = os.path.join(dir,lists)
        if os.path.isfile(path):
            if path.endswith(suffixes):
                dirc,fileNm = os.path.split(path)
                slist.append(dirc+"\"+fileNm)
        if os.path.isdir(path):
            searchWithSuffixxes(path,suffixes,slist)
        return slist