python 求两个时间差

    def timeInterval(self):
        today = datetime.date.today()
        print today
        modifiedTime =  os.stat(filename).st_mtime//该文件的修改时间
        modifiedTime =  datetime.date.fromtimestamp(modifiedTime) //在这里转换年-月-日 格式
        print modifiedTime
   
　　     dayCount = (today - modifiedTime).days
　　　　　print dayCount
        

或者最简单的：

start = time.time()
time_interval = time.time() - start