python3获取文件夹大小

# 单位byte   
def getdirsize(self,args):
        dir = args.dir
        size = 0
        for root, dirs, files in os.walk(dir):
            size += sum([getsize(join(root, name)) for name in files])

        return size

 性能还挺高，获取10G文件夹大小只需20s左右，我机器是1g单核