如何在python里获取导入图片的大小？

import os

from PIL import Image

path = os.path.join(os.getcwd(),"23.png")

img = Image.open(path)

print img.format        # PNG

print img.size          # (3500, 3500)

#! -*- coding: utf-8 -*-

import requests

import io

url = "http://s1.sinaimg.cn/large/001Db1PVzy7qxVQWMjs06"

image = requests.get(url).content

image_b = io.BytesIO(image).read()

size = len(image_b)

print("{} byte\n{} kb\n{} Mb".format(size, size / 1e3, size / 1e6))