问Python请求:下载的图像文件二进制与原始文件不相同吗？

EN

import requests
import shutil
import os

if __name__ == "__main__":

image_url = 'http://www.123.com/image.jpg'
filename = 'out.jpg'
username = 'myusername'
password = 'mypasword'
path = os.path.join('c:/', filename )

r = requests.get(image_url, auth=(username, password), stream=True)
if r.status_code == 200:
    with open(path, 'w') as f:
        r.raw.decode_content = False
        shutil.copyfileobj(r.raw, f)

print 'The End'