import urllib.request
import os ,stat
url = "https://cn.bing.com/th"
try:
  urllib.request.urlretrieve(url,filename="/home/baixiaoxu/desk/123.jpg")
except IOError as e:
  print("IOE ERROR")
except Exception as e:
  print("Exception")

注意：
1，获取地址，判断地址是否存在
2，本地保存地址，判断存在
3，获取远程地址的图片名，或改名
"""
url = "https://cn.bing.com/th"
file_suffix = os.path.split(url)[1][-20:-1]
print(file_suffix)
"""

import urllib.request
import os ,stat

req = urllib.request.Request(url)
file = "/home/baixiaoxu/desk/file-ttttt.jpg"
req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.3; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0')
response = urllib.request.urlopen(url)
html = response.read()
with open(file, 'wb') as f:
   f.write(html)

import os
os.makedirs('./image/', exist_ok=True)
IMAGE_URL = "http://image.nationalgeographic.com.cn/2017/1122/20171122113404332.jpg"
 
def urllib_download():
  from urllib.request import urlretrieve
  urlretrieve(IMAGE_URL, './image/img1.png')   
 
def request_download():
  import requests
  r = requests.get(IMAGE_URL)
  with open('./image/img2.png', 'wb') as f:
    f.write(r.content)           
 
def chunk_download():
  import requests
  r = requests.get(IMAGE_URL, stream=True)  
  with open('./image/img3.png', 'wb') as f:
    for chunk in r.iter_content(chunk_size=32):
      f.write(chunk)

import urllib
from  urllib import request
import re

response = request.urlopen('https://cn.bing.com/')
html = response.read()
ht = html.decode()
pattern = r'bgLink(.*"/home/baixiaoxu/desk/download.jpg")