python requests库模拟浏览器下载图片

#coding=utf-8

 import requests

 #??????

 def download():

     

     headers={"User-Agent":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36"}

     url="http://images.haiwainet.cn/2016/1120/20161120112109721.jpg"

     response=requests.get(url,headers=headers)

     with open("demo.jpg","wb") as f:

         for chunk in response.iter_content(128):

             f.write(chunk)

     

 def download2():

     #??headers??

     headers={"User-Agent":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36"}

     #??url

     url="http://images.haiwainet.cn/2016/1120/20161120112109721.jpg"

     from contextlib import closing

     with closing(requests.get(url,headers=headers,stream=True)) as response:

         #????

         with open("demo2.jpg","wb") as fd:

             #?128????

             for chunck in response.iter_content(128):

                 fd.write(chunck)

                 

     

 download2()

步骤：

1.浏览器模拟

2.指定url

3.去读流的数据

4.存入数据

import urllib
 import urllib2
 import requests
 print "demo1"
 URL="https://api.github.com"
 def ull():
     response=urllib2.urlopen(URL)
     print "Response >>>>"
     print response.info()#?????????
 def user_paramter():
     #??????
     parmes=urllib.urlencode({"wd":"pyhon"})
     print "Parmters >>"
     request=urllib2.Request("?".join([URL,parmes]))
     request.add_header("User-Agent","Mozilla/5.0")
     #????????
     response=urllib2.urlopen(request)
    
     #????
     print "Response >>>>"
     #?????????
 def build_url(url):
     return "/".join([URL,url])
 def user_request():
 #     parmertes={"wd":"python"}
     response=requests.get(build_url("user/emails"),auth=("imoocdemo","imoocdemo123"))
     print "Headers>>"
     print response.text
     print "Response Body"
     
 def params_request():
     response=requests.get(build_url("users"),params={"since":11})
     print response.text
     print response.url
     print response.request.headers
 def patch_request():
     #response=requests.patch(build_url("user"),auth=("imoocdemo","imoocdemo123"),json={"name":"babymooc3","email":"hello-world@imooc.org"})
     response=requests.post(build_url("user"),auth=("imoocdemo","imoocdemo123"),json=["Good@163.com"])
     print response.headers
     print response.request.body
     print response.status_code
     
 patch_request()