# -*- coding: utf-8 -*-
import requests
def download_image():
  """
  demo:下载图片
  :return:
  """
  headers = {"User-Agent":"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36"}
  url = "https://timgsa.baidu.com/timg"
  response = requests.get(url, headers=headers, stream=True)
  #print str(response.text).decode('ascii').encode('gbk')
  with open('demo.jpg', 'wb') as fd:
    for chunk in response.iter_content(128):
      fd.write(chunk)
download_image()
def download_image_improved():
  """demo: 下载图片"""
  #伪造headers信息
  headers = {
    "User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36"}
  #限定URL
  url = "https://timgsa.baidu.com/timg"
  response = requests.get(url, headers=headers, stream=True)
  from contextlib import closing
  #用完流自动关掉
  with closing(requests.get(url, headers=headers, stream=True)) as response:
    #打开文件
    with open('demo1.jpg', 'wb') as fd:
      #每128写入一次
      for chunk in response.iter_content(128):
        fd.write(chunk)
download_image_improved()