爬虫04（网络图片的爬取与存储）.py

import requests
import os
url = "http://image.nationalgeographic.com.cn/2017/0211/20170211061910157.jpg"
root = "E://Codes/Python/网络爬虫·初级/images/"
path = root + url.split('/')[-1]
try :
    if not os.path.exists(root) :
        os.mkdir(root)
    if not os.path.exists(path) :
        r = requests.get(url)
        with open(path,'wb') as f :
            f.write(r.content)
            f.close()
            print("文件保存成功")
    else :
        print("文件已存在")
except :
    print("爬取失败")