python3----练习题(....)

 1 def save_file():
 2     url = ‘http://css.8684.cn/citys/images/line/45.jpg‘
 3     root = r‘d:/pics/‘
 4     path = root + url.split(‘/‘)[-1]
 5     try:
 6         if not os.path.exists(root):
 7             os.mkdir(root)
 8         if not os.path.exists(path):
 9             r = requests.get(url)
10             with open(path, ‘wb‘) as f:
11                 f.write(r.content)
12                 f.close()
13                 print("文件保存成功")
14         else:
15             print("文件已存在")
16     except:
17         print("爬取失败")