update doutu.py.

doutu.py

@@ -13,6 +13,7 @@ email : newrain_wang@163.com                  *
 import requests
 from lxml import etree
 import time
+import os
 
 def getUrl():
     header = {
@@ -26,6 +27,8 @@ def getUrl():
         for i in url:
             name = i.split("/")[-1]
             result = requests.get(i)
+            if not os.path.exists('./image'):
+                os.mkdir('image')
             with open(f'image/{name}', 'wb') as f:
                 f.write(result.content)
             print(name,'已完成')