pyhton的post表单提交不正确

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1. import re
   
2. import requests as req
   
3. url = r'UC不让发网址，见下面'
   
4. UA = {'User-Agent':'Mozilla/5.0'}
   
5. formdata = {
   
6.     '__EVENTTARGET':"",
   
7.     '__EVENTARGUMENT':"",
   
8.     '__VIEWSTATE':'',
   
9.     'ddlcounty':"市级",
   
10.     'ddlPZYear': '2014',
    
11.     'txtAppName': "",
    
12.     'AspNetPager_input': '30',
    
13.     'AspNetPager': '跳转'
    
14. }
    
15. ssn = req.Session()
    
16. ssn.headers = UA
    
17. rsp = ssn.get(url)
    
18. html = rsp.text
    
19. vs = re.findall(r'<input[^>]+?name="__VIEWSTATE"[^>]+?value="([^"]+)',html)[0]
    
20. formdata['__VIEWSTATE'] = vs
    
21. rsp = ssn.post(url, data=formdata)
    
22. html = rsp.text
    
23. pg = ''.join(re.findall(r'(当前页：).+?(\d+)',html, re.S)[0])
    
24. print(pg)

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网址在附件里，麻烦了