Python 3.6.1:即使用urllib.parse.urlencode()编码也会出错

时间:2017-04-18 15:24:19

标签: python python-3.x

我是Python新手并使用版本3.6.1

我希望我可以使用HMAC-SHA512为poloniex trading api编写Python 3.6.1 Post请求的代码但是出现了这个错误。

我得到的答案大多来自python 2,这不是我想要的。请帮忙。

这是poloniex文档:https://poloniex.com/support/api/

我的python shell首先登录:

{'command': 'returnBalances', 'nonce': 1492523610}
command=returnBalances&nonce=1492523610
Traceback (most recent call last):
  File "C:/Users/draft/Desktop/test3.py", line 21, in <module>
    signing = hmac.new(secret, post_data, hashlib.sha512).hexdigest()
  File "C:\Users\draft\AppData\Local\Programs\Python\Python36-32\lib\hmac.py", line 144, in new
    return HMAC(key, msg, digestmod)
  File "C:\Users\draft\AppData\Local\Programs\Python\Python36-32\lib\hmac.py", line 84, in __init__
    self.update(msg)
  File "C:\Users\draft\AppData\Local\Programs\Python\Python36-32\lib\hmac.py", line 93, in update
    self.inner.update(msg)
TypeError: Unicode-objects must be encoded before hashing

接下来是我的完整代码:

import urllib.request
import urllib.parse
import hmac
import hashlib
import time
import json

t = int(time.time())
secret = b'<secret>'
headers = { 'Key' : '<api key>',
            'Sign': ''}
url = 'https://poloniex.com/tradingApi'
req={}

req['command'] = 'returnBalances'
req['nonce'] = int(time.time())
#print (req)

post_data =  urllib.parse.urlencode(req)
#print (post_data)
signing = hmac.new(secret, post_data, hashlib.sha512).hexdigest()
#print (signing)
headers['Sign'] = signing

ret = urllib.request.Request(url, data, headers)
#print (ret)


ret = urllib.request.urlopen(ret)
a = json.loads(ret.read())
#print (a)

希望任何人都能引导我走向正确的方向。非常感谢。

1 个答案:

答案 0 :(得分:0)

我认为你只需要替换:

  

post_data = urllib.parse.urlencode(req)

通过

  

post_data = str.encode(urllib.parse.urlencode(req))