python-3.x - Python Poloniex API 调用

Question

我有以下代码，我试图根据 their instructions 对 Poloniex 进行 API 调用

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


Key = "whatever your key is"
Sign = "whatever your secret is"

def returnBalances(balances):
    nonce = int(round(time.time()-599900000)*10)
    parms = {"returnBalances":balances,
             "nonce":nonce}

    parms = urllib.parse.urlencode(parms)
    hashed = hmac.new(b'Sign',digestmod=hashlib.sha512)
    signature = hashed.hexdigest()

    headers = {"Content-type":"application/x-www-form-urlencoded",
               "Key":Key,
               "Sign":signature}

    conn = urllib.request.urlopen("https://poloniex.com")
    conn.request("POST","/tradingApi",parms,headers)

    response = conn.getresponse()
    print(response.status,response.reason)

returnBalances('balances')

当我运行这个时，我收到此错误消息

HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 403: Forbidden

有人可以帮忙吗？

Answer 1

• 您可以使用 urllib.error.HTTPError 捕获 HTTP 错误
• POST 数据应该是字节，因此您必须编码 parms
• urllib.request.urlopen返回 HTTPResponse对象，没有 request方法。
  如果你想设置标题和其他参数，你应该使用 urllib.request.Request
• 根据api docs post 参数应该是“nonce”和“command”，所以我修改了您的函数以接受“returnBalances”作为参数并在 parms["command"] 中使用它

---

def api_call(command):
    nonce = int(round(time.time()-599900000)*10)
    parms = {"command":command, "nonce":nonce}
    parms = urllib.parse.urlencode(parms).encode()

    hashed = hmac.new(Sign.encode(), parms, digestmod=hashlib.sha512)
    signature = hashed.hexdigest()
    headers = {"Key":Key, "Sign":signature}

    req = urllib.request.Request("https://poloniex.com/tradingApi", headers=headers)
    try:
        conn = urllib.request.urlopen(req, data=parms)
    except urllib.error.HTTPError as e:
        conn = e
    print(conn.status,conn.reason)
    return json.loads(conn.read().decode())

balances = api_call("returnBalances")