CHBTC中比特交易所SDK-Python版

#!/usr/bin/python
# -*- coding: utf-8 -*-
#用于访问CHBTC现货REST API

import time,datetime
import hashlib,hmac
import urllib.request,urllib.parse
import json
import numpy as np


class ChBtc:

    def __init__(self, accesskey, secretkey):
        self.__url = "http://api.chbtc.com/data/v1/"
        self.__accesskey = accesskey
        self.__secretkey = secretkey

    # 行情
    def ticker(self, currency = 'btc_cny'):
        url = self.__url + 'ticker?currency=%s'%(currency)
        return self.http_request(url)

    # 市场深度
    def depth(self, currency = 'btc_cny', size = '3', merge = '0.1'):
        url = self.__url + 'depth?currency=%s&size=%s&merge=%s'%(currency, size, merge)
        return self.http_request(url)

    # 历史成交
    def trades(self, currency = 'btc_cny'):
        url = self.__url + 'trades?currenc