班級不可召集

Question

我是Python的新手，正在嘗試連接到Poloniex API。

他們提供了這個包裝器，很棒。

import urllib
import urllib2
import json
import time
import hmac,hashlib

def createTimeStamp(datestr, format="%Y-%m-%d %H:%M:%S"):
    return time.mktime(time.strptime(datestr, format))

class poloniex:
    def __init__(self, APIKey, Secret):
        self.APIKey = APIKey
        self.Secret = Secret

    def post_process(self, before):
        after = before

        # Add timestamps if there isnt one but is a datetime
        if('return' in after):
            if(isinstance(after['return'], list)):
                for x in xrange(0, len(after['return'])):
                    if(isinstance(after['return'][x], dict)):
                        if('datetime' in after['return'][x] and 'timestamp' not in after['return'][x]):
                            after['return'][x]['timestamp'] = float(createTimeStamp(after['return'][x]['datetime']))

        return after

    def api_query(self, command, req={}):

        if(command == "returnTicker" or command == "return24Volume"):
            ret = urllib2.urlopen(urllib2.Request('https://poloniex.com/public?command=' + command))
            return json.loads(ret.read())
        elif(command == "returnOrderBook"):
            ret = urllib2.urlopen(urllib2.Request('https://poloniex.com/public?command=' + command + '&currencyPair=' + str(req['currencyPair'])))
            return json.loads(ret.read())
        elif(command == "returnMarketTradeHistory"):
            ret = urllib2.urlopen(urllib2.Request('https://poloniex.com/public?command=' + "returnTradeHistory" + '&currencyPair=' + str(req['currencyPair'])))
            return json.loads(ret.read())
        else:
            req['command'] = command
            req['nonce'] = int(time.time()*1000)
            post_data = urllib.urlencode(req)

            sign = hmac.new(self.Secret, post_data, hashlib.sha512).hexdigest()
            headers = {
                'Sign': sign,
                'Key': self.APIKey
            }

            ret = urllib2.urlopen(urllib2.Request('https://poloniex.com/tradingApi', post_data, headers))
            jsonRet = json.loads(ret.read())
            return self.post_process(jsonRet)


    def returnTicker(self):
        return self.api_query("returnTicker")

    def return24Volume(self):
        return self.api_query("return24Volume")

    def returnOrderBook (self, currencyPair):
        return self.api_query("returnOrderBook", {'currencyPair': currencyPair})

    def returnMarketTradeHistory (self, currencyPair):
        return self.api_query("returnMarketTradeHistory", {'currencyPair': currencyPair})


    # Returns all of your balances.
    # Outputs:
    # {"BTC":"0.59098578","LTC":"3.31117268", ... }
    def returnBalances(self):
        return self.api_query('returnBalances')

    # Returns your open orders for a given market, specified by the "currencyPair" POST parameter, e.g. "BTC_XCP"
    # Inputs:
    # currencyPair  The currency pair e.g. "BTC_XCP"
    # Outputs:
    # orderNumber   The order number
    # type          sell or buy
    # rate          Price the order is selling or buying at
    # Amount        Quantity of order
    # total         Total value of order (price * quantity)
    def returnOpenOrders(self,currencyPair):
        return self.api_query('returnOpenOrders',{"currencyPair":currencyPair})


    # Returns your trade history for a given market, specified by the "currencyPair" POST parameter
    # Inputs:
    # currencyPair  The currency pair e.g. "BTC_XCP"
    # Outputs:
    # date          Date in the form: "2014-02-19 03:44:59"
    # rate          Price the order is selling or buying at
    # amount        Quantity of order
    # total         Total value of order (price * quantity)
    # type          sell or buy
    def returnTradeHistory(self,currencyPair):
        return self.api_query('returnTradeHistory',{"currencyPair":currencyPair})

    # Places a buy order in a given market. Required POST parameters are "currencyPair", "rate", and "amount". If successful, the method will return the order number.
    # Inputs:
    # currencyPair  The curreny pair
    # rate          price the order is buying at
    # amount        Amount of coins to buy
    # Outputs:
    # orderNumber   The order number
    def buy(self,currencyPair,rate,amount):
        return self.api_query('buy',{"currencyPair":currencyPair,"rate":rate,"amount":amount})

    # Places a sell order in a given market. Required POST parameters are "currencyPair", "rate", and "amount". If successful, the method will return the order number.
    # Inputs:
    # currencyPair  The curreny pair
    # rate          price the order is selling at
    # amount        Amount of coins to sell
    # Outputs:
    # orderNumber   The order number
    def sell(self,currencyPair,rate,amount):
        return self.api_query('sell',{"currencyPair":currencyPair,"rate":rate,"amount":amount})

    # Cancels an order you have placed in a given market. Required POST parameters are "currencyPair" and "orderNumber".
    # Inputs:
    # currencyPair  The curreny pair
    # orderNumber   The order number to cancel
    # Outputs:
    # succes        1 or 0
    def cancel(self,currencyPair,orderNumber):
        return self.api_query('cancelOrder',{"currencyPair":currencyPair,"orderNumber":orderNumber})

在一個單獨的文件中，我有這個：

import poloniex

myapi = poloniex("My APIKey is here","My Secret is here")
balance = myapi.returnBalances()
print balance

它返回“ TypeError：'模塊'對象不可調用”以及“ E1102：poloniex不可調用”。

我究竟做錯了什么？ 同樣，我是python和編碼的新手，所以我可能在做一些愚蠢的事情:)

Answer 1

這表明import poloniex實際上並未在當前名稱空間中放置具有該名稱的類。 請查閱他們的文檔以了解如何精確import ，但是在這種情況下，解決方案通常類似於from poloniex import poloniex 。

正交地，您可以保持import不變，而是將代碼更改為使用poloniex.poloniex()而不是poloniex() 。

如果不清楚，我們說的是“從文件名導入類 名 ”，而不是“導入文件名 ”； 錯誤消息基本上說“ 文件名是文件名，而不是類名”。

定義明確的模塊具有__init.py__ ，它可以為您處理這些事情。 有時，作者寫了文檔，但后來卻忘記了按照他們計划的方式在__init__.py實際設置這些東西。 如果他們僅在其源代碼樹中運行測試，則它們沒有在測試此功能方面。