Run sample program met 403 error. about trading-bot HOT 11 OPEN

#!/usr/bin/python
# -*- coding:utf-8 -*-

import urllib
import urllib2
import json
import time
import hmac
import 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})

    # Immediately places a withdrawal for a given currency, with no email confirmation. In order to use this method, the withdrawal privilege must be enabled for your API key. Required POST parameters are "currency", "amount", and "address". Sample output: {"response":"Withdrew 2398 NXT."}
    # Inputs:
    # currency      The currency to withdraw
    # amount        The amount of this coin to withdraw
    # address       The withdrawal address
    # Outputs:
    # response      Text containing message about the withdrawal
    def withdraw(self, currency, amount, address):
        return self.api_query('withdraw', {"currency": currency, "amount": amount, "address": address})

import time
import sys, getopt
import datetime
from poloniex import poloniex

def main(argv):
    period = 10
    pair = "BTC_XML"
    prices = []
    currentMovingAverage = 0;
    lengthOfMA = 0
    startTime = False
    endTime = False
    historicalData = False
    tradePlaced = False
    typeOfTrade = False
    dataDate = ""
    orderNumber = ""

    try:
        opts, args = getopt.getopt(argv,"hp:c:n:s:e:",["period=","currency=","points="])
    except getopt.GetoptError:
        print 'trading-bot.py -p <period length> -c <currency pair> -n <period of moving average>'
        sys.exit(2)

    for opt, arg in opts:
        if opt == '-h':
            print 'trading-bot.py -p <period length> -c <currency pair> -n <period of moving average>'
            sys.exit()
        elif opt in ("-p", "--period"):
            if (int(arg) in [300,900,1800,7200,14400,86400]):
                period = arg
            else:
                print 'Poloniex requires periods in 300,900,1800,7200,14400, or 86400 second increments'
                sys.exit(2)
        elif opt in ("-c", "--currency"):
            pair = arg
        elif opt in ("-n", "--points"):
            lengthOfMA = int(arg)
        elif opt in ("-s"):
            startTime = arg
        elif opt in ("-e"):
            endTime = arg



    conn = poloniex('MyKey','MySecret')

    if (startTime):
        historicalData = conn.api_query("returnChartData",{"currencyPair":pair,"start":startTime,"end":endTime,"period":period})

    while True:
        if (startTime and historicalData):
            nextDataPoint = historicalData.pop(0)
            lastPairPrice = nextDataPoint['weightedAverage']
            dataDate = datetime.datetime.fromtimestamp(int(nextDataPoint['date'])).strftime('%Y-%m-%d %H:%M:%S')
        elif(startTime and not historicalData):
            exit()
        else:
            currentValues = conn.api_query("returnTicker")
            lastPairPrice = currentValues[pair]["last"]
            dataDate = datetime.datetime.now()

        if (len(prices) > 0):
            currentMovingAverage = sum(prices) / float(len(prices))
            previousPrice = prices[-1]
            if (not tradePlaced):
                if ( (lastPairPrice > currentMovingAverage) and (lastPairPrice < previousPrice) ):
                    print "SELL ORDER"
                    orderNumber = conn.sell(pair,lastPairPrice,.01)
                    tradePlaced = True
                    typeOfTrade = "short"
                elif ( (lastPairPrice < currentMovingAverage) and (lastPairPrice > previousPrice) ):
                    print "BUY ORDER"
                    orderNumber = conn.buy(pair,lastPairPrice,.01)
                    tradePlaced = True
                    typeOfTrade = "long"
            elif (typeOfTrade == "short"):
                if ( lastPairPrice < currentMovingAverage ):
                    print "EXIT TRADE"
                    conn.cancel(pair,orderNumber)
                    tradePlaced = False
                    typeOfTrade = False
            elif (typeOfTrade == "long"):
                if ( lastPairPrice > currentMovingAverage ):
                    print "EXIT TRADE"
                    conn.cancel(pair,orderNumber)
                    tradePlaced = False
                    typeOfTrade = False
        else:
            previousPrice = 0

        print "%s Period: %ss %s: %s Moving Average: %s" % (dataDate,period,pair,lastPairPrice,currentMovingAverage)

        prices.append(float(lastPairPrice))
        prices = prices[-lengthOfMA:]
        if (not startTime):
            time.sleep(int(period))


if __name__ == "__main__":
    main(sys.argv[1:])