def tradingpairs(self, pairs):
        '''
        Use this function to query price and volume data for MANY trading pairs.
        Usage: http://api.cryptocoincharts.info/tradingPairs/[currency1_currency2,currency2_currency3,...]
               A example pair: currency1_currency2 = "doge_btc"
                               currency2_currency3 = "btc_eur"
               http://api.cryptocoincharts.info/tradingPairs/"doge_btc,btc_eur"            
        '''
        url = self.API_PATH + 'tradingPairs/'
        data = { 'pairs':pairs }
        
        json_data = json.loads(self._getdata(url, data))
        
        tradingpairs = []
        for entry in json_data:
            tradingpair = TradingPair()
            tradingpair.id = entry['id']
            tradingpair.price = entry['price']
            tradingpair.price_before_24h = entry['price_before_24h']
            tradingpair.volume_first = entry['volume_first']
            tradingpair.volume_second = entry['volume_second']
            tradingpair.volume_btc = entry['volume_btc']
            tradingpair.best_market = entry['best_market']
            tradingpair.latest_trade = entry['latest_trade']
            tradingpairs.append(tradingpair)
        
        return tradingpairs
Use this function to query price and volume data for MANY trading pairs.
        Usage: http://api.cryptocoincharts.info/tradingPairs/[currency1_currency2,currency2_currency3,...]
               A example pair: currency1_currency2 = "doge_btc"
                               currency2_currency3 = "btc_eur"
               http://api.cryptocoincharts.info/tradingPairs/"doge_btc,btc_eur"