code: def list_markets_by_currency(self, currency):
          
          return [market['MarketName'] for market in self.get_markets()['result']
                  if market['MarketName'].lower().endswith(currency.lower())]
docs: Helper function to see which markets exist for a currency.
  
          Endpoint: /public/getmarkets
  
          Example ::
              >>> Bittrex(None, None).list_markets_by_currency('LTC')
              ['BTC-LTC', 'ETH-LTC', 'USDT-LTC']
  
          :param currency: String literal for the currency (ex: LTC)
          :type currency: str
          :return: List of markets that the currency appears in
          :rtype: list