def get(self, currency, refresh_rates=True):
        if refresh_rates:
            self.loadPrices()
        self.condition.acquire()
        try:
            last = self.prices[currency]
        except Exception:
            last = 0
        finally:
            self.condition.release()
        return last
:param currency: an upper case 3 letter currency code
dataset/ETHPy150Open OpenBazaar/OpenBazaar-Server/market/btcprice.py/BtcPrice.get