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+from .alphavantage import AlphaVantage as av%0A%0A%0Aclass CryptoCurrencies(av):%0A    %22%22%22This class implements all the crypto currencies api calls%0A    %22%22%22%0A%0A    @av._call_api_on_func%0A    def get_currency_Exchange_rate(self, from_currency, to_currency):%0A        %22%22%22 Returns the realtime exchange rate for any pair of digital%0A        currency (e.g., Bitcoin) or physical currency (e.g., USD).%0A%0A        Keyword Arguments:%0A            from_currency: The currency you would like to get the exchange rate%0A            for. It can either be a physical currency or digital/crypto currency.%0A            For example: from_currency=USD or from_currency=BTC.%0A            to_currency: The destination currency for the exchange rate.%0A            It can either be a physical currency or digital/crypto currency.%0A             For example: to_currency=USD or to_currency=BTC.%0A            time_period:  How many data points to average (default 20)%0A            series_type:  The desired price type in the time series. Four types%0A                are supported: 'close', 'open', 'high', 'low' (default 'close')%0A        %22%22%22%0A        _FUNCTION_KEY = %22CURRENCY_EXCHANGE_RATE%22%0A        return _FUNCTION_KEY, 'Technical Analysis: SMA', 'Meta Data'%0A

Add cryptocurrencies class