def get_last_traded_dt(self, asset, dt, data_frequency):
        """
        Given an asset and dt, returns the last traded dt from the viewpoint
        of the given dt.

        If there is a trade on the dt, the answer is dt provided.
        """
        return self._get_pricing_reader(data_frequency).get_last_traded_dt(
            asset, dt)
Given an asset and dt, returns the last traded dt from the viewpoint
        of the given dt.

        If there is a trade on the dt, the answer is dt provided.