futures.py 文件源码

def as_of(self, dt):
        """ Get the future chain for this root symbol as of a specific date.

        Parameters
        ----------
        dt : datetime.datetime or pandas.Timestamp or str, optional
            The as_of_date for the new chain.

        Returns
        -------
        FutureChain

        """
        return FutureChain(
            asset_finder=self._asset_finder,
            get_datetime=self._algorithm_get_datetime,
            root_symbol=self.root_symbol,
            as_of_date=Timestamp(dt, tz='UTC'),
        )