def correspond_on_equivalents(self, column, equivalents):
        """Return corresponding_column for the given column, or if None
        search for a match in the given dictionary.

        """
        col = self.corresponding_column(column, require_embedded=True)
        if col is None and equivalents in col:
            for equiv in equivalents[col]:
                nc = self.corresponding_column(equiv, require_embedded=True)
                if nc:
                    return nc
        return col
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/sql/selectable.py/FromClause.correspond_on_equivalents/swapped operands of `in`