Returns a list of unique symmetrically equivalent k-points.

        Args:
            kpoint (1x3 array): coordinate of the k-point
            cartesian (bool): kpoint is in cartesian or fractional coordinates
            tol (float): tolerance below which coordinates are considered equal

        Returns:
            ([1x3 array] or None): if structure is not available returns None

def get_sym_eq_kpoints(self, kpoint, cartesian=False, tol=1e-2):
        """
        Returns a list of unique symmetrically equivalent k-points.

        Args:
            kpoint (1x3 array): coordinate of the k-point
            cartesian (bool): kpoint is in cartesian or fractional coordinates
            tol (float): tolerance below which coordinates are considered equal

        Returns:
            ([1x3 array] or None): if structure is not available returns None
        """
        if not self.structure:
            return None
        sg = SpacegroupAnalyzer(self.structure)
        symmops = sg.get_point_group_operations(cartesian=cartesian)
        points = np.dot(kpoint, [m.rotation_matrix for m in symmops])
        rm_list = []
        # identify and remove duplicates from the list of equivalent k-points:
        for i in range(len(points) - 1):
            for j in range(i + 1, len(points)):
                if np.allclose(pbc_diff(points[i], points[j]), [0, 0, 0], tol):
                    rm_list.append(i)
                    break
        return np.delete(points, rm_list, axis=0)