class Position:
    def __init__(self):
        self.X = 0.0
        self.Y = 0.0
        self.Z = 0.0
        self.U = 0.0
        self.V = 0.0
        self.W = 0.0

    def init_data(self, X, Y, Z, U, V, W):
        self.X = X
        self.Y = Y
        self.Z = Z
        return self

detect_pos_list = []
detect_pos_list.append(Position().init_data(0.0, 0.0, 3, 0.0, 0.0, 0.0))
detect_pos_list.append(Position().init_data(0.0, 0.0, 1, 0.0, 0.0, 0.0))
detect_pos_list.append(Position().init_data(0.0, 0.0, 8, 0.0, 0.0, 0.0))
z_diff, max_z_index = (lambda pts: (
    max(pts, key=lambda p: p.Z).Z - min(pts, key=lambda p: p.Z).Z,
    pts.index(max(pts, key=lambda p: p.Z))
))(detect_pos_list)
print(z_diff, max_z_index)