Mat = OBJECT.getOrientation()
RotX = Mathutils.RotationMatrix(VALUE_OF_X, 3, 'x')
RotY = Mathutils.RotationMatrix(VALUE_OF_Y, 3, 'y')
RotZ = Mathutils.RotationMatrix(VALUE_OF_Z, 3, 'z')
Mat = Mathutils.Matrix(Mat[0],Mat[1],Mat[2]) * RotX * RotY * RotZ
Mat = [[Mat[0][0],Mat[0][1],Mat[0][2]],[Mat[1][0],Mat[1][1],Mat[1][2]],[Mat[2][0],Mat[2][1],Mat[2][2]]]
OBJECT.setOrientation(Mat)