Blender 2.9, Python, hexadecimal color specification

Today's challenge is to use the hexadecimal color code used in HTML Specify the material color and reflect it on the solid. First, specify about 3 colors. For the color, I referred to "Bochan Dumpling / Tsuboya Confectionery" (Ehime souvenir). (I changed from Blender 2.8 to 2.9 a few days ago. The Python script for 2.8 seems to work with 2.9 as well.)

#bpy_nh20 (material color using hex value)
#(HEX color designation)Blender 2.8 (python) - How to set material color using hex value instead of RGB

import bpy

# ========= DELETE ALL mesh, light, camera,2 lines to delete all=========
for item in bpy.data.objects:
    bpy.data.objects.remove(item)

# ======NEW CAMERA
bpy.ops.object.camera_add(enter_editmode=False, align='VIEW', location=(4, -6, 4), rotation=(1.3, 0, 0.5))
##(1.3, 0, -0.3)
# ====== NEW CUBE 
bpy.ops.mesh.primitive_cube_add(size=2,  align='WORLD', location=(0, 0, 0), scale=(1, 1, 1))

def hex_to_rgb( hex_value ):
    b = (hex_value & 0xFF) / 255.0
    g = ((hex_value >> 8) & 0xFF) / 255.0
    r = ((hex_value >> 16) & 0xFF) / 255.0
    return r, g, b

def add_material(obj, material_name, h):
    material = bpy.data.materials.get(material_name)
    if material is None:
        material = bpy.data.materials.new(material_name)
    material.use_nodes = True
    principled_bsdf = material.node_tree.nodes['Principled BSDF']
    if principled_bsdf is not None:
        principled_bsdf.inputs[0].default_value = (*hex_to_rgb(h), 1)  
    obj.active_material = material

#h = 0xE7E7FF
#h = 0x87ceeb #skyblue#87ceeb
#h = 0xadff2f #greenyellow#adff2f
#h = 0xee82ee #violet#ee82ee
#saddlebrown#8b4513
#moccasin#ffe4b5
#olive#808000

obj = bpy.context.object
add_material( obj, "test1", 0x8b4513)  #saddlebrown#8b4513

bpy.ops.mesh.primitive_cube_add(size=2,  align='WORLD', location=(0, 2, 2), scale=(1, 1, 1))
obj = bpy.context.object
add_material( obj, "test2", 0xffe4b5 ) #moccasin#ffe4b5

bpy.ops.mesh.primitive_cube_add(size=2,  align='WORLD', location=(0, 4, 4), scale=(1, 1, 1))
obj = bpy.context.object
add_material( obj, "test3", 0x808000 ) #olive#808000

# ============== "light_spot1" ==== HIGH 
# create light datablock, set attributes
light_data = bpy.data.lights.new(name="light_spot1", type='SPOT')
light_data.energy = 700
# create new object with our light datablock
light_object1 = bpy.data.objects.new(name="light_spot1", object_data=light_data)
# link light object
bpy.context.collection.objects.link(light_object1)
# make it active 
bpy.context.view_layer.objects.active = light_object1
#change location
light_object1.location = (-5, -7, 4)
light_object1.delta_rotation_euler = (1.3, 0, -0.3) #Look straight down at zero zero zero.
# update scene, if needed
dg = bpy.context.evaluated_depsgraph_get() 
dg.update()
# ================
# =========================== end of bpy_nh20