A Blender Python script to generate an ico sphere with random colors applied to each face. Part 2 of a video tutorial https://www.youtube.com/watch?v=WnZX--idSQI

ico_sphere_random_color_faces_part_2.py

# give Python access to Blender's functionality
import bpy

# give Python access to Blender's mesh editing functionality
import bmesh

# extend Python functionality to generate random numbers
import random


def get_random_color():
    """generate a random color"""
    red = random.random()  # creates a value from 0.0 to 1.0
    green = random.random()
    blue = random.random()
    alpha = 1.0
    color = (red, green, blue, alpha)
    return color


def generate_random_color_materials(obj, count):
    """create and assign materials to the object"""
    for i in range(count):
        mat = bpy.data.materials.new(name=f"material_{i}")
        mat.diffuse_color = get_random_color()
        obj.data.materials.append(mat)


def add_ico_sphere():
    """add an ico sphere"""
    bpy.ops.mesh.primitive_ico_sphere_add(subdivisions=3)
    return bpy.context.active_object


def assign_materials_to_faces(obj):
    """iterates over all the faces of the object and
    assigns a random material to the face"""

    # turn ON Edit Mode
    bpy.ops.object.editmode_toggle()

    # deselect all faces
    bpy.ops.mesh.select_all()

    # get geometry data from mesh object
    bmesh_obj = bmesh.from_edit_mesh(obj.data)

    # get the number of materials assigned to the object
    material_count = len(obj.data.materials)

    # iterate through each face of the mesh
    for face in bmesh_obj.faces:

        # randomly select a material
        obj.active_material_index = random.randint(0, material_count)

        # select the face and assign the active material
        face.select = True
        bpy.ops.object.material_slot_assign()
        face.select = False

    # turn OFF Edit Mode
    bpy.ops.object.editmode_toggle()


ico_object = add_ico_sphere()

# create a variable for holding the the number of materials to create
material_count = 30

generate_random_color_materials(ico_object, material_count)

assign_materials_to_faces(ico_object)