Beginner Blender Python Tutorial: Python Classes; function version example 1 (used in tutorial: https://youtu.be/t2KEolkhIoA)

with_functions_example_1.py

import bpy


def create_mesh_data(verts, edges, faces):
    """
    create a mesh from the vert, edge, and face data
    """
    mesh_data = bpy.data.meshes.new("cube_data")
    mesh_data.from_pydata(verts, edges, faces)

    return mesh_data


def create_mesh_object_from_data(mesh_data):
    """
    create a object using the mesh data
    """
    return bpy.data.objects.new("cube_object", mesh_data)


def add_mesh_object_into_scene(mesh_object):
    """
    add object into active scene by linking the object into the 
    default scene collection
    """
    bpy.context.collection.objects.link(mesh_object)


def create_mesh_object(verts, edges, faces):
    """
    create a mesh object from the given verts, edges, and faces 
    add the new mesh object into the scene
    """
    mesh_data = create_mesh_data(verts, edges, faces)

    mesh_obj = create_mesh_object_from_data(mesh_data)

    add_mesh_object_into_scene(mesh_obj)

    return mesh_obj


def create_cube_with_square_faces():
    """
    create a cube with square faces
    """
    # define the coordinates of each vertex
    verts = [
        (-1.0, -1.0, -1.0),
        (-1.0, 1.0, -1.0),
        (1.0, 1.0, -1.0),
        (1.0, -1.0, -1.0),
        (-1.0, -1.0, 1.0),
        (-1.0, 1.0, 1.0),
        (1.0, 1.0, 1.0),
        (1.0, -1.0, 1.0),
    ]

    # define faces using the indexes of the vertices
    faces = [
        (0, 1, 2, 3),
        (7, 6, 5, 4),
        (4, 5, 1, 0),
        (7, 4, 0, 3),
        (6, 7, 3, 2),
        (5, 6, 2, 1),
    ]

    edges = []

    mesh_object = create_mesh_object(verts, edges, faces)

    return mesh_object


def main():
    create_cube_with_square_faces()


if __name__ == "__main__":
    main()