How to duplicate object with independent modifiers, using Python

Question

I'd like to replicate copying (CTRL+C) and pasting (CTRL+V) an object using Python, i.e. the copy should be identical, yet completely independent of the original (i.e., if I change something about the original, the copy should not be affected). While this is easy to achieve for some properties, by copying the object data or calling bpy.ops.object.make_single_user(type='SELECTED_OBJECTS', object=True, obdata=True, material=True, animation=True, obdata_animation=True), I did not find a way yet to do this for modifiers, such as geometry nodes. Is there an easy way to achieve this?

Thanks.

Answer 1

Thanks to @relaxed, I found a solution that works for me, for the moment. However, be aware that there might be other data blocks (apart from node setups, particle settings and textures) that need to be copied as well.

def create_duplicate(object_: bpy.types.Object, 
                     duplicate_name: str, 
                     target_collection: bpy.types.Collection) -> bpy.types.Object:
    duplicate = object_.copy()
    duplicate.data = object_.data.copy()
    duplicate.name = duplicate_name
    
    target_collection.objects.link(duplicate)
    
    bpy.ops.object.select_all(action="DESELECT")
    bpy.context.view_layer.objects.active = duplicate
    duplicate.select_set(True)

    bpy.ops.object.make_single_user(object=True, 
                                    obdata=True, 
                                    material=True, 
                                    animation=True, 
                                    obdata_animation=True)
    
    for particle_system in duplicate.particle_systems:
        particle_system.settings = particle_system.settings.copy()

    for modifier in duplicate.modifiers:
        bpy.ops.object.modifier_set_active(modifier=modifier.name)
        
        if modifier.type == "NODES":
            bpy.ops.node.copy_geometry_node_group_assign()
        elif hasattr(modifier, "texture"):
            modifier.texture = modifier.texture.copy()
            
    return duplicate