Python function that returns the (x,y,z) typle of the center of multiple objects, within blender

blender_center_of_object_collection.py

cntr = _center_of_object_collection([ D.objects['obj_example1'], D.objects['obj_example2'], ... ])

def _center_of_object_collection(obs):
    min_x = max_x = min_y = max_y = min_z = max_z = None
    for ob in obs:
        local_vertices = ob.bound_box[:]
        worldify = lambda p: ob.matrix_world * Vector(p[:])
        world_vertices = [worldify(p).to_tuple() for p in local_vertices]
        for (x,y,z) in world_vertices:
            if min_x is None or x < min_x:
                min_x = x
            if max_x is None or x > max_x:
                max_x = x
            if min_y is None or y < min_y:
                min_y = y
            if max_y is None or y > max_y:
                max_y = y
            if min_z is None or z < min_z:
                min_z = z
            if max_z is None or z > max_z:
                max_z = z
    return ( (max_x + min_x) / 2.00, (max_y + min_y) / 2.00, (max_z + min_z) / 2.00 )