Blender - Replace materials with .001 (For Alembic workflow)

import bpy

for obj in bpy.data.objects:
    if obj.type != "MESH":
        continue

    for slot in obj.material_slots:
        mat = slot.material
        if not mat:
            continue

        src_name = mat.name
        target_name = src_name + ".001"

        target_mat = bpy.data.materials.get(target_name)
        if target_mat:
            slot.material = target_mat