Blender - Select meshes with two or more material slots (For Alembic workflow)

import bpy

# Deselect all objects first
bpy.ops.object.select_all(action='DESELECT')

# Select mesh objects with 2 or more material slots
for obj in bpy.data.objects:
    if obj.type == 'MESH' and len(obj.material_slots) >= 2:
        obj.select_set(True)

# Make one of the selected objects active (optional)
selected = bpy.context.selected_objects
if selected:
    bpy.context.view_layer.objects.active = selected[0]