swap.py

#! /usr/bin/env python3

from gi.repository import GLib, UDisks

no_options = GLib.Variant('a{sv}', {})

udisks = UDisks.Client.new_sync(None)
manager = udisks.get_object_manager()
for item in manager.get_objects():
    part = item.get_partition()
    swap = item.get_swapspace()
    if not swap or not part:
        continue
    block = item.get_block()
    print(block.props.id_uuid)         
    print(block.props.device)