Alterando o label de um disco, com dbus

gistfile1.py

import dbus

def changelabel(device, newlabel):
    """Change label of device.
    >>> changelabel('/dev/sdc1','Boot')
    True
    >>> changelabel('/dev/sxpto','Data')
    False
    """        
    res = False
    try:
        bus = dbus.SystemBus()
        proxy = bus.get_object('org.freedesktop.UDisks','/org/freedesktop/UDisks')
        iface = dbus.Interface(proxy, 'org.freedesktop.UDisks')

        for dev in iface.EnumerateDevices():
            dev_obj = bus.get_object('org.freedesktop.UDisks', dev)
            dev_prop = dbus.Interface(dev_obj, 'org.freedesktop.DBus.Properties')
            if dev_prop.Get('','DeviceFile')==device:
                idev = dbus.Interface(dev_obj, 'org.freedesktop.DBus.UDisks.Device')
                idev.get_dbus_method('FilesystemSetLabel', dbus_interface='org.freedesktop.UDisks.Device')(newlabel)
                res = True
    finally:
        return res