import dbus

bus = dbus.SystemBus()
hal_manager_obj = bus.get_object("org.freedesktop.Hal", "/org/freedesktop/Hal/Manager")
hal_manager = dbus.Interface(hal_manager_obj, "org.freedesktop.Hal.Manager")
#device_names = hal_manager.GetAllDevices()

ac = hal_manager.FindDeviceByCapability("ac_adapter")

#all_devices = hal_manager.GetAllDevices()

#for n in device_names: print n
#obj = bus.get_object("org.freedesktop.Hal", u'/org/freedesktop/Hal/devices/acpi_AC')
#obj.GetAllProperties()

name = ac[0]
device_dbus_obj = bus.get_object("org.freedesktop.Hal" ,ac[0])
properties = device_dbus_obj.GetAllProperties(dbus_interface="org.freedesktop.Hal.Device")

try:
    parent_name = properties["info.parent"]
except KeyError:
    # no parent, must be parent of virtual_root
    parent_name = "/"
except TypeError:
    print "Error: no properties for device %s"%name
    #continue
print properties['ac_adapter.present']
#for p in properties:
#    print p, " :: ", properties[p]
if properties['ac_adapter.present']:
    print "plugged in"
else:
    print "unplugged"