Listing HAL devices

[mukesh tiwari]

Hello all
I am trying to write a python script which detects usb pen drive and
copy all the data into my home directory. After bit of searching , i
found these two links 1] http://en.wikibooks.org/wiki/Python_Programming/Dbus
and 2] http://stackoverflow.com/questions/469243/how-can-i-listen-for-usb-device-inserted-events-in-linux-in-python
. I just copied the wiki program but after running it , i got error

import dbus


class BusListener:
        def __init__( self ):
                self.bus = dbus.SystemBus()
                self.hal_obj =
self.bus.get_object('org.freedesktop.Hal' , '/org/freedesktop/Hal/
Manager' )
                print self.proxy



if __name__ == "__main__":
        obj = BusListener()

Traceback (most recent call last):
  File "Mount.py", line 13, in <module>
    obj = BusListener()
  File "Mount.py", line 7, in __init__
    self.hal_obj = self.bus.get_object('org.freedesktop.Hal' , '/org/
freedesktop/Hal/Manager' )
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 244, in
get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/pymodules/python2.7/dbus/proxies.py", line 241, in
__init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 183, in
activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/bus.py", line 281, in
start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/pymodules/python2.7/dbus/connection.py", line 630, in
call_blocking
    message, timeout)
dbus.exceptions.DBusException:
org.freedesktop.DBus.Error.ServiceUnknown: The name
org.freedesktop.Hal was not provided by any .service files

Kindly some one please tell me why i am getting this error .
Thank you