import dbus

NM = 'org.freedesktop.NetworkManager'
NMP = '/org/freedesktop/NetworkManager'
NMI = NM + '.Device'
PI = 'org.freedesktop.DBus.Properties'

def list_ssids():
  # get the base NetworkManager object and bind an interface  to it
  bus = dbus.SystemBus()
  nm = bus.get_object(NM,NMP)
  nmi = dbus.Interface(nm,NM)
  # Iterate over the devices queried via the interface
  for dev in nmi.GetDevices():
    # get each and bind a property interface to it
    devo = bus.get_object(NM,dev)
    devpi = dbus.Interface(devo,PI)
    # Single out the Wi-Fi ones
    if devpi.Get(NM,'DeviceType') == 2:
      wdevi = dbus.Interface(devo,NMI + '.Wireless')
      for ap in wdevi.GetAccessPoints():
         apo = bus.get_object(NM,ap)
         api = dbus.Interface(apo,PI)
         # unpack the SSID string
         print ''.join(["%c" % b for b in api.Get(NMI,'Ssid')])

if __name__ == '__main__':
  list_ssids()