import location
import gobject

def on_error(control, error, data):
    print "location error: %d... quitting" % error
    data.quit()

def on_changed(device, data):
    if not device:
        return
    if device.fix:
        if device.fix[1] & location.GPS_DEVICE_LATLONG_SET:
            print "lat = %f, long = %f" % device.fix[4:6]
            data.stop()

def on_stop(control, data):
    print "quitting"
    data.quit()

def start_location(data):
    data.start()
    return False

loop = gobject.MainLoop()
control = location.GPSDControl.get_default()
device = location.GPSDevice()
control.set_properties(preferred_method=location.METHOD_USER_SELECTED,
                       preferred_interval=location.INTERVAL_DEFAULT)

control.connect("error-verbose", on_error, loop)
device.connect("changed", on_changed, control)
control.connect("gpsd-stopped", on_stop, loop)

gobject.idle_add(start_location, control)

loop.run()

Nokia-N900-42-11:~# python test-location.py
lat = 39.400000, long = 0.000000
quitting

Nokia-N900-42-11:~# python test-location2.py
lat = 39.400000, long = 0.000000
lat = 40.796683, long = -73.922741