Pi Hiker - Displaying GPS data

Just a simple Python script to display the location data to the LCD (PiFace CAD):

*This is not by any means a clean program - I haven't removed unneeded imports and the display portion includes a counter I was intending to use but haven't implemented yet*

*This is just a simple demo to show it is working*

#!/usr/bin/env python3
"""
Grab data from GPS and spit it out to LCD
"""


import sys
PY3 = sys.version_info[0] >= 3
if not PY3:
    print("Please use `python3`.")
    sys.exit(1)


###import libraries and set up gps
import urllib.request
import xml.etree.ElementTree
from time import sleep
from threading import Barrier
import pifacecommon
import pifacecad
import sys,math,time,microstacknode.gps.l80gps
gps=microstacknode.gps.l80gps.L80GPS()


current_pos=False
while current_pos==False:
    try:          # try command used to prevent crash when no response from GPS
        current_pos=gps.gpgll          # gets current GPS position
    except (microstacknode.gps.l80gps.DataInvalidError, microstacknode.gps.l80gps.NMEAPacketNotFoundError):          # if no GPS response or if response is invalid
            time.sleep(1)                    #pauses before retry to connect to GPS
#print(current_pos)                                # for debugging
cad=pifacecad.PiFaceCAD()
cad.lcd.backlight_on()
cad.lcd.cursor_off()
cad.lcd.blink_off()
cad.lcd
count=0
last_pos=0
while True:
    try:          # try command used to prevent crash when no response from GPS
        current_pos=gps.gpgll          # gets current GPS position
    except (microstacknode.gps.l80gps.DataInvalidError, microstacknode.gps.l80gps.NMEAPacketNotFoundError):          # if no GPS response or if response is invalid
            time.sleep(1)                    #pauses before retry to connect to GPS
    cad.lcd.home()
#    cad.lcd.write(str(count))
    if last_pos != current_pos:
        last_pos = current_pos
#        cad.lcd.write(str(count)+", "+str(current_pos["latitude"])+"\n"+str(current_pos["longitude"]))
        cad.lcd.write(str(current_pos["latitude"])+"\n"+str(current_pos["longitude"]))
        count += 1
    else:
        count = 1