GPS

https://github.com/Knio/pynmea2

import pynmea2

import serial, time

piw = serial.Serial('/dev/ttyAMA0', 9600, timeout=1)

piw.open()

while 1:

        raw = piw.readline()

        if raw.find("GPGGA")==1 :

                msg = pynmea2.parse(raw)

                lat = round((msg.latitude),6)

                lon = round((msg.longitude),6)

                print str(lat)+","+str(lon)