gps Ex 003(@resources used@).py

import time
from time import strftime

def dms_to_dec(value, dir):
    mPos = value.find(".")-2

    degree = float(value[:mPos])
    minute = float(value[mPos:])

    converted_degree = float(degree) + float(minute)/float(60)
    
    if dir == "W":
        converted_degree = -converted_degree
    elif dir == "S":
        converted_degree = -converted_degree

    return "%.9f" % float(round(converted_degree, 8))

def format_time(value):
    pre = strftime("%Y-%m-%dT")
    hour = value[:2]
    minute = value[2:4]
    second = value[4:6]
    timeval = pre + hour + ":" + minute + ":" + second + "Z"
    return timeval

def convert(inputName, outputName):
    data = open(inputName, "r")
    file = open(outputName, 'w')

    file.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<gpx version=\"1.0\">\n") 
    file.write("<trk>\n<trkseg>\n")

    for line in data:
        gpgga = line.split(',')
    if gpgga[0] == '$GPGGA':
        lat_val = dms_to_dec(gpgga[2], gpgga[3])
        long_val = to_dec(gpgga[4], gpgga[5])
        strtrkpt = "<trkpt lat=\"" + str(lat_val) + "\" lon=\"" + str(long_val) + "\"> <time>" + format_time(gpgga[1]) + "</time> </trkpt>\n"
        file.write(strtrkpt)

    file.write("</trkseg>\n</trk>\n</gpx>\n")
    file.close()

# main
convert('nmea.txt','nmea.gpx')
print ("Done!")