Radiosonde to NMEA script

gps.py

#!/usr/bin/python3 -u

import sys

for line in sys.stdin:
    s = line.split(' ')
    if len(s) < 14:
        continue
    time = s[4]
    lat = s[7]
    lon = s[10]
    alt = s[13]
    t = time.split(':')
    time = t[0] + t[1] + t[2].split('.')[0]
    l = lat.split('.')
    if l[0][0] == '-':
        ns = 'S'
        l[0] = l[0][1:]
    else:
        ns = 'N'
    lat = l[0] + str(float('0.'+l[1])*60)[:6]
    l = lon.split('.')
    if l[0][0] == '-':
        ew = 'W'
        l[0] = l[0][1:]
    else:
        ew = 'E'
    lon = l[0] + str(float('0.'+l[1])*60)[:6]
    print("$GPRMC,{},A,{},{},{},{},0.0,0.0,010100,,,".format(time,lat,ns,lon,ew))
    print("$GPGGA,{},{},{},{},{},1,08,1.0,{},M,0.0,M,,".format(time,lat,ns,lon,ew,alt))