python --- kivételkezelés. IndexError és egyebek

Az utolsó bekezdésed falhozvágott :)
Nem akarom hogy tovább fusson..

Amúgy sorhiba csak ritkán jelentkezik úgy, hogy nincs index.

Példa:
$GPRMC,135938.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*5D
$GPRMC,135943.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*51
$GNRMC,135948.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*44
$GNGLL,4729.7200,N,01902.3363,E,13$GPRMC,135953.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*50
$GLGSV,3,2,09,83,34,288,$GPRMC,135958.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*5B
$GLGSV,3,2,09,83,34,288,$GPRMC,140003.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*5E
$GPRMC,140004.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*59
$GPVTG,43.98,T,,M,0.00,N,0.00,$GPRMC,140008.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*55
$GPRMC,140009.000,A,4729.7200,N,01902.3363,E,0.00,43.98,051215,,,A*54
$GPRMC,140024.000,A,4729.7078,N,01902.3299,E,0.90,188.56,051215,,,A*6F
$GPRMC,140029.000,A,4729.7065,N,01902.3293,E,0.81,194.91,051215,,,A*62
$GPRMC,140030.000,A,4729.7063,N,01902.3291,E,0.80,194.51,051215,,,A*63
$GPRMC,140034.000,A,4729.7065,N,01902.3287,E,0.00,187.78,051215,,,A*67
$GPRMC,140039.000,A,4729.7065,N,01902.3287,E,0.00,187.78,051215,,,A*6A
$GPRMC,140044.000,V,,,,,0.17,257.05,051215,,,E*42
$GPRMC,140045.000,A,4729.7102,N,$GNRMC,140049.000,A,4729.7106,N,01902.3292,E,0.00,279.31,051215,,,A*7C
$GLGSV,3,1,09,67,67,029,,77,45,122,,68,36,$GNRMC,140054.000,A,4729.7106,N,01902.3292,E,0.00,279.31,051215,,,A*70
$GLGSV,3,1,09,67,67,029,,77,45,122,,68,36,$GNRMC,140059.000,A,4729.7106,N,01902.3292,E,0.00,279.31,051215,,,A*7D
$GNRMC,140100.000,A,4729.7106,N,01902.3292,E,0.00,279$GNRMC,140104.000,A,4729.7106,N,01902.3292,E,0.00,279.31,051215,,,A*74
$GNRMC,140125.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*4C
$GNRMC,140130.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*48
$GNRMC,140131.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*49
$GNRMC,140135.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*4D
$GNRMC,140140.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*4F
$GNRMC,140145.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*4A
$GNRMC,140150.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*4E
$GNRMC,140155.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*4B
$GNRMC,140200.000,A,4729.7133,N,01902.3378,E,0.00,76.52,051215,,,A*48

Vannak hosszabb sorok is, melyeknek eleje használható, de eddig a rövideknél elszállt az egész.

Különleges gond még az, hogy reguláris kifejezést szeretnék a sor elejére illeszkedésre, de a ^ jellel sehogy sem boldogulok, mert közben ott a sor elején a $ jel, ami meg a sor végére illeszkedik.

---
--- A gond akkor van, ha látszólag minden működik. ---
---

Jó ronda nagy lett a kód is:

#!/usr/bin/env python
# coding: utf8

from __future__ import print_function
import serial, io, re
import pcd8544.lcd as lcd
import time, os, sys, getopt
import textwrap


# RTC orabol a datum kiszedese
from datetime import datetime
d = datetime.now()
rtctime = "{:%Y-%m-%d_%H:%M:%S}".format(d)
#rtctime = "at {:%H:%M} UTC".format(d)
print (rtctime+" fajlba iras kezdete...")

lcd.init()
if ( lcd.LED != 1 ):
  sys.exit('LED pin should be GPIO1 (12)')
# Backlight PWM testing -- off -> 25% -> off
for i in range(0,1023,16):
  lcd.set_brightness(i)
  time.sleep(0.025)

import RPi.GPIO as GPIO  
if GPIO.RPI_REVISION == 1:  
    ports = [0, 1, 21]  
elif GPIO.RPI_REVISION == 2:  
    ports = [2, 3, 27]  
else:
    ports = ["whatever the new changes will be"]
#print "Your Pi is a Revision %s, so your ports are: %s" % (GPIO.RPI_REVISION, ports)





if not os.geteuid() == 0:
    sys.exit('Script must be run as root')

addr  = '/dev/ttyAMA0'  # serial port
baud  = 9600            # baud rate
fname = '/home/pi/gpslogger/gps-log/'+rtctime   # log file rtctime szerint
fmode = 'a'             
with serial.Serial(addr,9600) as pt, open(fname,fmode) as outf:
 spb = io.TextIOWrapper(io.BufferedRWPair(pt,pt,1),
  encoding='ascii', errors='ignore', newline='\r',line_buffering=True)

 while (1):
  x = spb.readline()  # read one line of text from serial port
  if 'GNRMC' in x:      # GNRMC: glonass, GPRMC: gps

   outf.write(x)       # write line of text to file
   outf.flush()        # make sure it actually gets written out


   print (x)
   sorhossz = 14
   balra = x.ljust(sorhossz)
   kiirni = balra
   print (textwrap.fill(kiirni, 14))
   
   cucc = kiirni.split(',')  # ez szeletel
   print ("{[0]}".format(cucc))


   try:
    longitude="L: ""{[3]}".format(cucc)+"{[4]}"
    print (longitude.format(cucc))
   except IndexError:
    print ('nincs longitude')


   try:
    latitude="G:""{[5]}".format(cucc)+"{[6]}"
    print (latitude.format(cucc))
   except IndexError:
    print ('nincs latiitude')

   idokiiras="{[1]}".format(cucc)
#   print ('at '+idokiiras[:6]+' UTC')
   print ('at '+idokiiras[:2]+':'+idokiiras[2:4]+' UTC')


   try:
    cog_korlat='0.3'   # hogy ne ugraljon nekem a szam itt
    brg="{[7]}"
    if ( brg > cog_korlat ):
     brg = "0"
     print ('BRG:'+brg+'kn')
    else:
     print ('BRG:',brg.format(cucc))
   except IndexError:
    print ('nincs ')


   try:
    cog_korlat='0.3'
    brg="{[7]}"
    cog="{[8]}"
    if ( brg > cog_korlat ):
     cog = "-"
     print ('COG:'+cog)
    else:
     print ('COG:',cog.format(cucc))
   except IndexError:
    print ('nincs ')


   try:
    datum="{[9]}"
    print (datum.format(cucc))
   except IndexError:
    print ('nincs ')

   try:
    v4="{[10]}"
    print (v4.format(cucc))
   except IndexError:
    print ('nincs ')


   try:
    v5="{[11]}"
    print (v5.format(cucc))
   except IndexError:
    print ('nincs ')


   print (kiirni)
   lcd.text(kiirni)
   time.sleep(5)
#   lcd.cls()
   #print ("1-----------",sorhossz)

---
--- A gond akkor van, ha látszólag minden működik. ---
---