Convert the GPS data that extracted from GoPro Camera to NMEA-GPRMC format

NMEAconverter.py

# -*- coding: utf-8 -*-
import time
import datetime
import csv
import os 

def lat_lon(n):
    a,b=divmod(n,1)
    total=(a*100)+(b*60)
    return format(total, '.5f')

def gps_simulation(csvfile,filelist,dirlist):
    record=[] #original
    newrecord=[] #1 second 1 coordinate
    firstsec=0
    if not os.path.exists(dirlist):
        os.makedirs(dirlist)
    file = open(dirlist+"/"+filelist+"_NMEA.txt","w")
    
    '''with open(csvfile,'rb') as f:
        reader=csv.reader(f)
        for _ in range(7):
            next(reader)
        for row in reader:
            record.append(map(float,row))

    firstsec=record[0][0]
    
    newrecord.append(record[0])
    for i in record:
        tempsec=i[0]
        if tempsec-firstsec >= 1:
            newrecord.append(i)
            firstsec=i[0]
    
    for j in newrecord:
        times=datetime.datetime.utcfromtimestamp(j[0]).strftime('%H%M%S.00')
        date=datetime.datetime.utcfromtimestamp(j[0]).strftime("%d%m%Y")
        date=date[:-4]+date[-2:]
        speed=j[4] * 1.943846
        lat=lat_lon(j[1])
        lon=lat_lon(j[2])
        file.write('$GPRMC,'+str(times)+',A,'+str(lat)+',N,'+str(lon)+',E,'+str(speed)+',,'+str(date)+',,,A*74\n')'''
        
    with open(csvfile,'rb') as f:
        reader=csv.reader(f)
        for row in reader:
            del row[-1]
            record.append(map(float,row))

    '''firstsec=record[0][0]
    
    newrecord.append(record[0])
    for i in record:
        tempsec=i[0]
        if tempsec-firstsec >= 1:
            newrecord.append(i)
            firstsec=i[0]'''
    
    for j in record:
        #print j
        times=datetime.datetime.utcfromtimestamp(j[0]).strftime('%H%M%S.00')
        date=datetime.datetime.utcfromtimestamp(j[0]).strftime("%d%m%Y")
        date=date[:-4]+date[-2:]
        speed=j[4] * 1.943846
        lat=lat_lon(j[1])
        lon=lat_lon(j[2])
        file.write('$GPRMC,'+str(times)+',A,'+str(lat)+',N,'+str(lon)+',E,'+str(speed)+',,'+str(date)+',,,A*74\n')
        
    file.close()
    
#main
for root, dirs, files in os.walk(".\csv\gunpo"):
    for filelist in files:
        if filelist.endswith(".csv"):
            csvfile=os.path.join(root, filelist)
            dirlist=os.path.basename(os.path.normpath(root))
            gps_simulation(csvfile,filelist,dirlist)