How do I use tabs and spaces? (how to resolve error TabError: inconsistent)

[Onanism]

Hello I like to import transactions into Gnu-Cash. By default my bank export is not suitable for Gnu-cash. To make it suitable I need to run it through a Python script. I am using this script below that I found on the internet. I assume that I can use this script because it was publicly available. I was not able to approach the author of the script.

While running the script it give the error TabError: inconsistent use of tabs and spaces in indentation

So I replaced all the tabs with spaces, but that gave a error that said that I had to use spaces.

I am not a programmer; my goals is to use this script to import data into Gnu Cash. I hope someone can help me to run this script, so I can start using Gnu-cash.

###################################
# Name script: knab.py            #
# Parameter  : Input file         #
# Author     : Bastiaan Krijgsman #
# Version    : 0.1                #
# Date       : 03-05-2017         #
###################################  

from datetime import datetime
import sys, csv, os

class Bank:
	ifname = ""
	ofname = ""

	def __init__(self,ifile):
		self.ifname = ifile
		self.ofname = str(os.path.splitext(ifile)[0]) + "_" + str(datetime.now().year) + ".csv"

        def gencsvk(self):	
		ifile = open(self.ifname,"rb")
		reader = csv.reader(ifile,delimiter=';')

		ofile = open(self.ofname,"wb")
		writer = csv.writer(ofile,delimiter=',',quotechar='"',quoting=csv.QUOTE_ALL)
		writer.writerow(["Rekening","Datum","Omschrijving","Toelichting","Opname","Storting"])

		## "Rekeningnummer","Transactiedatum","Valutacode","CreditDebet","Bedrag","Tegenrekeningnummer","Tegenrekeninghouder","Valutadatum;
		## Betaalwijze;Omschrijving;Type betaling;Machtigingsnummer;Incassant ID;Adres;
                reader.next()
                reader.next()
                
		for row in reader:
                        
			rekening = row[0]
			datum = row[1]
			#omschrijving = row[10] + " " + row[11] + " " + row[12] + " " + row[13] + \
			#	" " + row[14] + " " + row[15] + " " + row[16] + " " + row[17] + \
			#	" " + row[18]
                        omschrijving = row[9]
			opname = 0
			storting = 0
			toelichting = row[5] + " " + row[6] + " " + row[8] + " " + row[13] 
			if row[3] == "D":
				opname = row[4]
			if row[3] == "C":
				storting = row[4]


			nrow = rekening,datum,omschrijving,toelichting,opname,storting
			print row[4]+ " " + row[6]
			writer.writerow(nrow)

bank = Bank(sys.argv[1])
bank.gencsvk()
if len(sys.argv) < 2:
        print "No input file name given!"
        exit()

Import.csv

KNAB EXPORT;;;;;;;;;;;;;;;;
Rekeningnummer;Transactiedatum;Valutacode;CreditDebet;Bedrag;Tegenrekeningnummer;Tegenrekeninghouder;Valutadatum;Betaalwijze;Omschrijving;Type betaling;Machtigingsnummer;Incassant ID;Adres;Referentie;Boekdatum;
"NL00KNAB0000000000";"06-05-2021";"EUR";"D";"115,89";"NL47RABSDFE64";"AF74 B.V.";"06-05-2021";"iDEAL";"Siet et al AF74 B.V.";"";"";"";"";"C1E0634ZJ";"06-05-2021";
"NL00KNAB0000000000";"06-05-2021";"EUR";"C";"150";"5775SDF39";"Kees de Leeuw";"06-05-2021";"Ontvangen betaling";"";"";"";"";"";"C1E06423VPZK";"06-05-2021";
"NL00KNAB0000000000";"03-05-2021";"EUR";"D";"1,85";"BE85739SDF55506";"Alipay";"03-05-2021";"iDEAL";"Hk E-Commerce";"";"";"";"";"C1E023405B";"03-05-2021";
"NL00KNAB0000000000";"20-04-2021";"EUR";"D";"3,39";"BE85739SD55506";"FS Services S.A.";"21-04-2021";"iDEAL";"Aly EUROPE LTD S.A";"";"";"";"";"C1D20werXHI";"20-04-2021";