python IndexError list index out of range + how to break a while then also restart the while statement -


please swipe card: chend151 traceback (most recent call last): file "c:\attendance\attendance 3.py", line 42, in <module> clcode = datalist[period][d] indexerror: list index out of range

i error when running code, can't seem find problem :/

my code: 

import csv import datetime import os  class_ = 'n004'  while (1):     #day & time checker     format = "%h%m%s"     format_ = "%h%m"     today = datetime.datetime.today()     s = today.strftime(format) #time in 24hour     s2 = today.strftime(format_)     d = datetime.datetime.today().weekday() #day of week (0-5)     period = -1 #if scan outside of dedicated periods defaults unknown period`      #period checker     if "084500" < s < "094000":         period = 0     if "094000" < s < "104000":         period = 1     if "112000" < s < "121500":         period = 2     if "121500" < s < "131500":         period = 3     if "133500" < s < "143000":         period = 4      #magnetic card reader output & attendance (default = 0)     attendance = '0'     eqid = str(input('please swipe card: '))      #class code reader     datalist = []     open(class_+'.csv', 'r') csvfile:       csvreader = csv.reader(csvfile)       row in csvreader:          datalist.append(row)     csvfile.close()      #class code     clcode = datalist[period][d]       #csv writer     ofile = open('attendance.csv', "a")     writer = csv.writer(ofile, delimiter=',')     writer.writerow([eqid, period+1, clcode, attendance])      ofile.close()  `#os.rename("j:/attendance/attendance.csv", "j:/g_drive/attendance.csv")`  sorry formatting still can't seem understand how formatting works code :c   also, question, in while statement want have if statement   `if eqid == "n004":     class_ = "n004"     break

i know indentation off how break loop restart it? want if enter n004 breaks loop sets class_ = 'n004' restarts while loop , if don't enter n004 loop continue normal.

thank you, makes sense.

edit: try explain want, think have more 1 question, firstly thank helping. want have 1 print statement asks user swipe card or insert username , in same print statement asks them type current class in (eg n004') , whatever type gets exported csv file, have setup already, when type in class example n004 want while loop break n004 doesnt exported csv file. i'm not best @ explaining want in 300 characters

eqid = str(input('please swipe card: '))  if eqid == "n004":     class_ = "n004"     continue else:     print ("didn't work")

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