main.py

import cv2
import numpy as np
import pyzbar.pyzbar as pyzbar
import sys
import time
import pybase64



# Start web cam

cap = cv2.VideoCapture(0)

names =[]

# function for attendence file

fob=open('attendence.txt', 'a+')

def enterData(z):
    if z in names:
        pass
    else:
        names.append(z)
        z=''.join(str(z))
        fob.write(z+'\n')
        return names 

print('Reading code.........')

# function data present or not

def checkData(data):
    data = str(data)
    if data in names:
        print('Already present')
    else:
        print('\n'+str(len(names)+1)+ '\n'+'Present done')
        enterData(data)

while True:
    _,frame = cap.read()
    decodedObject = pyzbar.decode(frame)
    for obj in decodedObject:
        checkData(obj.data)
        time.sleep(1)


    cv2.imshow('Frame',frame)

    # close
    if cv2.waitKey(1)& 0xFF==ord('s'):
        cv2.destroyAllWindows()
        break

fob.close()