TypeError cannot unpack non-iterable NoneType object
from cv2 import cv2
import numpy as np
import pyzbar.pyzbar as pyzbar
import base64
import time
import datetime
import xlwt
from xlwt import Workbook
cap = cv2.VideoCapture(0)
font = cv2.FONT_HERSHEY_PLAIN
fob=open('attendence.txt','w+')
names=[]
def enterData(z):
if z in names:
pass
else:
names.append(z)
z=''.join(str(z))
fob.write(z+'n')
return names
print('Reading...')
def checkData(data):
try:
data=str(base64.b64decode(data).decode())
except(TypeError):
print('Invalid ID !!!')
return
if data in names:
print('Already Present')
else:
print('n'+str(len(names)+1)+'n'+data)
enterData(data)
cv2.putText(frame, str(base64.b64decode(obj.data)), (50, 50), font, 2,
(255, 0, 0), 3)
while True:
_,frame = cap.read()
decodedObjects = pyzbar.decode(frame)
for obj in decodedObjects:
checkData(obj.data)
#print("Data", base64.b64decode(obj.data))
#enterData(base64.b64decode(obj.data))
#print(len(names))
#sys.stdout.write('r'+'Reading...'+str(len(names))+'t'+str(base64.b64decode(obj.data)))
#sys.stdout.flush()
time.sleep(1)
cv2.imshow("Frame", frame)
if cv2.waitKey(1)& 0xFF == ord('s'):
cv2.destroyAllWindows()
break
fob.close()
d_date = datetime.datetime.now()
reg_format_date = d_date.strftime("%d-%m-%Y %I:%M:%S %p")
reg_format_date=reg_format_date.replace(':',' ')
def writeExcel(names,reg_format_date):
wb = Workbook()
sheet1 = wb.add_sheet('Sheet 1')
for i in range(0,len(names)):
sheet1.write(i, 1, names[i])
wb.save(reg_format_date+'.xls')
writeExcel(names,reg_format_date)
Hello, The “TypeError: cannot unpack non-iterable NoneType object” error is raised when you try to unpack values from one that is equal to None. A common cause of this error is when you try to unpack values from a function that does not return a value. To solve cannot unpack non-iterable nonetype object error, make sure the value you are trying to unpack is a sequence, such as a list or a tuple.
Answer (1)
Hello @ slope game, the error message "TypeError: cannot unpack non-iterable NoneType object" typically indicates that a function is trying to return multiple values, but it is returning None instead. In your code, this can happen in a few places, particularly with the cap.read() method or any function that is expected to return a value but is not. I think you shold ensure that all functions that are supposed to return values do so. Specifically, the checkData() and enterData() functions seem to be working fine, but make sure they are always returning the expected types.