what the fuck is wrong

def listave(list):
    UserInput = input('Enter integer (q to quit):')
    list.append(UserInput)
    while UserInput != 'q':
        UserInput = input('Enter integer (q to quit:)')
        if isinstance(UserInput, int) == True:
            list.append(UserInput)
        elif UserInput == 'q':
            break
    list.pop()
    print('Average: ', float(sum(list) / len(list)))

listave(list)