Python SQLite用户查询未通过验证

Question

I am writing a python function that takes an input from a user, searches for it in a database and then checks the input against the return result and if correct proceeds with the program and if incorrect asks the user to re-enter. This doesn't work however. When a user enters something it just says it is incorrect as per my program. Here is the code:

def TakeOutItem():
Serial = input("Please enter the serial number of the music you are taking out: ")
SerialN = int(Serial,)
with sqlite3.connect("school.db") as db:
    cursor = db.cursor()
    cursor.execute("SELECT SerialNo FROM Music WHERE SerialNo=?",(SerialN,))
    data = cursor.fetchone()[0]
    print(">>",SerialN, data,">>")
    print(type(SerialN),type(data)).show
    print(int(SerialN) == int(data))
    if SerialN == int(data):
        DateOut = date.today()
        DateIn = date.today() + timedelta(days=30)
        cursor.execute('SELECT Name FROM Music WHERE SerialNo=?', Serial)
        NameofMusic = cursor.fetchone()
        cursor.execute('SELECT StudentID FROM Student WHERE username=?', student_login(username))
        StudentID = cursor.fetchone()
        cursor.execute('INSERT INTO MusicLoan VALUES (?,?,?,?,?)', DateOut, DateIn, Music, NameofMusic, StudentID)
        print("Item taken out successfully")
        student_menu()

    else:
        print("Incorrect Serial Number please try again")
        TakeOutItem()

and this is the error screen

What would you like to do?

1. Take out item

2. Return item

3. Exit

Please select an option number: 1

Please enter the serial number of the music you are taking out: 1
>> 1 1 >>
<class 'int'> <class 'int'>
Please select a valid option

The it takes me back to he previous menu

How can I fix this error??

Answer 1

cursor.fetchone() will always return a tuple .So use

data = cursor.fetchone()[0]

or

if SerialN == data[0]:

Inside your if condition also, please rewrite it to NameofMusic[0] and StudentID[0] in your INSERT query