Solved RFID Tag problem

# Before

def id_exists( id_tag ):
    scan = hex(id_tag)
    cursor.execute("SELECT COUNT(idTag) FROM prezenta p INNER JOIN studenti s ON p.matricol=s.matricol WHERE idTag= %s",(scan))
    print ("I am here")
    val_rows = cursor.fetchall()[0][0]
    print (val_rows)
    return val_rows

# After

def id_exists( id_tag ):
    scan_result = id_tag
    cursor.execute("""SELECT COUNT(idTag) FROM prezenta p INNER JOIN studenti s ON p.matricol=s.matricol WHERE idTag= %s""",[scan_result])
    print (val_rows)
    return val_rows