def index():
    

    ## Shows the template index table
    ##

    ## Tries to initialize the sensor
    try:
        f = PyFingerprint('/dev/ttyUSB0', 57600, 0xFFFFFFFF, 0x00000000)

        if ( f.verifyPassword() == False ):
            raise ValueError('The given fingerprint sensor password is wrong!')

    except Exception as e:
        print('The fingerprint sensor could not be initialized!')
        print('Exception message: ' + str(e))
        exit(1)

    ## Gets some sensor information
    print('Currently stored templates: ' + str(f.getTemplateCount()))

    ## Tries to show a template index table page
    try:
        page = raw_input('Please enter the index page (0, 1, 2, 3) you want to see: ')
        page = int(page)

        tableIndex = f.getTemplateIndex(page)

        for i in range(0, len(tableIndex)):
            print('Template at position #' + str(i) + ' is used: ' + str(tableIndex[i]))

    except Exception as e:
        print('Operation failed!')
        print('Exception message: ' + str(e))
        exit(1)