我有一個我自己無法解決的問題（我嘗試了很多，time.time()但我從來沒有解決我的問題）。如果 15 秒過去了，我希望我的程序退出并停止等待手指。如果有人知道如何在 python 中做到這一點，我會非常高興和感激！非常感謝！問我是否有任何問題！代碼在下面！import sysimport ossys.path.insert(0, '/home/pi/scripts')import subprocessimport lcddriverfrom time import *lcd = lcddriver.lcd()lcd.lcd_clear()import hashlibfrom pyfingerprint.pyfingerprint import PyFingerprint## Tries to initialize the sensortry:f = PyFingerprint('/dev/ttyUSB0', 57600, 0xFFFFFFFF, 0x00000000)if ( f.verifyPassword() == False ):    raise ValueError('The given fingerprint sensor password is wrong!')except Exception as e:lcd.lcd_display_string('Initialization failed!', 2)print('Exception message: ' + str(e))exit(1)## Gets some sensor informationprint('Currently used templates: ' + str(f.getTemplateCount()) +'/'+ str(f.getStorageCapacity()))## Tries to search the finger and calculate hashtry: f = PyFingerprint('/dev/ttyUSB0', 57600, 0xFFFFFFFF, 0x00000000)if ( f.verifyPassword() == False ):    raise ValueError('The given fingerprint sensor password is wrong!')except Exception as e:lcd.lcd_display_string('Initialization failed!', 2)print('Exception message: ' + str(e))exit(1)## Gets some sensor informationprint('Currently used templates: ' + str(f.getTemplateCount()) +'/'+ str(f.getStorageCapacity()))## Tries to search the finger and calculate hashtry:lcd.lcd_display_string(' Waiting for finger', 2)## Wait that finger is readwhile ( f.readImage() == False ):    pass## Converts read image to characteristics and stores it in charbuffer 1f.convertImage(0x01)## Searchs templateresult = f.searchTemplate()positionNumber = result[0]accuracyScore = result[1] if ( positionNumber == -1 ):    os.system('python access_denied.py')    exit(0) else:    lcd.lcd_clear()    lcd.lcd_display_string("  Finger accepted!", 2)    sleep(1.5)    lcd.lcd_clear()    os.system('python keypad.py')