「def sleeper」的語法無效

Question

我正在研究涉及Raspberry Pi上的舵機的小型項目。 我希望舵機運行x時間然後停止。正在嘗試我的代碼，並且目前在"def sleeper"上獲取無效語法，不知道爲什麼。

同樣是Stackoverflow的新手，我有一些縮進代碼的問題，我的道歉！

import RPi.GPIO as GPIO 

import time 

GPIO.setmode(GPIO.BOARD) 

GPIO.setup(7,GPIO.OUT) 

try: 
       while True: 
         GPIO.output(7,1) 
         time.sleep(0.0015) 
         GPIO.output(7,0) 




def sleeper(): 
    while True: 

     num = input('How long to wait: ') 

     try: 
      num = float(num) 
     except ValueError: 
      print('Please enter in a number.\n') 
      continue 

     print('Before: %s' % time.ctime()) 
     time.sleep(num) 
     print('After: %s\n' % time.ctime()) 


try: 
    sleeper() 
except KeyboardInterrupt: 
    print('\n\nKeyboard exception received. Exiting.') 
    exit() 

Answer 1

那是因爲你沒有寫任何except塊第一try ... except對：

這可能工作，只要你想：

import RPi.GPIO as GPIO 

import time 

GPIO.setmode(GPIO.BOARD) 

GPIO.setup(7,GPIO.OUT) 

try: 
    while True: 
     GPIO.output(7,1) 
     time.sleep(0.0015) 
     GPIO.output(7,0) 
except: 
    pass 

def sleeper(): 
    while True: 
     num = input('How long to wait: ') 
     try: 
      num = float(num) 
     except ValueError: 
      print('Please enter in a number.\n') 
      continue 

    print('Before: %s' % time.ctime()) 
    time.sleep(num) 
    print('After: %s\n' % time.ctime()) 

try: 
    sleeper() 
except KeyboardInterrupt: 
    print('\n\nKeyboard exception received. Exiting.') 
    exit() 

檢查壓痕請。