python如何停止無限循環並繼續執行其餘代碼？

Question

問題是我不能在不停止整個程序的情況下退出while循環。

當我在Raspberry Pi上執行代碼時，相機開始記錄，但是當我想結束視頻並按下Ctrl + c時，整個程序停止，而不是在while循環後繼續。我認爲信號處理器會捕獲鍵盤中斷，但它不會。

我的代碼：

import picamera 
import signal 
from time import sleep 
from subprocess import call 

def signal_handler(signal, frame): 
     global interrupted 
     interrupted = True 

signal.signal(signal.SIGINT, signal_handler) 

interrupted = False 

# Setup the camera 
with picamera.PiCamera() as camera: 
    camera.resolution = (1640, 922) 
    camera.framerate = 30 

    # Start recording 
    camera.start_recording("pythonVideo.h264") 

while True: 
     sleep(0.5) 
     print("still recording") 

     if interrupted: 
       print("Ctrl+C pressed") 
       camera.stop_recording() 
       break 

# Stop recording 
#camera.stop_recording() 

# The camera is now closed. 

print("We are going to convert the video.") 
# Define the command we want to execute. 
command = "MP4Box -add pythonVideo.h264 convertedVideo.mp4 -fps 30" 
#Execute command. 
call([command], shell=True) 
# Video converted. 
print("Video converted.") 

我試了一下：

bflag = True 
while bflag ==True: 
     sleep(0.5) 
     print("still recording") 

     if interrupted: 
       print("Ctrl+C pressed") 
       camera.stop_recording() 
       bflag = False 

錯誤：

pi@raspberrypi:~/Documents/useThisFolder $ python cookieVideo.py 
still recording 
still recording 
still recording 
still recording 
still recording 
^Cstill recording 
Ctrl+C pressed 
Traceback (most recent call last): 
    File "cookieVideo.py", line 29, in <module> 
    camera.stop_recording() 
    File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 1193, in stop_recording 
'port %d' % splitter_port) 
picamera.exc.PiCameraNotRecording: There is no recording in progress on port 1 

Answer 1

這將做到這一點：

while True: 
    try: 
     sleep(0.5) 
     print("still recording") 
    except KeyboardInterrupt: 
     print("Ctrl+C pressed") 
     camera.stop_recording() 
     break 

Answer 2

正如你可以看到它與@ mdurant的代碼一樣完美。