Python 2.7.9在运行脚本时无法终止子进程

Question

I want to run strandtest.py after running test.py for 5 sec. When I get an input from my remote strandtest.py has to stop so I can go on in the menu again. it's like a screensaver in windows. I can start a subprocess after 5 sec. but when it runs i can't stop it. I tried p.kill() and p.terminate() but they both won't work.

os.killpg(os.getpgid(p.pid), signal.SIGTERM)

gives

module' object has no attribute 'pid'

Can you help me?

Here's my code

import lirc
import time
import os
import signal
from subprocess import PIPE,Popen
import subprocess
from neopixel import *

Volume = 60
mute = False
bool = False
bool2 = False
LEDS = 100
PIN = 18
BRIGHTNESS = 255
R     = 255
G     = 255
B     = 255
LED_CHANNEL    = 0
LED_STRIP      = ws.WS2811_STRIP_GRB

sockid=lirc.init("lifetec", blocking = False)
strip = Adafruit_NeoPixel(10, PIN, 1050000, 10, False, BRIGHTNESS, LED_CHANNEL, LED_STRIP)
strip.begin()

def VolumeUp(procent, Bool):
    if Bool == False:
        if procent < 100: 
            Procent = procent + 4
            os.system('amixer -c 1 set Speaker ' + str(Procent) + '%')
            os.system('aplay /share/Wav/Menu/beep-22.wav')
            return Procent
        else:
            os.system('amixer -c 1 set Speaker ' + str(procent) + '%')
            os.system('aplay /share/Wav/Menu/button-3.wav')
    return procent

def VolumeDown(procent, Bool):
    if Bool == False:
        if procent > 0:
            Procent = procent - 4
            os.system('amixer -c 1 set Speaker ' + str(Procent) + '%')
            os.system('aplay /share/Wav/Menu/beep-22.wav')
            return Procent
    return procent

def Mute(Bool):
    print(str(Bool))
    os.system('aplay /share/Wav/Menu/beep-22.wav')
    os.system('amixer sset Speaker toggle')
    os.system('aplay /share/Wav/Menu/beep-23.wav')
    if Bool == False:
        Bool = True
    else:
        Bool = False
    print(str(Bool))
    return Bool

def wheel(pos):
    """Generate rainbow colors across 0-255 positions."""
    if pos < 85:
        return Color(pos * 3, 255 - pos * 3, 0)
    elif pos < 170:
        pos -= 85
        return Color(255 - pos * 3, 0, pos * 3)
    else:
        pos -= 170
        return Color(0, pos * 3, 255 - pos * 3)

def rainbow(strip, wait_ms=20, iterations=1):
        for j in range(256*iterations):
            print("JJJJ = " + str(j))
            for i in range(strip.numPixels()):
        strip.setPixelColor(i, wheel((i+j) & 255))
        strip.show()
        #time.sleep(0.01)
Gettime = True
pause = False

while True:
    if Gettime == True:
        timenow = time.time()
        print("timenow Gettime")
        print(timenow)
        Gettime = False

    if time.time() - timenow >= 5:
        if pause == False:
            print time.time() - timenow
            print("pause")
            bool = True
            pause = True
    if bool == True:
        p = subprocess.Popen('python strandtest.py', stdout=subprocess.PIPE, shell=True, preexec_fn=os.setsid)
        bool = False
    if bool2 == True:
        gelukt = os.killpg(os.getpgid(p.pid), signal.SIGTERM)
        Gettime = True
        print(gelukt)
        bool2 = False

    codeIR = lirc.nextcode()
    if codeIR != []:
        if codeIR[0] == "KEY_VOLUMEUP":
            print codeIR[0]
            print Volume
            Volume = VolumeUp(Volume, mute)
            print Volume
        if codeIR[0] == "KEY_VOLUMEDOWN":
            print codeIR[0]
            print Volume
            Volume = VolumeDown(Volume, mute)
            print Volume
        if codeIR[0] == "KEY_0":
            print codeIR[0]
            print Volume
            mute = Mute(mute)
            print Volume
        if codeIR[0] == "KEY_POWER":
            print codeIR[0]
            os.system("/share/RadVanAdvontuur.py 100 255 255 0")
        if codeIR[0] == "KEY_PAGEUP":
            print codeIR[0]
            bool2 = True
            pause = False
    if codeIR[0] == "KEY_PAGEDOWN":
            print codeIR[0]
            bool = True
            print "script running"

Answer 1

If you run it directly without a shell, like this:

p = subprocess.Popen('python strandtest.py', stdout=subprocess.PIPE, preexec_fn=os.setsid)

then you can use p.kill() or p.terminate() to end the process.