subprocess can't successfully restart the targeted python file

问题

I write a program my_test.py to get data from web and store to mysql. But the program my_test.py collapses a lot (my bad programming skill...) and I try to monitor its status and restart it when it collapses. I use subprocess modular with the following codes.

import subprocess
import time
p = subprocess.Popen(['python.exe', r'D:\my_test.py'], shell=True)
while True:
    try:
        stopped = p.poll()
    except:
        stopped = True
    if stopped:
        p = subprocess.Popen(['python.exe', r'D:\my_test.py'], shell=True)
    time.sleep(60)

But when my_test.py collapses, a windows warning window jumps out to alert me that my_test.py is down and which action I will choose: stop, debug ... Something like that. And my_test.py seems frozen by the alert windows and the codes above can't restart it successfully. Only when I manually close the window by choose 'close', it will restart again.

It there any solution to this problem such that my codes can successfully restart my_test.py when it breaks down?

Sorry for the inconvinience brought by my poor English and thank in advance for your kind advices.

回答1:

There are two parts in your question:

what to do with the debug dialog. You could try this: How do I disable the 'Debug / Close Application' dialog on Windows Vista?
how to restart the script automatically

How to restart

The priority order:

fix my_test.py, to avoid crashing due to known issues
use a supervisor program to run your script such as upstart or supervisord -- they can restart it automatically if it crashes
write your own supervisor program with its own bugs that you have to maintain

It is best to limit yourself to options 1 and/or 2 if you can find an already-written supervisor program that works on Windows (upstart and supervisord do not work on Windows).

Your current supervisor script could be improved to avoid waiting a minute before restarting the program after it crashes if it has been running more than a minute already:

#!/usr/bin/env python3
import sys
import subprocess
import time
try:
    from time import monotonic as timer
except ImportError:
    from time import time as timer # time() can be set back

while True:
    earliest_next_start = timer() + 60
    subprocess.call([sys.executable, r'D:\my_test.py'])
    while timer() < earliest_next_start:
        time.sleep(max(0, earliest_next_start - timer()))

来源：https://stackoverflow.com/questions/28302081/subprocess-cant-successfully-restart-the-targeted-python-file

标签

python

windows

subprocess

restart