CODEWITHSUNDEEP
pythonwindows
Cisplatin
Cisplatin

Reputation: 2998

How to open another program upon exiting the program in Python?

I have a program that requires some cleaning up after exiting, and have written a seperate .py file for this. However, the program I use stays in an infinite loop at one part:

pythoncom.PumpMessages()

Because of this, there is no "natural" closing of the program. The only way is to end the process from task manager.

So I ask: is there a way to, upon being ended from task manager, to run my clean up python script automatically?

Edit: I could put it in an infinite loop in a different way, such as this, if it helps:

while True:
    pythoncom.PumpWaitingMessages()

Upvotes: 1

Views: 244

Answers (3)

eri
eri

Reputation: 3514

There is sample from my project:

import signal

def term(*args,**kwargs):
    sys.stderr.write('\nStopping...')
    do_cleaning_stuff_here()

signal.signal(signal.SIGTERM, term)
signal.signal(signal.SIGINT, term)
signal.signal(signal.SIGQUIT, term)
yuor_main_code_here()

With infinite loop:

import signal

def term(*args,**kwargs):
    global running
    sys.stderr.write('\nStopping...')
    running=False

signal.signal(signal.SIGTERM, term)
signal.signal(signal.SIGINT, term)
signal.signal(signal.SIGQUIT, term)
running=True
while running:
    handle()
cleanup()

windows signals translated to unix equivalent.

Upvotes: 3

sihrc
sihrc

Reputation: 2828

You can run both scripts from a separate python script and kill the first process before running the second.

For example using subprocess.Popen:

 proc1 = subprocess.Popen(cmd, shell = True)
 time.sleep(waititme) #or other flag, such as reading another source
 proc1.kill() 
 proc2 = subprocess.Popen(cmd2, shell = True)

Upvotes: 3

Jonathan
Jonathan

Reputation: 5864

In unix, when you kill a process, you send it a signal. For example, CTRL-C causes a signal sent to the program.

On windows, some of these signals are emulated, including CTRL-C. If your loop isn't calling functions that block the CTRL-C signal, then you can press CTRL-C to kill the loop. Could you try terminating your program with CTRL-C instead of doing it through the task manager?

If it works that way, you can write a handler to catch the CTRL-C signal, cleanup the program state, and sys.exit().

Here is code to capture the signal: How do I capture SIGINT in Python?

Upvotes: 1

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