Python script ends instead of restarting (os.execv)

Question

Whenever I run the following file (and main encounters the WebDriverException exception) my program ends instead of restarting. Would anyone know why that's happening? Any help would be greatly appreciated – thank you.

from uploadToBeatstars import main
from selenium.common.exceptions import WebDriverException

try:
    main()
except WebDriverException:
    print("Dumb target error happened. Restarting program.")
    from uploadToBeatstars import driver
    driver.close()
    import sys
    import os
    os.execv(sys.executable, ['python'] + sys.argv)

@AnthonySottile Yes I'm on windows and no there's no output. It just prints out the print statement, stalls for like 5 seconds, then the program just stops running. — THEMOUNTAINSANDTHESKIES
– THEMOUNTAINSANDTHESKIES, Commented May 22, 2022 at 16:44
And is there any reason to respawn python interpreter instead of just main() in a while loop? — STerliakov
– STerliakov, Commented May 22, 2022 at 17:16
@SUTerliakov No there isn't any reason why I couldn't do something like that. How would that look like? — THEMOUNTAINSANDTHESKIES
– THEMOUNTAINSANDTHESKIES, Commented May 22, 2022 at 17:21

STerliakov · Accepted Answer · 2022-05-22 17:29:05Z

1

You don't need to respawn the interpreter after a failure in general, just retry in a loop:

from uploadToBeatstars import main, driver
from selenium.common.exceptions import WebDriverException

while True:
    try:
        main()
    except WebDriverException:
        print("Dumb target error happened. Restarting program.")
        driver.close()  # Not sure if it is needed, can driver be alive after an exception?
        # Try again
    else:
        break  # Stop if no exception occurred.

answered May 22, 2022 at 17:29

STerliakov

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Comments

anthony sottile · Accepted Answer · 2022-05-22 18:00:47Z

on windows, the os.exec* family of functions do not operate as they do on posixlikes -- instead of replacing the current process, they spawn a new one in the background and os._exit(1)

more on this here: https://github.com/python/cpython/issues/53394

on Windows, exec() does not really replace the current process. It creates a new process (with a new pid), and exits the current one.

you're probably best to either write a loop or use some sort of process manager

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