CODEWITHSUNDEEP
pythontime
Benjamin
Benjamin

Reputation: 315

Log the time a python script stopped?

I want to log (into a txt file) the time a Python script stopped. The issue with this is regarding to logic:

If it stopped, it must know when it did - but if it's closed, how can it know? It'd have to be aware of the closing about 1 second ago before it happens. Which led me to the next phase:

A watchdog for the process "python.exe", but that won't work because of the context I want to use it in: I want to know when my computer shuts down via a Python script.

The purpose of this is to log the shutdowns (sleeps) and restarts / wake ups of the computer (Event Viewer doesn't seem to log all of them so I said, hey, why not do it this way?)

Upvotes: 2

Views: 637

Answers (2)

Aaron Hall
Aaron Hall

Reputation: 395603

Anything in a finally block is guaranteed to run, so you can do this, so long as you don't catch SystemExit or BaseException and this gets a shutdown signal or keyboard interrupt:

import logging
import time

logger = logging.getlogger(__name__)

def process():
    '''this can be anything, sleep is probably least resource consumptive'''
    while 1:
        time.sleep(5)

def main():
    try:
        process()
    finally: # guaranteed to run, so long as Python gets an error, 
             # shutdown signal or keyboard interrupt.
        logger.info('shutdown at {0}'.format(datetime.datetime.now()))

if __name__ == '__main__':
    main()

Upvotes: 1

bosnjak
bosnjak

Reputation: 8624

For regular terminations, I would suggest using the atexit module: https://docs.python.org/2/library/atexit.html

You can write the time of termination of your script like this:

import datetime
import atexit

def leaving():
   open("my.log", "w").write("I was closed at %s" % datetime.datetime.now())

atexit.register(leaving)

Another way would be to use decorators, like this:

import atexit

@atexit.register
def leaving():
    import datetime
    open("my.log", "w").write("I was closed at %s" % datetime.datetime.now())

Upvotes: 3

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