How to “stop” and “resume” long time running Python script?

Question

I wrote Python script that processes big number of large text files and may run a lot of time. Sometimes, there is a need to stop the running script and to

Answer 1

Here is something simple that hopefully can help you:

import time
import pickle


REGISTRY = None


def main(start=0):
    """Do some heavy work ..."""

    global REGISTRY

    a = start
    while 1:
        time.sleep(1)
        a += 1
        print a
        REGISTRY = pickle.dumps(a)


if __name__ == '__main__':
    print "To stop the script execution type CTRL-C"
    while 1:
       start = pickle.loads(REGISTRY) if REGISTRY else 0
        try:
            main(start=start)
        except KeyboardInterrupt:
            resume = raw_input('If you want to continue type the letter c:')
            if resume != 'c':
                break

Example of running:

$ python test.py
To stop the script execution type CTRL-C
1
2
3
^CIf you want to continue type the letter c:c
4
5
6
7
8
9
^CIf you want to continue type the letter c:
$ python test.py