Python script to run a command every 2 seconds. I use it for unit tests

intrun

#!/usr/bin/env python2
#
# This script will run something every 2 seconds and print a line in between
#
# Usage: intrun command

from subprocess import call
from sys import argv, exit
from time import sleep


def show_help():
    print "Command to run is missing!\n\tUsage %s command\n" % argv[0]


def validate_input():
    if len(argv) != 2:
        return False
    return True


def get_command():
    return argv[1]


def print_line():
    print "\n"
    print "-" * 120
    print "\n"


def main():
    if not validate_input():
        show_help()
        return 1

    command = get_command()

    while True:
        try:
            call(command)
            print_line()
            sleep(2)
        except KeyboardInterrupt:
            return 0
        except OSError:
            print "Command '%s' not found\n" % command
            return 2


if __name__ == "__main__":
    exit(main())