Python script to do a process as a daemon.

test_daemon.py

#!/usr/local/bin/python3.6

import datetime
import sys
import traceback
from daemon import DaemonContext
from os     import path
from time   import sleep
from lockfile.pidlockfile import PIDLockFile


class TestDaemon:
    def __init__(self):
        self.basename = path.splitext(path.basename(__file__))[0]
        self.work_dir = path.dirname(path.abspath(__file__))

    def exec(self):
        try:
            dc = DaemonContext(
                working_directory = self.work_dir,
                pidfile = PIDLockFile("/tmp/{}.pid".format(self.basename)),
                stderr = open("{}.err".format(self.basename), "a+")
            )
            with dc:
                self.__do_process()
        except Exception as e:
            raise

    def __do_process(self):
        try:
            while True:
                with open("{}.txt".format(self.basename), "a") as f:
                    f.write(datetime.datetime.now().isoformat() + "\n")
                sleep(10)
        except Exception as e:
            raise

if __name__ == '__main__':
    try:
        obj = TestDaemon()
        obj.exec()
    except Exception as e:
        traceback.print_exc()
        sys.exit(1)