Python daemon shows no output for an error

Question

I read How do you create a daemon in Python? and also this topic, and tried to write a very simple daemon :

import daemon
import time
with daemon.DaemonContext():
    while True:
        with open('a.txt', 'a') as f:
            f.write('Hi')
        time.sleep(2)

Doing python script.py works and returns immediately to terminal (that's the expected behaviour). But a.txt is never written and I don't get any error message. What's wrong with this simple daemon?

Answer 1

daemon.DaemonContext() has option working_directory that has default fault value / i.e. your program probably doesn't have permission to create a new file there.