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copied!<p>Rather than writing your own daemon, use <a href="http://pypi.python.org/pypi/python-daemon" rel="noreferrer">python-daemon</a> instead! <a href="http://pypi.python.org/pypi/python-daemon" rel="noreferrer">python-daemon</a> implements the well-behaved daemon specification of <a href="http://python.org/dev/peps/pep-3143" rel="noreferrer">PEP 3143</a>, "Standard daemon process library". </p> <p>I have included example code based on the accepted answer to this question, and even though the code looks almost identical, it has an important fundamental difference. Without <a href="http://pypi.python.org/pypi/python-daemon" rel="noreferrer">python-daemon</a> you would have to use <code>&</code> to put your process in the background and <code>nohup</code> and to keep your process from getting killed when you exit your shell. Instead this will automatically detach from your terminal when you run the program.</p> <p>For example:</p> <pre><code>import daemon import time def do_something(): while True: with open("/tmp/current_time.txt", "w") as f: f.write("The time is now " + time.ctime()) time.sleep(5) def run(): with daemon.DaemonContext(): do_something() if __name__ == "__main__": run() </code></pre> <p>To actually run it:</p> <pre><code>python background_test.py </code></pre> <p>And note the absence of <code>&</code> here.</p> <p>Also, <a href="https://stackoverflow.com/questions/473620/how-do-you-create-a-daemon-in-python">this other stackoverflow answer</a> explains in detail the many benefits of using <a href="http://pypi.python.org/pypi/python-daemon" rel="noreferrer">python-daemon</a>.</p>

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