Execute other python script when django server is started

Question

I have a Django project and other python script which is a ZMQ socket which continuously listens for message to perform some operation, ZMQ server script is an independent script which for now runs as python zmq_server.py in a terminal or cmd.

What I am trying to do is start the ZMQ server script when python manage.py runserver is called to start the django server.

I did some digging but found nothing related to this, is it possible to do something like this?

You could try putting import zmq_server in your settings or views and see if that does it — Rob Kwasowski
– Rob Kwasowski, Commented Jan 5, 2020 at 23:57
It is executing when I put it in settings.py, but I have to create a seperate thread or async process to execute that zmq_server script. will it be any issue if it is a seperate thread? — Vatsal Chavda
– Vatsal Chavda, Commented Jan 6, 2020 at 0:45
It works. It looks fine as it is working as expected. Thanks rob. — Vatsal Chavda
– Vatsal Chavda, Commented Jan 6, 2020 at 0:51

Rob Kwasowski · Accepted Answer · 2020-01-06 00:53:16Z

2

You can run any script when your Django server starts by importing it in your settings.py at the top like this:

import zmq_server

Normally that's what you'd do for a script you're going to use in your project, but if you just want it to get executed you can do it like that as well.

answered Jan 6, 2020 at 0:53

Rob Kwasowski

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4 Comments

Vatsal Chavda Over a year ago

You are technically correct but settings.py gets executed twice, so my zmq_server throws an error that address already in use because it tries to bind the socket twice. Is there any other way to execute my server only once?

funnydman Over a year ago

@VatsalChavda could you use sys.modules to get a list of already imported modules?

Rob Kwasowski Over a year ago

@VatsalChavda Have you tried putting the import statement in your views?

Rob Kwasowski Over a year ago

@VatsalChavda In my project the settings.py only gets loaded once, but I have seen it get loaded twice. It may be that you are importing your settings.py somewhere else in your project

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