Python/Django: I need some code to run between requests, which concept to look for?

I am trying Django for my project, which contains server-side code, which should work between requests. It should be initialized at server start, keep state, and polled sometimes between HTTP requests.

I can write own server with python http.server but it seems overkill at the moment, simple (Django built-in HTTP) server is ok for my project for now. Which is the simplest way to implement server-side code for typical Django project?

Edit: So I am looking for something like this:

# my_serverside_module.py

# keep during server lifetime
state = [] 

# called at server start
def init_module(): pass 

# called by framework 1 time per minute
def poll(): pass 

# called by myself during http request from Django code
def do_something(): pass

from Python/Django: I need some code to run between requests, which concept to look for?