Django server reload doesn't work for every .py file

Question

I'm starting the django server with python manage.py runserver

The output is following

Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).

In my django app I have a file named services.py and one is called schedules.py. When I make changes in the services.py file the reload works as expected, in schedules.py file changes do not lead to a server reload.

Why is that?

As a further information in my schedules.py file I have a schedule, which is not working:

from django_q.tasks import schedule


schedule('api.shared.tasks.send_order_reminder',
         schedule_type='I',
         repeats=-1)

Having the same code in the services.py file creates a schedule