How to do it...

Follow these steps to create and use the app configuration:

1. Create the apps.py file and put the following content in it, as follows:

# magazine/apps.py
from django.apps import AppConfig
from django.utils.translation import ugettext_lazy as _


class MagazineAppConfig(AppConfig):
    name = "magazine"
    verbose_name = _("Magazine")

    def ready(self):
        from . import signals

1. Edit the __init__.py file in the magazine module to contain the following content:

# magazine/__init__.py
default_app_config = "magazine.apps.MagazineAppConfig"

1. Let's create a signals.py file and add some signal handlers there:

# magazine/signals.py
from django.db.models.signals import post_save, post_delete
from django.dispatch import receiver
from django.conf import settings

from .models import NewsArticle


@receiver(post_save, sender=NewsArticle)
def news_save_handler(sender, **kwargs):
    if settings.DEBUG:
        print(f"{kwargs['instance']} saved.")


@receiver(post_delete, sender=NewsArticle)
def news_delete_handler(sender, **kwargs):
    if settings.DEBUG:
        print(f"{kwargs['instance']} deleted.")