text: import os
  
  from celery import Celery
  from celery.schedules import crontab
  
  # Set the default Django settings module for the 'celery' program.
  os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'delivery.settings')
  
  app = Celery('delivery')
  
  # Using a string here means the worker doesn't have to serialize
  # the configuration object to child processes.
  # - namespace='CELERY' means all celery-related configuration keys
  #   should have a `CELERY_` prefix.
  app.config_from_object('django.conf:settings', namespace='CELERY')
  
  # Load task modules from all registered Django apps.
  app.autodiscover_tasks()
  
  app.conf.beat_schedule = {
      # Executes every Monday morning at 7:30 a.m.
      'add-every-friday-midnight': {
          'task': 'salary.tasks.calculate_weekly_salary',
          'schedule': crontab(hour=0, minute=1, day_of_week='saturday'),
      },
  }
  