old_contents: from __future__ import absolute_import
  
  import os
  
  from celery import Celery
  
  ## set the default Django settings module for the 'celery' program.
  os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'toolkit.settings')
  
  from django.conf import settings
  
  app = Celery('toolkit')
  
  # Using a string here means the worker will not have to
  # pickle the object when using Windows.
  app.config_from_object('django.conf:settings')
  app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
  
  app.conf.update(
      CELERY_RESULT_BACKEND='djcelery.backends.database:DatabaseBackend',
      BROKER_URL = 'django://',)
  
new_contents: from __future__ import absolute_import
  
  import os
  
  from celery import Celery
  
  ## set the default Django settings module for the 'celery' program.
  os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'toolkit.settings')
  
  from django.conf import settings
  
  app = Celery('toolkit')
  
  # Using a string here means the worker will not have to
  # pickle the object when using Windows.
  app.config_from_object('django.conf:settings')
  app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
  
  app.conf.update(
      CELERY_RESULT_BACKEND='djcelery.backends.database:DatabaseBackend',
      BROKER_URL = 'django://',
      # Configure to not use 'pickle' serialisation (which is deprecated):
      CELERY_ACCEPT_CONTENT=['json', 'msgpack', 'yaml'],
      CELERY_TASK_SERIALIZER = 'json',
      CELERY_RESULT_SERIALIZER = 'json',)
  
subject: Use JSON (not pickle) for celery serialisation