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You’re looking for Django’s Messaging Framework.
Here’s some code from the docs:
from django.contrib import messages
messages.add_message(request, messages.INFO, 'Hello world.')
# Shortcut methods
messages.debug(request, '%s SQL statements were executed.' % count)
messages.info(request, 'Three credits remain in your account.')
messages.success(request, 'Profile details updated.')
messages.warning(request, 'Your account expires in three days.')
messages.error(request, 'Document deleted.')
Source:stackexchange.com