django - messages

django_messages.py

# settings.py
MIDDLEWARE_CLASSES = (
    'django.contrib.messages.middleware.MessageMiddleware',
)

TEMPLATE_CONTEXT_PROCESSORS = (
    'django.contrib.messages.context_processors.messages',
)

INSTALLED_APPS = (
    'django.contrib.messages',
)

# in view.py
from django.contrib import messages
messages.add_message(request, messages.INFO, 'Hello world.')

# in template
{% if messages %}
<ul class="messages">
    {% for message in messages %}
    <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
    {% endfor %}
</ul>
{% endif %}