From https://docs.djangoproject.com/en/1.5/ref/contrib/messages/

messages_framework.py

from django.contrib import messages

messages.add_message(request, messages.INFO, 'Hello world.')

# Shortcut way to add messages
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.')

messages_template.html

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

The bootstrap way:

{% for message in messages %}
    <div class="alert alert-{{ message.tags }}">{{ message }}<a class="close" data-dismiss="alert" href="#">&times;</a></div>
{% endfor %}