How to display error or success in django

from django.contrib import messages

messages.success(request, "login success.")
or
messages.warning(request, "Please enter Valid Username and Password.")


write below code in template

{% if messages %}
                    {% for message in messages %}
                        <div class="alert alert-success">
                            <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
                                <strong> {{ message|escape }}</strong>
                            </div>
                    {% endfor %}
                {% endif %}