{% block body %}

MyApp

{% if call_or_get(current_user.is_authenticated) %} {{ current_user.username }}   |   Sign out {% else %} Sign in {% endif %}
{% block menu %} {% endblock %}
{# One-time system messages called Flash messages #} {% block flash_messages %} {%- with messages = get_flashed_messages(with_categories=true) -%} {% if messages %} {% for category, message in messages %} {% if category=='error' %} {% set category='danger' %} {% endif %}
{{ message|safe }}
{% endfor %} {% endif %} {%- endwith %} {% endblock %} {% block main %}{% block content %}{% endblock %}{% endblock %}

{% endblock %}