Basic template-tags and filters
As we've mentioned already, the template system ships with built-in tags and filters. The sections that follow provide a rundown of the most common tags and filters.
Tags
if/else
The {% if %} tag evaluates a variable, and if that variable is True (that is, it exists, is not empty, and is not a false Boolean value), the system will display everything between {% if %} and {% endif %}, for example:
{% if today_is_weekend %}
<p>Welcome to the weekend!</p>
{% endif %}
An {% else %} tag is optional:
{% if today_is_weekend %}
<p>Welcome to the weekend!</p>
{% else %}
<p>Get back to work.</p>
{% endif %}
The if tag may also take one or several {% elif %} clauses as well:
{% if athlete_list %} Number of athletes: {{ athlete_list|length ...Get Mastering Django: Core now with the O’Reilly learning platform.
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