How can I check the size of a collection within a Django template?

Question

I have a list in my Django template. I want to do something only if the size of the list is greater than zero.

I have tried myList|length and m

Answer 1

See https://docs.djangoproject.com/en/stable/ref/templates/builtins/#if : just use, to reproduce their example:

{% if athlete_list %}
    Number of athletes: {{ athlete_list|length }}
{% else %}
    No athletes.
{% endif %}