Check if an array is not empty in Jinja2

Question

I need to check if the variable texts is defined or not in index.html.

If the variable is defined and not empty then I should render the loop.

Answer 1

It's possible that texts could be defined but contain a single list element which is an empty string; For example:

texts = ['']

In this case, testing if texts is defined will produce a true result so you should test the first element instead:

{% if texts[0] != '' %}
    ..code here..
{% endif %}

You might also want to combine that with the |length filter to make sure it only has one element.