Get lengths of a list in a jinja2 template

Question

How do I get the number of elements in a list in jinja2 template?

For example, in Python:

print(template.render(products=[???])) 

and in jinja2

<span>You have {{what goes here?}} products</span> 

Answer 1

<span>You have {{products|length}} products</span> 

You can also use this syntax in expressions like

{% if products|length > 1 %} 

jinja2's builtin filters are documented here; and specifically, as you've already found, length (and its synonym count) is documented to:

Return the number of items of a sequence or mapping.

So, again as you've found, {{products|count}} (or equivalently {{products|length}}) in your template will give the "number of products" ("length of list")

Answer 2

Alex' comment looks good but I was still confused with using range. The following worked for me while working on a for condition using length within range.

{% for i in range(0,(nums['list_users_response']['list_users_result']['users'])| length) %} <li>    {{ nums['list_users_response']['list_users_result']['users'][i]['user_name'] }} </li> {% endfor %}