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pythonjinja2

Get lengths of a list in a jinja2 template

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>
Solution 
  • <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")