Looping over subset in Jinja

Question

Jinja allows me to do

{% for item in all_items %}
    {{ item }}
{% endfor %}

but I'd like to be able to only take the first n items; in Python that would be

for item in all_items[:n]:

Is there any elegant way to do this in Jinja, except

{% for item in all_items %}
    {% if loop.index <= n %}
        {{ item }}
    {% endif %}
{% endfor %}

score 27 · Accepted Answer · edited Mar 07 '12 at 23:14

27

You can use normal python slice syntax.

>>> import jinja2
>>> t = jinja2.Template("{% for i in items[:3] %}{{ i }}\n{% endfor %}")
>>> items = range(10)
>>> print(t.render(items=items))
0
1
2

edited Mar 07 '12 at 23:14

jcollado

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answered Mar 07 '12 at 23:03

miku

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3

As often in life, we sometimes fail to see the most obvious. Thanks :) – Manuel Ebert Mar 11 '12 at 16:56
@miku, how to get last 3 item? – Syed Oct 19 '16 at 11:36
@miku, no worries, I got it over here [-3:] http://stackoverflow.com/a/646654/1292050 – Syed Oct 19 '16 at 12:02

Looping over subset in Jinja

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