CODEWITHSUNDEEP
pythongoogle-app-enginejinja2
Shan
Shan

Reputation: 1138

Incrementing list items in jinja2 templates (appengine)

I have a list of values in my template, which I need to increment based on some conditions. Something like this:

{% set samplelist=[0,0,0] %}

{% if condition %}
<p>some text</p>
{% set samplelist[0]=samplelist[0]+listpassedbymainfile[0] %}
{% endif %}

I keep getting this error when I try to run the above code:

TemplateSyntaxError: expected token '=', got '['

Is this not supported, if so, is there a work around ?

Upvotes: 1

Views: 359

Answers (1)

SingleNegationElimination
SingleNegationElimination

Reputation: 156158

Indeed, you can't use jinja in the same way as you would use python. You can, however, unroll your in-place modification with a proper assignment. Note that your list will now be the same from the first element on, but with a different value in its first slot. We can change the assignment to capture the full, new state of samplelist in that way:

{% set samplelist = [samplelist[0] + listpassedbymainfile[0]] + samplelist[1:] %}

Upvotes: 4

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