How to increment a variable on a for loop in jinja template?

Question

I would like to do something like:

variable p is from test.py which is a list [\'a\',\'b\',\'c\',\'d\']

{% for i in p %}
{{variable++}}
{{variable}}
         


        

Answer 1

Here's my solution:

Put all the counters in a dictionary:

{% set counter = {
    'counter1': 0,
    'counter2': 0,
    'etc': 0,
    } %}

Define a macro to increment them easily:

{% macro increment(dct, key, inc=1)%}
    {% if dct.update({key: dct[key] + inc}) %} {% endif %}
{% endmacro %}

Now, whenever you want to increment the 'counter1' counter, just do:

{{ increment(counter, 'counter1') }}