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}} 

result output is:
1 2 3 4

Answer 1

You could use loop.index:

{% for i in p %}   {{ loop.index }} {% endfor %} 

Check the template designer documentation.

In more recent versions, due to scoping rules, the following would not work:

{% set count = 1 %} {% for i in p %}   {{ count }}   {% set count = count + 1 %} {% endfor %}