check for presence in a list django template

I don’t think that you can define a list directly in the template. You could pass a list to the template and do

{% if value in my_list %}

For example:

{% if name in 'foo,bar' %}
    bla
{% endif %}

Alternatively, you could write a template tag which takes parameters like this:

{% ifinlist value "val1,val2,val3" %}