Django templates: False vs. None

Question

How can I distinguish between None and False in django templates?

{% if x %}
True 
{% else %}
None and False - how can I split this case?
{% endif %}

Answer 1

Every Django template context contains True, False and None. For Django 1.10 and later, you can do the following:

{% if x %}
True 
{% elif x is None %}
None
{% else %}
False (or empty string, empty list etc)
{% endif %}

Django 1.9 and earlier do not support the is operator in the if tag. Most of the time, it is ok to use {% if x == None %} instead.

{% if x %}
True 
{% elif x == None %}
None
{% else %}
False (or empty string, empty list etc)
{% endif %}

With Django 1.4 and earlier, you do not have access to True, False and None in the template context, You can use the yesno filter instead.

In the view:

x = True
y = False
z = None

In the template:

{{ x|yesno:"true,false,none" }}
{{ y|yesno:"true,false,none" }}    
{{ z|yesno:"true,false,none" }}    

Result:

true
false
none