[Django]-Check if key exists in a Python dict in Jinja2 templates

You can test for key definition this way:

{% if settings.property is defined %}

#...
{% endif %}

This works fine doesn’t work in cases involving dictionaries. In those cases, please see the answer by tshalif.
Otherwise, with SaltStack (for example), you will get this error:

Unable to manage file: Jinja variable 'dict object' has no attribute '[attributeName]'

if you use this approach:

{% if settings.myProperty %}

note:

Will also skip, if settings.myProperty exists, but is evaluated as False (e.g. settings.myProperty = 0).

Actually, in the style of Python, if you do a simple if statement, it will work:

{% if settings.foo %}
Setting Foo: {{ settings.foo }}
{% endif %}
{% if settings.bar %}
Setting Bar: {{ settings.bar }}
{% endif %}
{% if settings.hello %}
Setting Hello: {{ settings.hello }}
{% endif %}

Output:

Setting Foo: baz
Setting Hello: world

Cheers!