{% if dhfpuoashbjk is defined %}
<h1>Oh no!</h1>
{% else %}
<h1>Hello!</h1>
{% endif %}
{% if product is defined %}
<h1>Hello again!</h1>
{% else %}
<h1>Oh no!</h1>
{% endif %}
{% if blabla is undefined %}
Blabla
{% endif %}
{% if username is string %}
String
{% elif product is string %}
Wat
{% endif %}
{% if number_reviews + 1 is odd %}
Odd
{% elif number_reviews is odd %}
Nop
{% endif %}
{% if number_reviews is even %}
Even
{% elif number_reviews + 1 is even %}
Nop2
{% endif %}
{% if number_reviews is number %}
Number
{% elif product is number %}
Wat2
{% endif %}
{% if 10 is divisibleby 10 %}
Divisible
{% endif %}
{% if a_tuple is iterable %}
Iterable
{% elif reviews is iterable %}
Iterable2
{% endif %}