Django execute block tag inside 'if' statement in template only if 'if' statement is true -

i want execute block tag if if statement true. here mean. template:

{% extends "homepagebase.html" %}  {% if not blogpage %}     {% block isblogfalse %} notblogpage {% endblock %} {% else %}     {% block isblogtrue %} blogpage {% endblock %} {% endif %} 

but both block tags executed. there way block tags executed if if / else statements true? way around issue or way of accomplishing task?

one answer problem can found @ https://stackoverflow.com/a/18638131/573392. modify situation, like:

{% extends blogpage|yesno:"blogpage.html,notblogpage.html" %} 

this solution allow load template dependent on blogpage variable, achieving outcome of if statement.