Лучше использовать функционал шаблонов
proj/
└── templates
├── base.html
└── news.html
base
{% load staticfiles %}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="{% static main.css %}">
{% block additional_media1 %}{% endblock %}
{% block additional_media2 %}
<link rel="stylesheet" href="{% static else.css %}">
{% endblock %}
</head>
<body>
{% block body1 %}{% endblock %}
{% block body2 %}{% endblock %}
</body>
</html>
news
{% extends "base.html" %}
{% load staticfiles %}
{% block additional_media1 %}
<link rel="stylesheet" href="{% static news.css %}">
{% endblock %}
{% block additional_media2 %}
{{ block.super }}
<link rel="stylesheet" href="{% static else2.css %}">
{% endblock %}
{% block body1 %}lorem{% endblock %}
{% block body2 %}ipsum{% endblock %}
