Why can't access the parent variable in the class?

Question

Django

Good afternoon, for example, we have such a CBV

class Post_Detail(TemplateView):
    template_name = 'blog/post_detail.html'

Why can't I access template_name but can only override it? Why is it like this

class Post_Detail(TemplateView):
    template_name = super().template_name

can't get through to her? How to contact the parent?
PS super without parameters, we mean that we have the 3rd version of python, it also does not work with parameters

Answer 1

There is a get_template_names method where you can get the current template_name by self.template_name. Override this method.
Example:

class CategoryView(TemplateView):
    template_folder = 'build'
    template_name = 'build/category.html'
    ...
    def get_template_names(self):
        template = self.template_name
        category_template = '{folder}/{slug}/category.html'.format(folder=self.template_folder, slug=self.category.slug)
        return [category_template, template]
    ...

Answer 2

1) TemplateView doesn't have template_name variable defined
2) Do it in a method.

class A(object):
    x = 5

class B(A):
    x = 6
    def foo(self):
        return super().x  # вернёт 5

Answer 3

self.template_name