[Python] What is the correct way of using Django's get_context_data() method to add key-value...

How can Django's get_context_data() method be used to add new key-value pairs to a context in the views.py file? I am following along with a tutorial and thus far everything has worked well, however at the moment I can't get the added context entries to populate the html template. Here's what I've got thus far, based on the instructions in the tutorial:

views.py:

from django.shortcuts import render
from django.views.generic import TemplateView

# Create your views here.
def home_page_view(request):
context = {
"inventory_list": ["Widget 1", "Widget 2", "Widget 3"],
"greeting": "THanK yOu foR viSitiNG!",
}
return render(request, "home.html", context)

class AboutPageView(TemplateView):
template_name = "about.html"

def get_context_data(self, **kwargs): # new
context = super().get_context_data(**kwargs)
context["contact_address"] = "123 Jones Street"
context["phone_number"] = "01234 678910"
return context


about.html (the template):

<h1>Company About Page</h1>
<p>The company address is {{contact_address}}.</p>
<p>The company phone number is {{phone_number}}.</p>


urls.py:

from django.urls import path
from .views import home_page_view, AboutPageView

urlpatterns = [
path("about/", AboutPageView.as_view()),
path("", home_page_view)
]


This results in an output which doesn't drag through the values associated contact_address and phone_number to the website when I run the dev server:



What I am doing wrong? I've double-checked the sample code several times, and can't see that I'm mis-typing anything. I've also browsed for solutions online but many of the responses seem to relate to scenarios that are a bit far ahead of my beginner-level understanding. I've only been dealing with Django for a week, so I'm prepared to accept that I might be missing something quite elementary.

I'm running Django 5.0.13 with Python 3.12.1, on a Windows 11.

Thanks in advance.

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