How to set block variable in view code?

I am struggling to understand block variables.  I have two block variables in my HTML template as follows:

<h2>

{% block side_hdr %}{% endblock%}

</h2>

{% block content %}{% endblock %}

How (if possible) do I set these variables in my class based view?

class TestView(TemplateView):

    template_name = "base.html"

Thanks.

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