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template.html

views.py

<!DOCTYPE html>
<html>
<body>

<h1>Hello {{ firstname }}, how are you?</h1>

<p>In views.py you can see how to create the variable.</p>
<p>In template.html you can see how to use the variable.</p>

</body>
</html>

from django.http import HttpResponse
from django.template import loader

def testing(request):
  template = loader.get_template('template.html')
  context = {
    'firstname': 'Linus',
  }
  return HttpResponse(template.render(context, request))