You can either use the regular Django Form framework, or you can just regular HTML forms and have it POST to a specific URL, and on the Django side you would configure urls.py to have a proper handler for that URL, and you would get the POST variables there.
Using the above, you would gain access to the POST variables on the Python side (in Django), and would be able to modify them. For debugging, you can either use logging (and it will go to django_service.log in var/logs/splunk), or you can attach a Python debugger (e.g. from PyCharm) to the Python application.
You would use regular Django templates here - you would have any variables on the Python side, and would just give it to the template and render them.
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