ValueError: The view button.view.output didn't return an HttpResponse object. It returned None instead.

[twinklekaur]

Sir,

Thank you so much for the tutorial. But I have an issue.
Went I click on the submit button the following error occures:

Internal Server Error: /output/
Traceback (most recent call last):
File "C:\Users\Dell\Envs\mywebsite\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\Dell\Envs\mywebsite\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
"returned None instead." % (callback.module, view_name)
ValueError: The view button.view.output didn't return an HttpResponse object. It returned None instead.
[02/Jun/2019 15:16:05] "GET /output/ HTTP/1.1" 500 55771

Here is my view.py:

view.txt