Environment Variables for Django Secret Key etc On Windows 10 and Heroku

I tried to put my Django Secret Key in Environment Variables.

SECRET_KEY = os.environ.get('SECRET_KEY')

I did save the SECRET_KEY on env var windows 10 like this

When I tried to py manage.py runserver, I got this error

django.core.exceptions.ImproperlyConfigured: The SECRET_KEY setting must not be empty.

I followed this 

https://stackoverflow.com/questions/19681102/my-django-secret-key-is-in-an-environment-variable-but-i-cant-do-syncdb

But no idea with the solution..

At this point, strange thing even occurred, I tried to py manage.py without any SECRET_KEY on my Env Var on windows 10, and just leaving 

  SECRET_KEY = os.environ.get('SECRET_KEY') 

in my settings.py.

I got no error.

Strange.. But when I deployed it on heroku, it says the same error like this 

django.core.exceptions.ImproperlyConfigured: The SECRET_KEY setting must not be empty. 

Is anyone here experienced the same stuck like me? Please kindly advise. Thanks 

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