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Since you are hosting on Heroku, you shouldn’t manually create file on your server to store the SECRET_KEY, since it will be deleted on server restart. I would use Heroku environment variables, which can be set from your command line:
heroku config:set SECRET_KEY=some_very_secret_key
You can then easily read it in your Django settings:
os.environ['SECRET_KEY']
For more details see: https://devcenter.heroku.com/articles/config-vars
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