HttpRequest instance add attribute dynamically in Django?

I'm confused with HttpRequest object in Django. I know that the AuthenticationMiddleware will add a user to request which is an instance of HttpRequest. And the code is here, but what I want to show is as follow:

request.user = SimpleLazyObject(lambda: get_user(request))

I have read the code of HttpRequest object and can not find a user attribute and its code don't have a __setattr__ method. So I'm curious about why the code do not raise an AtrributeError when access to a no existing attribute.

Thanks for giving help.

Copyright Notice：Content Author:「chyoo CHENG」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/37586062/httprequest-instance-add-attribute-dynamically-in-django

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