Authenticating a user without retrieving or saving from a database

My objective is  to authenticate a user from a custom authentication system.

I am not sure how I could create a user object without creating a user in the database.

If I do something like this

u =User.objects.create_user('john', 'lennon@thebeatles.com', 'johnpassword')

the above fails and returns Client.DoesNotExist error (probably because a db is not configured probably)

My question is can I create a user at runtime without saving to a db.

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