How to clear all session variables without getting logged out

In versions of django < 1.8, session.flush deletes the session data and regenerates the session key. It won't affect other users since session keys are unique.

As of Django 1.8, any call to flush() will log out the user. From the docs:

Changed in Django 1.8: Deletion of the session cookie is a behavior new in Django 1.8. Previously, the behavior was to regenerate the session key value that was sent back to the user in the cookie.

If you want to be able to delete keys but keep the user logged in, you'll need to handle it manually:

for key in request.session.keys():
    del request.session[key]

Or just delete the specific keys that are of concern:

del request.session['mykey']