Django Hijack
With Django Hijack, admins can log in and work on behalf of others
...The field user_pk is mandatory and the value must be set to the target users' primary key. The optional field next determines where a user is forwarded after a successful hijack. If not provided, users are forwarded to the LOGIN_REDIRECT_URL. Do not forget to load the hijack template tags to use the can_hijack filter. The can_hijack returns a boolean value, the first argument should be user hijacker, the second value should be the hijacked.