The Level 3 requirements concentrate on being able to log in and out of theapplication and see a page customised for the user. To meet this level you must implement anotherset of procedures in the module user.py, and one more procedure in interface.py and then extend yourweb application to allow user login. Unit Tests This level adds four procedures in a new usersthat deal with authenticating usersand managing user sessions, and another procedurein the interface module to access images for a given user.They act as an interface to the users and sessions tables inthe database. These procedures are implemented in the module users.py; a version ofthis file with just the procedure stubs is provided for you.

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