code: def get_last_activity(session):
      
      try:
          return datetime.strptime(session['_session_security'],
                  '%Y-%m-%dT%H:%M:%S.%f')
      except AttributeError:
          #################################################################
          # * this is an odd bug in python
          # bug report: http://bugs.python.org/issue7980
          # bug explained here:
          # http://code-trick.com/python-bug-attribute-error-_strptime/
          # * sometimes, in multithreaded enviroments, we get AttributeError
          #     in this case, we just return datetime.now(),
          #     so that we are not logged out
          #   "./session_security/middleware.py", in update_last_activity
          #     last_activity = get_last_activity(request.session)
          #   "./session_security/utils.py", in get_last_activity
          #     '%Y-%m-%dT%H:%M:%S.%f')
          #   AttributeError: _strptime
          #
          #################################################################
  
          return datetime.now()
      except TypeError:
          return datetime.now()
docs: Get the last activity datetime string from the session and return the
      python datetime object.