code: def get_bank(self):
          
          if self._lookup_session is None:
              mgr = get_provider_manager('ASSESSMENT', runtime=self._runtime, proxy=self._proxy)
              self._lookup_session = mgr.get_bank_lookup_session(proxy=getattr(self, "_proxy", None))
          return self._lookup_session.get_bank(Id(self._my_map['id']))
docs: Gets the ``Bank`` at this node.
  
          return: (osid.assessment.Bank) - the bank represented by this
                  node
          *compliance: mandatory -- This method must be implemented.*