docs: def get_proficiency_lookup_session_for_objective_bank(self, objective_bank_id=None):
          """Gets the OsidSession associated with the proficiency lookup
          service for the given objective bank.
  
          arg:    objectiveBankId (osid.id.Id): the Id of the obective
                  bank
          return: (osid.learning.ProficiencyLookupSession) - a
                  ProficiencyLookupSession
          raise:  NotFound - no ObjectiveBank found by the given Id
          raise:  NullArgument - objectiveBankId is null
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - supports_proficiency_lookup() or
                  supports_visible_federation() is false
          compliance: optional - This method must be implemented if
                      supports_proficiency_lookup() and
                      supports_visible_federation() are true
  
          """
          if not objective_bank_id:
              raise NullArgument
          if not self.supports_proficiency_lookup():
              raise Unimplemented()
          try:
              from . import sessions
          except ImportError:
              raise OperationFailed()
          try:
              session = sessions.ProficiencyLookupSession(objective_bank_id, runtime=self._runtime)
          except AttributeError:
              raise OperationFailed()
          return session