code: def _check_existence_by_collection(self, container, item_name):
          '''Check existnce of item based on get collection call.
  
          :param collection: container object -- capable of get_collection()
          :param item_name: str -- name of item to search for in collection
          '''
  
          coll = container.get_collection()
          for item in coll:
              if item.name == item_name:
                  return True
          return Falsf _check_existence_by_collection(self, container, item_name):
          '''Check existnce of item based on get collection call.
  
          :param collection: container object -- capable of get_collection()
          :param item_name: str -- name of item to search for in collection
          '''
  
          coll = container.get_collection()
          for item in coll:
              if item.name == item_name:
                  return True
          return False
docs: Check existnce of item based on get collection call.
  
          :param collection: container object -- capable of get_collection()
          :param item_name: str -- name of item to search for in collection