How to use the pydomo.datasets.ColumnType function in pydomo

def datasets(self, domo):
        '''

        DataSets are useful for data sources that only require occasional replacement. See the docs at
        https://developer.domo.com/docs/data-apis/data

        '''
        domo.logger.info("\n**** Domo API - DataSet Examples ****\n")
        datasets = domo.datasets

        # Define a DataSet Schema
        dsr = DataSetRequest()
        dsr.name = 'Leonhard Euler Party'
        dsr.description = 'Mathematician Guest List'
        dsr.schema = Schema([Column(ColumnType.STRING, 'Friend')])

        # Create a DataSet with the given Schema
        dataset = datasets.create(dsr)
        domo.logger.info("Created DataSet " + dataset['id'])

        # Get a DataSets's metadata
        retrieved_dataset = datasets.get(dataset['id'])
        domo.logger.info("Retrieved DataSet " + retrieved_dataset['id'])

        # List DataSets
        dataset_list = list(datasets.list(sort=Sorting.NAME, limit=10))
        domo.logger.info("Retrieved a list containing {} DataSet(s)".format(
            len(dataset_list)))

        # Update a DataSets's metadata
        update = DataSetRequest()