export.py 文件源码

def _field_schema_to_columns(cls, field_name, field_schema, field_prefix, columns_to_get):
        """ Given fields information, returns a tuple representing columns_to_get.

        :param field_name:
        :param field_schema:
        :param field_prefix: str, default ''
        :param columns_to_get: iterable
            columns to create for each field
        :return field_columns: tuple
        """
        field_columns = list()
        for column in columns_to_get:
            field_columns.append(cls.make_column_value(column, field_schema, field_name, field_prefix))

        return tuple(field_columns)