Convert a (pandas) dataframe to a great_expectations dataset, with (optional) expectations_config

def _convert_to_dataset_class(df, dataset_class, expectations_config=None, autoinspect_func=None):
    """
    Convert a (pandas) dataframe to a great_expectations dataset, with (optional) expectations_config
    """
    if expectations_config is not None:
        # Cast the dataframe into the new class, and manually initialize expectations according to the provided configuration
        df.__class__ = dataset_class
        df._initialize_expectations(expectations_config)
    else:
        # Instantiate the new Dataset with default expectations
        try:
            df = dataset_class(df, autoinspect_func=autoinspect_func)
        except:
            raise NotImplementedError(
                "read_csv requires a Dataset class that can be instantiated from a Pandas DataFrame")

    return df