def __init__(self, dataset, group=None):
        """
        Parameters
        ----------
        ds : pydap DatasetType
        group: str or None (default None)
            The group to open. If None, the root group is opened.
        """
        self.dataset = dataset
        self.group = group

        Parameters
        ----------
        ds : pydap DatasetType
        group: str or None (default None)
            The group to open. If None, the root group is opened.
        
xarray/backends/pydap_.py