issue_comments: 859736218

I think I am quite confused by the fact that 'one' dimension can be a tuple (also I couldn't find a way to successfully create a dataset with a dim being a tuple, even by tweaking your example using list)

Was it what you imagined for the dataset construction ? (If I understand right, a virtual variable can't be a tuple) ``` def _construct_dataarray(self, name: Hashable) -> "DataArray": """Construct a DataArray by indexing this dataset""" from .dataarray import DataArray

    try:
        variable = self._variables[name]
    except KeyError:
        if isinstance(name, tuple):
            raise TypeError(f'The dimension "{name}" provided is a tuple, you may be intended to pass it as a list')
        else:
        _, name, variable = _get_virtual_variable(
            self._variables, name, self._level_coords, self.dims
        )

```