How to use the atlite.datasets.modules.items function in atlite

Parameters
    ----------
    module : str/list, optional
        Module name(s) which to inspect. The default None will result in all
        modules

    Returns
    -------
    pd.Series
        A Series of all variables. The MultiIndex indicated which module
        provides the variable and with which feature name the variable can be
        obtained.

    """
    features = {name: m.features for name, m in datamodules.items()}
    features =  pd.DataFrame(features).unstack().dropna() \
                  .rename_axis(index=['module', 'feature']).rename('variables')
    if module is not None:
        features = features.reindex(atleast_1d(module), level='module')
    return features.explode()