Display information about the container's data objects (note that info
        on metadata and visualization objects is also provided).

        Note:
            Sizes are reported in bytes.

def info(self):
        """
        Display information about the container's data objects (note that info
        on metadata and visualization objects is also provided).

        Note:
            Sizes are reported in bytes.
        """
        names = []
        types = []
        sizes = []
        names.append('WIDGET')
        types.append('-')
        s = 0
        sizes.append(s)
        names.append('METADATA')
        types.append('-')
        s = 0
        for obj in self._rel().values():
            s += getsizeof(obj)
        sizes.append(s)
        for name, obj in self._data().items():
            names.append(name[1:] if name.startswith('_') else name)
            types.append('.'.join((obj.__module__, obj.__class__.__name__)))
            if isinstance(obj, pd.Series):
                sizes.append(obj.memory_usage())
            else:
                sizes.append(obj.memory_usage().sum())
        inf = pd.DataFrame.from_dict({'object': names, 'type': types, 'size': sizes})
        inf.set_index('object', inplace=True)
        return inf.sort_index()