The recommended way of retrieving a section by key when extending configmanager's behaviour.

def get_section(self, *key):
        """
        The recommended way of retrieving a section by key when extending configmanager's behaviour.
        """
        section = self._get_item_or_section(key)
        if not section.is_section:
            raise RuntimeError('{} is an item, not a section'.format(key))
        return section