Gets the value for the nested `key`. Names with underscores will be considered as one key. Args: key: str of the form `([A-Za-z_][A-Za-z0-9_]*)(.[A-Za-z_][A-Za-z0-9_]*)*.`. Returns: The value for the given nested key. Raises: KeyError: if a key is not pr
(self, key: str)
source not stored for this graph (policy: none)