def __init__(self):
        """Initialize this stub node.

        :sig: () -> None
        """
        self.variables = []  # sig: List[VariableNode]
        self.variable_names = set()  # sig: Set[str]
        self.children = []  # sig: List[Union[FunctionNode, ClassNode]]
        self.parent = None
def __init__ ( self ) : self . variables = [ ] self . variable_names = set ( ) self . children = [ ] self . parent = None
Initialize this stub node.

        :sig: () -> None