def __init__(self, name, is_mutable):
        """Initialization of `VariableSymbol` class."""
        super().__init__(name)
        self.is_mutable = is_mutable
def __init__ ( self , name , is_mutable ) : super ( ) . __init__ ( name ) self . is_mutable = is_mutable
Initialization of `VariableSymbol` class.