def is_defined(self, symbolTable=None):
        """ True if this macro has been defined
        """
        if symbolTable is None:
            symbolTable = self.table

        return symbolTable.defined(self.id_)
def is_defined ( self , symbolTable = None ) : if symbolTable is None : symbolTable = self . table return symbolTable . defined ( self . id_ )
True if this macro has been defined