def print_tree(self) -> str:
        """Convert AST object to tree view of BEL AST

        Returns:
            printed tree of BEL AST
        """

        if self.ast:
            return self.ast.print_tree(ast_obj=self.ast)
        else:
            return ""
def print_tree ( self ) -> str : if self . ast : return self . ast . print_tree ( ast_obj = self . ast ) else : return ""
Convert AST object to tree view of BEL AST

        Returns:
            printed tree of BEL AST