Expression.visit_structured(function, combinator)[source]

Recursively visit subexpressions. Apply ‘function’ to each subexpression and pass the result of each function application to the ‘combinator’ for aggregation. The combinator must have the same signature as the constructor. The function is not applied to bound variables, but they are passed to the combinator. :param function: Function to call on each subexpression :param combinator: Function with the same signature as the constructor, to combine the results of the function calls :return: result of combination