object

问题 I have this code in test.py: class Parent(object): def __init__(self): self.myprop1 = "some" self.myprop2 = "thing" def duplicate(self): copy = Parent() copy.myprop1 = self.myprop1 copy.myprop2 = self.myprop2 return copy And this other in test2.py: from test import Parent class Child(Parent): def __str__(self): return "{}, {}".format(self.myprop1, self.myprop2) obj1 = Child() obj2 = obj1.duplicate() obj2.myprop1 = "another" obj2.myprop2 = "stuff" # Accessing properties print("obj1, ", obj1

问题 Given this struct with a private stateful variable: struct Calibrate { private: Stitcher stitcher_obj_; } This is the stitcher object (with empty constructor): Stitcher::Stitcher(const std::vector<cv::Mat> &src_images){} When calling Calibrate , I am getting this error: default constructor of 'Calibrate' is implicitly deleted because field 'stitcher_obj_' has no default constructor Stitcher stitcher_obj_ ^ Thanks for any suggestions on how to fix this! 回答1: As soon as you provide a custom

问题 I'm using pygame and I'm using a function that set the selected position of a text in PyGame : def textPos(YPos , TextSize): TextPosition.center(60,YPos) print("Size : " + TextSize) but when I run the program, I get an error: TextPosition.center(60,YPos) : TypeError : 'Tuple' object is not callable There's a way to solve this problem? 回答1: 'Tuple' object is not callable error means you are treating a data structure as a function and trying to run a method on it. TextPosition.center is a tuple

问题 I would like to select an item from the dropdown list and would like to set the state of staffId to it. I would like dropdown to show the name, but after I select the name, set the staffid to state. I would also like to achieve this without hardcoding the values in an if-else loop as I have thousands of data to work with. This is the data fetched from WebAPI and stored in a state called items this.setState({ items: dataSource staffId: '' }) This state of items will be this. [ {"departmentName

问题 List<Object[]> values = query.getResultList(); //values = [obj1,obj2,obj3] //obj1 = "1", "01"; //obj2 = "1", "02"; //obj3 = "1:, "03"; Map<String, List<String>> resultMap = values.stream().collect(Collectors.groupingBy(???)); I need a map grouped as - {"1",["01","02","03"]} I have seen few references but nothing seems to work. what should i put in place of "???" ? if you need anything else , kindly comment. Thanks in advance. ref : Shortcut for adding to List in a HashMap groupingby list of

问题 I need to create an instance in class Crop of Plant class and i cant manage to find a way to make that work. Hope you guys can help at that. This my main where i'm sending an object to the class crop. int main(){ char select = 'a'; int plant_num = 2; int crop_num = 0; Crop crop[10]; Plant plant[20]; plant[0] = Plant("Carrots",'c'); plant[1] = Plant("Lettuce",'l'); plant[2] = Plant("Rosemary",'r'); crop[0] = Crop(plant[0],4,2); crop_num++; cout << "Garden Designer" << endl; cout << "==========

问题 I want to determine if my key is an object: {% for key in columns %} {% if key is object %} This is an object {% else %} This in not an object {% endif %} {% endfor %} But I get the error message: Unknown "object" test. 回答1: You can create your own Twig extension . I see you've tagged your question with Symfony so assuming you use Twig in Symfony, you can follow this tutorial: https://symfony.com/doc/3.4/templating/twig_extension.html What you need to do is add new TwigTest based on this

问题 Fruits class: #include <string> using namespace std; class Fruits { string color; public: Fruits() { color = "r"; } }; Main: #include "Fruits.cpp" void main() { Fruits* fruits[6]; fruits[0] = new Fruits(); // delete[] fruits[0]; // <-- does not work (deletes one object) // delete[] fruits; // <-- does not work (deletes all objects in the array) } How can I do this? 回答1: delete fruits[0] will delete that one object for you. delete[] instead serves to delete all non-null elements of that array,

问题 I have object like this where 'id', is unique. I need to remove duplicates from the array of objects in javascript in any version less than ES5. I need to compare based on the id field and remove its duplicates. Example: Object = [ {id: id_one, value: value_one, label: ABC}, {id: id_one, value: value_one, label: ABC}, {id: id_three, value: value_three, label: ABX}, {id: id_two, value: value_two, label: ABY}, {id: id_four, value: value_four, label: ABD} ]; Output: result = [ {id: id_one, value

问题 I'm building this exercise which involves the user filling out a form, and the info from the form is pushed into a firebase database and it produces a card which contains the info. There are basically three functions: addBookToLibrary() which takes the info from the form after the user hits the submit button and puts it into firebase, render() which draws the card with the info on it, and Book which creates the object from the data entered into the form. I decided to add retrievefromDatabase(