class

问题 I am in a programming class that has provided me with a project but I have no idea where to start and was hoping someone could push me in the right direction. I am only posting part of the project so that someone can show me a bit of the code to get an idea of how its done as I have taken a programming class before but I am out of practice. Create an application called Registrar that has the following classes: A Student class that minimally stores the following data fields for a student: Name

问题 I have the next situation. The goal of the following method is to return the object created from the incoming string. So I have: class Situation(Generator): pass And the method inside parent class: class Generator(object): def createsituation(self, stringsituation="situation"): return "Instance of Situation" The incoming string always equals to string "situation". Is it possible in python? 回答1: You can easily map strings to classes, yes. Classes are just more objects, you can store them in

问题 I have a Matrix class template as follows: template<typename T, std::size_t nrows, std::size_t ncols> class Matrix { T data[nrows][ncols]; public: T& operator ()(std::size_t i, std::size_t j) { return data[i][j]; } }; What I want is to define a .setIdentity() function only for instantiations when nrows==ncols is true at compile time. And there will be no definition of .setIdentity() when nrows==ncols is false . What I am trying is using enable_if idiom, but that will define the function for

问题 I'm having a problem with pyqt5. I have this piece of code to instantiate my class and open my window without closing after the show method (because gc). def user_crud(): global crud crud = TCrudUsuario() crud.show() it works well, but on the TCrudUsuario class, I have some buttons that connects to a method with arguments, so I'm using a lambda (tried with partial, but the same problem happens), something like this: self.btnNovo.clicked.connect(lambda: self.manage_user(1)) the problem is: if

问题 I think perhaps my questions have been answered in part in other locations on stackoverflow, but I felt I might get a more comprehensive answer by asking it all together. I apologize for anything dumb I might type--I don't work in PHP nearly enough, so when I do, I feel like I'm learning it all over again. Anyway, let's say I've got a mysql database table called "items" with the following columns: item_id , item_type , item_name . And I've got a PHP class that looks like this: class Item {

问题 I coded this for a bus system but having trouble displaying the objects that have been saved in stud1 . I tried using readData but didn't work. The purpose of the code is to 1. receive input(s) in the form of bus info from the user and save them and 2. output all buses input into the system(reposted altered code) #include <iostream> #include <fstream> #include <vector> using namespace std; string busType, busMake, regNum; char menu(); int id = 0; //int staff[50]; int carObjNum, option0; int

问题 I'm having a problem with pyqt5. I have this piece of code to instantiate my class and open my window without closing after the show method (because gc). def user_crud(): global crud crud = TCrudUsuario() crud.show() it works well, but on the TCrudUsuario class, I have some buttons that connects to a method with arguments, so I'm using a lambda (tried with partial, but the same problem happens), something like this: self.btnNovo.clicked.connect(lambda: self.manage_user(1)) the problem is: if

问题 I'm having a problem with pyqt5. I have this piece of code to instantiate my class and open my window without closing after the show method (because gc). def user_crud(): global crud crud = TCrudUsuario() crud.show() it works well, but on the TCrudUsuario class, I have some buttons that connects to a method with arguments, so I'm using a lambda (tried with partial, but the same problem happens), something like this: self.btnNovo.clicked.connect(lambda: self.manage_user(1)) the problem is: if

问题 With regard to this link Predicted probabilities in R ranger package, I have a question. Imagine I have a mixed data frame, df (comprising of factor and numeric variables) and I want to do classification using ranger. I am splitting this data frame as test and train sets as Train_Set and Test_Set. BiClass is my prediction factor variable and comprises of 0 and 1 (2 levels) I want to calculate and attach class probabilities to the data frame using ranger using the following commands: Biclass

问题 In my Typescript app, there's a class that represents some data. This class is being shared end to end (both front-and-back ends use it to structure the data). It has a property named items which is an array of numbers. class Data { constructor() { this.items = [0]; } addItem() { this.items = [...this.items, this.items.length]; } } I'm trying to render those numbers in my component, but since modifying the class instance won't cause a re-render, I have to "force rerender" to make the new