class

问题 I'm working on a Python project and I want to do something like the next example, but is incorrect. I need some help, please! names = ['name1', 'name2'] for name in names: class name: [statements] Thank you! 回答1: The class statement requires a hard-coded class name. You can use the type function, however, to create such dynamic classes. names = ['name1', 'name2'] class_dict = {} for name in names: # statements to prepare d class_dict[name] = type(name, (object,), d) Here, d is a dictionary

问题 I have a program that performs database operations using SQLite.SQLiteAsyncConnection. I have two different models I'd like to work with, say Customers and Cars. Customers could be defined as public class Customer { [PrimaryKey] public string Id {get; set;} public string Name {get; set;} public int NumberOfKids {get; set;} public decimal Budget {get; set;} } and Cars could be defined as public class Car { [PrimaryKey] public string Id {get; set;} public int Year {get; set;} public string Make

问题 I have found the code from this link: class Node: def __init__(self, name, weight, children): self.children = children self.weight = weight self.weight_plus_children = weight def get_all_weight(self): if self.children is None: return self.weight_plus_children else: for child in self.children: print("child.get_all_weight()", child.get_weigth_with_children()) self.weight_plus_children += child.get_weigth_with_children() return self.weight_plus_children def get_weigth_with_children(self): return

问题 Can anyone help me solve the problem?? Before when I had only one method for class, which was void show(vector &list, string &filter) , get&display functions were in it, then i decided to split those functions into vector get() & void display() but when i return a new modified vector from vector get() the error appears: C26444 Avoid unnamed objects with custom construction and destruction (es.84). Here's a short code example for realization: #include <iostream> #include <vector> #include

问题 I created an instance of UserData so that other classes can observe this instance and show the necessary information by using the username. What I am trying to do here is, when a user is logged in, different classes with user related stored properties will be updated ( i.e. by calling the api) from time to time according to the user activity in the app. However, it shows the error 'Cannot use instance member 'userData' within property initializer; property initializers run before 'self' is

问题 This question already has answers here : Call a parent class's method from child class? (15 answers) Closed 4 years ago . I have two classes one parent and other child. class Parent(object): def __init__(self): #does something def method_parent(self): print "Parent" class Child(Parent): def __init__(self): Parent.__init__(self) def method_parent(self): print "Child" After inheriting the parent I want to modify Parent method method_parent keeping the original functionality of that method and

问题 In TypeScript 3.8+, what are the differences between using the private keyword to mark a member private: class PrivateKeywordClass { private value = 1; } And using the # private fields proposed for JavaScript: class PrivateFieldClass { #value = 1; } Should I prefer one over the other? 回答1: Private keyword The private keyword in TypeScript is a compile time annotation. It tells the compiler that a property should only be accessible inside that class: class PrivateKeywordClass { private value =

问题 In TypeScript 3.8+, what are the differences between using the private keyword to mark a member private: class PrivateKeywordClass { private value = 1; } And using the # private fields proposed for JavaScript: class PrivateFieldClass { #value = 1; } Should I prefer one over the other? 回答1: Private keyword The private keyword in TypeScript is a compile time annotation. It tells the compiler that a property should only be accessible inside that class: class PrivateKeywordClass { private value =

问题 I am trying to write a class template that uses a parameter-pack and implements a member function for each type contained in the parameter-pack. This is what I have so far: template <typename...T> class Myclass { public: void doSomething((Some_Operator_to_divorce?) T) { /* * Do Something */ std::cout << "I did something" << std::endl; } }; My goal is to have a class template that can be used in the following way: Myclass<std::string, int, double> M; M.doSomething("I am a String"); M

问题 I am trying to write a class template that uses a parameter-pack and implements a member function for each type contained in the parameter-pack. This is what I have so far: template <typename...T> class Myclass { public: void doSomething((Some_Operator_to_divorce?) T) { /* * Do Something */ std::cout << "I did something" << std::endl; } }; My goal is to have a class template that can be used in the following way: Myclass<std::string, int, double> M; M.doSomething("I am a String"); M