class

问题 I'm getting into classes and interfaces. And I got one thing about it that annoys me, this is the first time I work with these kind of things so bear with me here.. Let's say I got this interface: // IFoo.d.ts export default interface IFoo { foo: string; bar: number; } When I implement it in a class I do the following: // FooModel.ts import IFoo from './IFoo'; export default class FooModel implements IFoo { foo: string; bar: number; constructor({ foo, bar }: IFoo = { foo: 'hello', bar: 1 }) {

问题 I know this is maybe a dumb question but I haven't found a solution yet. I have a Django model class who has some default attributes, and I want to change the value of the complete variable by calling a function: class Goal(models.Model): text = models.CharField(max_length=500) date = models.DateTimeField(auto_now=True) complete = False def set_complete_true(): complete = True But after calling set_complete_true() the complete variable still False, doesn't change. Thanks in advance! 回答1: An

问题 I am developing a class. The class-level data it will need is going to be relatively complex. To save typing and minimize mistakes, I would like to define a good bit of this data through functions. Also, I would like to make this data available to the user even if they aren't ready to instantiate the class. So, I wonder, is there a way to get these functions to run automatically as soon as the class is defined? As an example, I want something like import numpy as np def class foo: @this

问题 I can define a S3 method like this : `+.data.frame` <- function(e1,e2){"hello"} iris + iris # [1] "hello" But this won't work if e2 is a gg object : iris + geom_point() Error in iris + geom_point() : non-numeric argument to binary operator In addition: Warning message: Incompatible methods ("+.data.frame", "+.gg") for "+" I think it has something to do with S4 methods but I'm confused. Can you explain what's at play and how to sort it out ? desired output : iris + geom_point() # [1] "hello"

问题 Ok here is How i instantiate my Defclass and related Defmethod and Defparameter (defvar *account-numbers* 0) (defclass bank-account () ((customer-name :initarg :customer-name :initform (error "Must supply a customer name.") :accessor customer-name :documentation "Customer's name") (balance :initarg :balance :initform 0 :reader balance :documentation "Current account balance") (account-number :initform (incf *account-numbers*) :reader account-number :documentation "Account number, unique

问题 I am python Begineer and i learned that first parameter inside the method should be contain some 'self' keyword but i found the following program runs without self keyword can you explain about this below is my code... class Student(object): def __init__(self,name,age): self.name = name self.age = age def get_biggest_number(*age): result=0 for item in age: if item > result: result= item return result Sam = Student("Sam",18) Peter = Student("Peter",20) Karen = Student("Karen",22) Mike =

问题 if sample_rate != sr: waveform = torchaudio.transforms.Resample(sample_rate, sr)(waveform) sample_rate = sr I was wondering how this Resamle works in there. So took a look at the docs of torchaudio. I thought there would be __call__ function. Because Resample is used as a function. I mean that Resample()(waveform) . But inside, there are only __init__ and forward function. I think the forward function is the working function but I don't know why it is named 'forward' not __call__. What am I

问题 This question already has answers here : querySelector, wildcard element match? (5 answers) Closed 1 year ago . I would like to select any element owning a class starting by a given string, here is an example where the classes start with fi- <i class="fi-xmsl-user"></i> <i class="fi-stsl-map"></i> I would like to do this in pure JavaScript (no jQuery). I already read the following questions: select class starting with jquery How to get all elements by class name? Jquery select first letter?

问题 I am trying creating an NumPy array filled with an object, and I was wondering if there was a way I could broadcast to the entire array for each object to do something. Code: class player: def __init__(self,num = 5): self.num = num def printnum(): print(self.num) ... objs = np.array([player(5),player(6)],dtype=Object) objs.printnum() As it stands this returns an error. I have tried changing the dtype to: _object as per the manual, but nothing seems to work. 回答1: A numpy array of objects does

问题 In Xamarin, I am wanting to store data and global variables using the Application object. I looked at this resource for this code: http://www.helloandroid.com/tutorials/maintaining-global-application-state Here is my code: public class HelloApplication : Application { private int GlobalVariable = 1; public int GetGlobalVariable() { return GlobalVariable; } public void SetGlobalVariable(int GlobalVariable) { this.GlobalVariable = GlobalVariable; } } I am trying to reference the class using