methods

问题 When using classmethod to dynamic change the method in subclass, how to dynamic change signatures of method? example import inspect class ModelBase(object): @classmethod def method_one(cls, *args): raise NotImplementedError @classmethod def method_two(cls, *args): return cls.method_one(*args) + 1 class SubClass(ModelBase): @staticmethod def method_one(a, b): return a + b test = SubClass() try: print(inspect.signature(test.method_two)) except AttributeError: print(inspect.getargspec(test

问题 I'm trying to learn more about typescript. in javascript you can write a function that returns an object with properties and methods added dynamically. For example (just an example): function fn(val) { var ret = {}; if (val == 1) { ret.prop1 = "stackoverflow"; ret.fn1 = function () { alert("hello stackoverflow"); } } if (val == 2) { ret.fn2 = function () { alert("val=2"); } } return ret; } window.onload = function () { alert(fn(1).prop1); //alert "stackoverflow" fn(1).fn1(); //alert "hello

问题 I had tried to create method and call it from another file to the main class but It won't work the error message said "java.lang.NullPointerException" Main.class Keywords kw = new Keywords(); @When("^gmailDD$") public void gmailDD() throws Throwable{ WebDriverWait wait5s = new WebDriverWait(driver, 5); String regis = "/html/body/div[2]/div[1]/div[5]/ul[1]/li[3]/a"; String dd = "/html/body/div[1]/div/footer/div/div/div[1]"; String empty = "/html/body/div[1]/div/footer"; kw.clickbyxpath(regis);

问题 I am trying to return multiple variables from a method. This is what I have tried so far: This code is the method in the class: public function getUserInfo(){ $stmt = $this->dbh->prepare("SELECT user_id FROM oopforum_users WHERE username = ?"); $stmt->bindParam(1, $this->post_data['username']); $stmt->execute(); while($row = $stmt->fetch(PDO::FETCH_ASSOC)) { $user_id = $row['user_id']; $thumb = $row['thumbnail']; } return array($user_id, $thumb); } I attempt to place each variable in a list

问题 I resolve a problem which was showing up no compatibility on Edge but in Chrome. So, I changed using Object.assign(a, {}) instead of {...a, {}}. Here's where I discussed this previous problem: I would like to know why my website is not showing up on Edge? it's developed on JavaScript But, later I got another error. And let me explain you. It's this one on the console: SCRIPT1005: Expected '('. This error appears just on Edge browser. main.load = function (page) { function getClass(className)

问题 i'm trying to make a simple form to upload files with jquery/ajax. this is a part of my code: var formData = new FormData($(this)[0]); $.ajax({ url: 'uploader.php', type: 'POST', data: formData, async: false, cache: false, contentType: false, processData: false, success: function (data) { $('#ShowR').html(data); } }); i'm trying to change this code to $.post method like this: var formData = new FormData($(this)[0]); $.post('uploader.php', {action:"ShowGTR",MyFiles:formData}, function(data) {

问题 I am creating a program where 2 classes are used. In one class, i create methods that are then called by the second class. All methods are contained in the first class and the 2nd class simply calls them and executes the code. Class 1 import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; public class Student { private Scanner scanner; private String firstName; private String lastName; private int homeworkScore; private int testScore; private String letterGrade;

问题 Going straight to the point, i have made a code to test concurrency in java, using synchronized methods: Code: public class ThreadTraining { public static class Value { private static int value; public static synchronized void Add() { value++; } public static synchronized void Sub() { value--; } public static synchronized int Get() { return value; } } public static class AddT implements Runnable { public static String name; public AddT(String n) { name = n; } @Override public void run() {

问题 I got an application which should call different methods, based on the params' input. My idea until now is basically, that I create a Switch and call the methods separately by its case. Example: switch (methodName) { case "method1": method1(); break; case "method2": method2(); break; default: System.out.println(methodName + " is not a valid method!"); } I was considering the option to invoke the method by its given string, as provided in this question: How do I invoke a Java method when given

问题 Is there a method like indexOf but that would return all placements of the specified string, in an array? Like "test test atest".method(test) would return [0, 5, 11] 回答1: I'm not aware of such a method, but it's pretty easy to write using indexOf : function findAll(string, substring) { var i = -1; var indices = []; while ((i = string.indexOf(substring, i+1)) !== -1) { indices.push(i); } return indices; } console.log(findAll("test test atest", "test")); // Output: // [ 0, 5, 11 ] 回答2: You