arguments

问题 So I am practicing using Tkinter with python, and I am just trying to learn the basics. My code right now is import Tkinter as tk class Example(tk.Frame): def __init__(self, parent): tk.Frame.__init__(self, parent) self.prompt = tk.Label(self, text="Press a button", anchor="w") self.button1 = tk.Button(self, text="Button 1", command = self.button1) self.button2 = tk.Button(self, text="Button 2", command = self.button2) self.output = tk.Label(self, text="") # lay the widgets out on the screen.

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 This question already has answers here : Is there a way to provide named parameters in a function call in JavaScript? (10 answers) Closed 1 year ago . So imagine we got a function like below, and I want to use the default value for the first parameter a and a custom value for second parameter b . const func = (a = 1 , b = 2) => { console.log("a is equal to " + a, " and b is equal to " + b) } I want to just pass one value for parameter b. something like this: func(b : 7); // I want it to print

问题 Suppose I have a function like that: public void Set(int a, string b, char c, float d, int e, float f, string g){ //do something with a //do something with b //... //do something with g } I need to do only some of these things, based on the arguments I want to send to the function. The rest should be ignored. For example: Set(a: 1, c: 'x', f: 1.4f, g: "hello") . Only the arguments I sent must be taken in account, the rest should just be ignored. How can I write such function that behaves like

问题 Suppose I have a function like that: public void Set(int a, string b, char c, float d, int e, float f, string g){ //do something with a //do something with b //... //do something with g } I need to do only some of these things, based on the arguments I want to send to the function. The rest should be ignored. For example: Set(a: 1, c: 'x', f: 1.4f, g: "hello") . Only the arguments I sent must be taken in account, the rest should just be ignored. How can I write such function that behaves like

问题 I am trying to create a App base on user input with ArrayList. But there is some problem that I need to understand first. PS: I want to try with normal value first before going into user input. And this is just a rough sketch up to make me understand how to use multiple arguments in a arraylist. This is the Student package test; import java.text.SimpleDateFormat; import java.util.Date; public class Student { private String name; private Date DOB; private String[] friend; private String school

问题 This may not be the most thought provoking question, but nevertheless has struck my curiosity. I have not been able to come across any answer (let alone a definitive one) on the web. While reading Advanced Shell Scripting, I came across this section regarding command line positional arguments which states that anything after the the ninth argument must be surrounded by ${} (the longer form of variable referencing/substitution). Simply put, why must you reference command line argument ten (and