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There are four categories of variables IntVar(): integer variable, default is 0. DoubleVar(): floating point variable, default is 0.0 StringVar(): string variable, null by default Boolean var(): boolean variable, True is 1, False is 0. 41 set() and get() usage: from tkinter import * win=Tk() def view(): global Message if Message==False ...

Lambda programming 1. Lambda expressions and member references Introduction to Lambda: code blocks as function parameters // lambda expression presentation listener button.setOnClickListener { /* ... */ } Lambda and sets data class Person( val name: String, val age: Int ) >>> val list = listOf(Person("kerwin", 12), Person( ...

Runnable interface Runnable is an interface. There are only run methods in it. Thread also implements runnable interface, so to realize multithreading, you need to realize runnable interface finally, not to mention to directly demonstrate the code. Runnable test code public class RunnableDemo { public static void main(String[] args) { ...

spring initializes bean s in different environments in different order. For the same code, there is no error in the local startup, and there was no error in the test environment before, but now there is an error in the test environment Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' e ...

plotData.m file This function file is to distinguish the results of which the results are 0 and 1, mainly through the find function. function plotData(X, y) %PLOTDATA Plots the data points X and y into a new figure % PLOTDATA(x,y) plots the data points with + for the positive examples % and o for the negative examples. X ...

A scenario will be encountered in the development, as follows Object result1 = service1.func1();//Implementation 80 ms Object result2 =service2.func2();//Implementation 50 ms service3.func3(result1,result2); func3() needs to wait for func1 and func2 to execute. If func1 and func2 can be executed at the same time, the minimum waiting ...

Preface   What's the best brand of bread to sell? What is the most popular taste? I believe that every friend who likes bread will care about these problems. By crawling the bread data of Jingdong, on the one hand, this paper answers all kinds of questions about bread before, on the other hand, it brings you a complete data r ...

Clustering is a problem that we often need to solve. Using Python - > kmeans to achieve clustering is very simple. The following is an example to show you how to simply cluster and show the clustering results. The data source of this paper is from Baidu Library: https://wenku.baidu.com/view/eb73005f9b6648d7c1c746db?from=searc ...

spock is an all-round unit testing framework. The last article shared the use of the basic features of the spock framework, and on that basis, I made some attempts based on Groovy encapsulation, data-driven, and some advanced Groovy syntax I wrote.There's still a bit of a problem, I don't know if it's because I'm a Java and Groovy hybrid proj ...

In JavaScript, functions are first-class citizens. JavaScript is an object-oriented programming language, but it also has many features of functional programming, such as Lambda expressions, closures, high-order functions, etc. functional programming is a programming paradigm. function dada() { var a = 1; var b = function() { console.log(a ...