Programmer Group

This chapter is a continuation of the previous chapter. This chapter is mainly about regression problem. It designs a "salary increase calculator", which is a salary increase algorithm. Here is still the data. First, let's make a histogram of the requirements and results of the salary raiser: import pandas as pd imp ...

Some time ago, I learned the View slide and the use of the Scroller. It happens that there is chat function in the project, which is implemented in imitation of QQ chat. As the saying goes: good memory is better than scribbling. Today, we will practice. Realization effect No picture say a xx, let's take a look at the rende ...

Analysis of lambda expression Big premise: capture the timing of variables in the list. There is a difference between the capture list and the parameter list. The variables in the capture list are determined at the time of capture, not at the time of lambda call. The parameter list is determined at the time of call. So when I capture an int i ...

redis storage format We all know the storage types supported by redis (String/List/Hash/Set/SortedSet), but not necessarily used in our work. I hope that through this article, we can know how to use redis in java and how to operate these data types by redis. Basic Usage Operate on redis through jedis (the Java client that ...

String operation 1, Output duplicate string print('smile'*6) #Output 6 smile s   2, Output part of string through index print('smile'[1:]) print('smile'[1:3]) #output #mile #mi #ims This is the same as the previous list slicing rules.   3, Checking string contents with in a = 'Tomorrow will be a better day. ' print('day' in a) print('zzz ...

Recently, I have learned a lot of new knowledge. Thank you for your excellent teacher's detailed explanation. This blog records what I think. Want to learn more about functional testing in the Spring Boot project?This article takes you to learn more about using the Docker container in testing. This article focuses on applying some best practice ...

The role of new is known 1. The instance can access the properties and methods of the constructor 2. The instance can access the properties and methods in the constructor prototype //demo: function Person(name, age) { this.name = name this.age = age } Person.prototype.sayName = function () { console.log("this.name:",this.name) } const ...

Basic concepts of inheritance Inheritance and Derivation Inheritance concept Comprehensive Training of Access Control of Derived Classes (Inherit Three Ways, Class Three Access Control, Three Look Principles) Constructions and Destructions in Inheritance Type Compatibility Principle Constructions and Destructions in Inheritance Processing me ...

SQL Prompt not only formats the code exactly as you want, but also helps you quickly switch to other styles or apply exceptions to parts of SQL scripts that don't require specific styles. SQL Prompt automatically retrieves object names, syntax, and code snippets from the database to provide users with appropriate code choices.Automatic script ...

By Jeskson Source: front end tavern of dada Request and upload files GET and POST requests const express = require('express'); const app = express(); app.set('view', 'pug'); app.get('/', function(req,res){ // Output response message req.send('hello') }); app.get('/users/:gender', function(req,res){ // Get route parameters let gender = ...