What does Python mean by closures?

Closure is a common concept in programming language, but to be honest, the term is a bit obscure. After checking the information on the Internet for half a day, I still don't know what to do. What I wonder is: what kind of problem is this thing used to solve? Or what is his role? First of all, function After consulting many materials, the summa ...

Posted by saradrungta on Sun, 21 Jun 2020 21:57:13 -0700

Elasticsearch Series - Index Management for Production Clusters

outline Indexing is one of the most frequent daily operations we use in Elasticsearch. This article takes a look at the indexing operations of Elasticsearch from the perspective of operations personnel. basic operation From the perspective of running children's shoes, let's take a look at the daily operation of the index in addition to CRUD, or ...

Posted by jossejf on Sun, 21 Jun 2020 17:38:00 -0700

Python Web Crawler Warfare: Jiayuan discovered amazing secrets after crawling nearly 60,000 Miss and Sister data

It's 11/11 again. I don't know when it started. 11/11 changed from "Singles Day" to "11/11 Shopping Carnival". The last single dog festival was also successfully conquered and became a holiday for couples to give gifts and love. Turning over the quiet to silent chat list, I suddenly woke up. No, we can't go on like this. Wh ...

Posted by dan7474 on Sun, 21 Jun 2020 15:01:24 -0700

Price programmer: How many of the five must-know methods for Java asynchronous invocation to synchronize?

Let's start with the understanding of asynchronization and synchronization: Synchronous call: The caller waits continuously for the result to be returned during the call. Asynchronous call: During the call, the caller does not directly wait for the result to be returned, but performs other tasks, usually in the form of a callback function. I ...

Posted by algy on Sun, 21 Jun 2020 14:45:01 -0700

Project: Online OJ--MinMIn's Online OJ

MinMin's Online OJ 1. Project objectives Similar to Leetcode, a simple title-brushing project is implemented. Users can access the title list page in the browser, click on the title to enter the title details page, and write, compile, run the code here, and return the results to the browser page 2. Functions implemented by the project 1. You c ...

Posted by otuatail on Sun, 21 Jun 2020 14:40:08 -0700

C ා multithreaded programming process and thread

1, Process In short, a process is an abstraction of resources and a container of resources. In traditional operating systems, a process is the basic unit of resource allocation and execution. Processes support concurrent execution because each process has its own data and stack space. If a program wants to execute concurrently, just start mult ...

Posted by Kibeth on Sun, 21 Jun 2020 00:18:53 -0700

Algorithm training phase I

Overview of the first phase of algorithm As the first phase of algorithm training, it is not difficult. But as a normal algorithm learner. We should not be bound by the present, so we will talk about as many ways as possible. As a review of previous algorithm learning. The methods used here will be described in detail in other documents. Missin ...

Posted by PeterPopper on Sat, 20 Jun 2020 21:24:09 -0700

Gobang game designed by Java

requirement: 1. Write Gobang game in java 2. The program has a simple and beautiful graphical interface, and the interface is mainly composed of board, title and buttons for game operation. In addition, the size of the game interface is immutable, the program will automatically obtain the size informa ...

Posted by haddydaddy on Sat, 20 Jun 2020 01:19:45 -0700

Class relation -- inheritance relation

13. Class relationship -- inheritance relationship 1. Inheritance relationship 1.1 concept of inheritance ·Inheritance mechanism is an indispensable key concept in object-oriented programming, the foundation of code reusability, and the main way to improve the expansibility and maintainabil ...

Posted by heerajee on Fri, 19 Jun 2020 21:41:21 -0700

Factory Design Patterns for Java Design Patterns

Plant Design Mode Interface-oriented programming reduces coupling between classes and Applications Three forms of factory design patterns: 1. Static Factory There is a static method in the factory that determines the type of "manufacturing" based on the parameters and transfers the resp ...

Posted by spider22 on Fri, 19 Jun 2020 19:06:27 -0700