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Introductionpython provides us with five basic data structures: list, tuple, dict, set, string;Sometimes we need to maintain an orderly dict. So at this time, we will use the collection package provided by Python standard library. It provides many useful collection classes. Mastering these collection classes skillfully can not only make our cod ...

I have made great improvements in the original Local Dog Shopping Network-Web Location Navigation: Specific improvements include the following: 1. The original Ground Dog Shopping Network realized click navigation jump through anchor links. This jump is instantaneous without animation. I encapsulated menuClick(menus,items) click navigation fu ...

The Worker class not only implements Runnable, but also inherits AbstractQueued Synchronizer, so Worker itself is an executable task, and can also realize the function of locks. Worker is mainly used to manage the interruption status of threads and some indicators, such as the number of tasks completed; Worker simplifies the operation of acquir ...

Label PostgreSQL, pg_xlogdump, database profile background It is convenient to view TOP SQL in PostgreSQL, as follows: PostgreSQL How to Find TOP SQL (e.g. IO-consumed SQL) From another point of view, such as REDO files, we can also analyze the operation type of the database in each period, analyze the resource consumption of the database, a ...

In a master-slave environment, if the master library hangs, how to elect a slave library as the master library?As shown in the figure:If M hangs, how do I elect a slave library from S1 and S2 as the master library?Solutions to Traditional Reproduction(1) View the status of slave libraries:S1: show slave status；S2: show slave status；root@local ...

Problem Description In their spare time, Holmes and Watson play a game: N integers are written on N cards.Two people take a card in turn.The number required of the next person must be the approximate or multiple of the number taken by the previous person.For example, one time Holmes took a card with the number "6", Watson could th ...

Program Tool Class: package com.liutao.utilitys; import org.springframework.http.HttpStatus; import org.springframework.validation.BindingResult; import org.springframework.validation.ObjectError; import javax.servlet.http.HttpServletResponse; import java.util.List; /** * Parametric Verification Tool Class * * @author LIUTAO * @version ...

Copyright Statement: This article is the original article of the blogger. It can not be reproduced without the permission of the blogger.             Android Baidu Map-based Enquiry of Peripheral Buses    The last article introduced how to use Baidu Map to locate on Android platform. Next, it introduced how to use Baidu Map to ob ...

Leetcode 46. Full permutations of arrays · TotalAccepted: 160245 · TotalSubmissions: 378230 · Difficulty: Medium · Contributor: LeetCode Given a collection of distinct numbers,return all possible permutations. For example, [1,2,3] have the following permutations: [ [1,2,3], [1,3,2], [2,1,3], [2,3 ...

Partition table in Oracle is a good feature of Oracle. It can divide large tables into several small tables, so as to improve the efficiency of SQL execution for the large table, and each partition is transparent to the application.Each partition in the partition table has its own storage characteristics, including table space, PCT_FREE, etc. W ...