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urllib urllib is a built-in HTTP request Library in python. I don't think it's commonly used now. It's not easy to use, but I know the basis of crawlers Four modules urllib.request: request moduleurllib.error: exception handling module (ensure that the program will not terminate unexpectedly)urllib.parse: url parsing module (split, merge, etc. ...

brief introduction In concurrent programming, we sometimes need to use thread safe queues. If we want to implement a thread safe queue, there are two ways to implement it, one is to use blocking algorithm, the other is to use non blocking algorithm. The queue using blocking algorithm can be implemented by one lock (the same lock for queue entr ...

2021.5.4 Title: Given a string, please find the length of the longest substring that does not contain duplicate characters. Example: input: s = "pwwkew" output: 3 explain: Because the longest substring without duplicate characters is "wke"，So its length is 3.      Please note that your answer must be the length of the substring,"pwke" It' ...

1, What problems can asynchronous IO of global variables cause? The parent and child processes are accumulated separately: #include <stdio.h> #include <signal.h> #include <unistd.h> #include <stdlib.h> // The parent-child processes accumulate n respectively // Send signals to each other every 1 second to inform ac ...

ArrayList and LinkedList design structure Note: The green solid line is the inheritance relationship between interfacesThe green dotted line is the class implementation interface relationshipBlue implementations are inheritance relationships between classes 1. ArrayList design structure 2. LinkedList design structure 3. Analyze the str ...

Learn about Spring Official website: https://spring.io/projects/spring-framework#learn Official download address: https://repo.spring.io/ui/native/release/org/springframework/spring GitHub: https://github.com/spring-projects/spring-framework <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --> <dependency&g ...

Branch and loop Process control - controls the sequence of code execution Sequential structure: the code is executed from top to bottom, and each statement is executed only once. (default) Branch structure: select whether to execute or not to execute part of the code according to the conditions. (use if) age = int (input("Please enter your ...

Git address: https://gitee.com/jyq_18792721831/sparkmaven.git Create Project Let's start by creating a generic maven project Create a project followed by a hello module Is also a normal maven module Increase scala dependency We don't write code in the parent project, the parent project is just for managing the child project, so th ...

introduction: Sorting algorithm is one of the most basic algorithms in data structure and algorithm. Here are ten classic sorting algorithms to explain. Taoist friends who don't know can come here to sweep away their blindness. From "rookie tutorial". explain    sorting algorithms can be divided into internal sorting ...

A. Do Not Be Distracted! Original title link: https://codeforces.ml/contest/1520/problem/A General idea of the topic If such as aaaaadddbbfgh, each letter appears only once continuously, then YES is output; otherwise, if such A as AABBA appears twice or more continuously in different positions, NO is output #include <iostream> # ...