Message queue + how to ensure that messages are not lost + how to ensure the orderliness of messages + how to deal with message accumulation

1. Basic concepts of message queue The message queue model is divided into: queue model and publish/subscribe model. Introduction to the queue model: Producers send messages to queues. A queue can store messages sent by multiple producers, and a queue can also have multiple consumers. There is a competitive relationship between consumers, that is, each […]

With just a few lines of Python code, you can achieve comprehensive automatic exploratory data analysis!

Exploratory data analysis is one of the important components of data science model development and data set research. When you get a new data set, you first need to spend a lot of time conducting EDA to study the inherent information in the data set. The automated EDA Python package can perform EDA with just […]

Use of Vue Zhongtian map to add points, lines, areas, convergence points, information windows, customized right-click menus, and switch map layer operations

The collection encapsulates several commonly used sky map methods for your own subsequent use and for everyone to directly CV. The comments are very detailed and can be used out of the box or copied. Add a single point marker Information window Information window parameters + click callback Add multiple point markers Add point aggregation […]

Qt opengl draws points, lines, triangles, polygons (2)

Article directory 1. Related macro definition parameters 2. Code and example diagrams 1. Point LG_POINTS 0x0000 2. Line GL_LINES 0x0001 3. Line GL_LINE_LOOP 0x0002 4. GL_LINE_STRIP 0x0003 5. GL_TRIANGLES 0x0004 6. GL_TRIANGLE_STRIP 0x0005 7. GL_TRIANGLE_FAN 0x0006 8. GL_QUADS 0x0007 9. GL_QUAD_STRIP 0x0008 10. GL_POLYGON 0x0009 Summarize 1. Related macro definition parameters #define GL_POINTS 0x0000 // […]

[Spring Cloud] Dark Horse Headlines Initial Project Construction

1. Download the initial project project provided by Dark Horse 1. Search for dark horse programmers in WeChat 2. Enter the Black Horse Programmer applet The first method: directly enter the Black Horse Programmer applet / The second method: click on the information download in the dark horse resources in the service in the public […]

With just a few lines of Python code, you can achieve comprehensive automatic exploratory data analysis!

Source | Data STUDIO Exploratory data analysis is one of the important components of data science model development and data set research. When you get a new data set, you first need to spend a lot of time conducting EDA to study the inherent information in the data set. The automated EDA Python package can […]

Crawl today’s headlines pictures (bs4 method)

Crawling today’s headline pictures (bs4 method) 1. Preliminary crawling Here we can easily figure out that the request method of this web page is a GET request. (Originally I planned to crawl beauties, but later I discovered that there would be image violations, so I changed it to crawling landscape images. To crawl beauties, you […]

Operating System – Experiment 2: Process Communication (Pipelines and Shared Memory)

Operating system experiment report Experiment 2: Process Communication (1) – Pipes and Shared Memory 1. Purpose of the experiment Be familiar with and master the pipeline mechanism and implement inter-process communication; Be familiar with and master the shared memory mechanism and implement inter-process communication. 2. Experimental content and steps 2.1 Task 1 Read the above […]

The scrapy framework crawls data (creates a scrapy project + xpath parses data + saves data through pipelines + middleware)

Table of Contents 1. Create a scrapy project 2. Xpath parses data 3. Data saving through pipelines 4. Middleware 1. Create a scrapy project 1. Create a folder: C06 Enter the following command in the terminal: 2. Install scrapy: pip install scrapy 3. Go to the folder: cd C06 4. Create project: scrapy startproject C06L02 […]