In data-intensive fields such as finance, e-commerce, and human resources, at least 120 million repetitive Excel operations occur weekly. When I witnessed a CFO of a publicly listed company complete a report merge that would have taken all night with just three lines of Python code, I realized: when Excel meets Python, it’s like the … Read more
Exclusive: Python Bytecode Analysis, Interpreter Execution Principles, and Performance Optimization At three o’clock that morning, I was still debugging a bizarre performance issue. The code logic was not complex, but the execution efficiency was absurdly low. The coffee had gone cold. I sighed. In my eight years of Python development, I have experienced similar situations … Read more
Source: Authorized Reprinted from Programming Guide (ID: cs_dev) Author: Programming Guide Today, I saw a video online where the presenter mentioned that the current trend in learning paths is a complete set of arrangements. For example, in the Java learning path, most bloggers assume you will focus on Java backend development and attach a bunch … Read more
This article aims to clarify all input and output issues in the C language. It provides a complete explanation from multiple aspects. It is recommended to bookmark this article. 1. Overview 1. Classification by IO Location According to the location of IO, it can be divided into <span>standard IO</span> (i.e., keyboard, screen), <span>files</span>, and <span>memory</span>. … Read more
In 1969, Ken Thompson developed the UNIX system at Bell Labs in just three weeks, with the editor ed completed in only one week. However, this command-line editor was originally designed to accommodate teleprinters rather than display terminals. As a result, ed does not allow you to directly modify a line of text in an … Read more
Scenario 274: MySQL/MariaDB Service Fails to Start Issue: MySQL/MariaDB service fails to start. Solution: Check the MySQL/MariaDB error log for details: tail -f /var/log/mysql/error.log Verify if there are errors in the MySQL/MariaDB configuration file: cat /etc/my.cnf # or cat /etc/mysql/my.cnf Check for port conflicts: netstat -tulnp | grep 3306 Ensure there is enough disk space. … Read more
<span>at</span> is a command-line tool used to automatically execute various commands or scripts at a specified time and date. Tasks created with <span>at</span> are executed only once, making it an ideal tool for managing one-time tasks at precise time points. This article will introduce how to use <span>at</span> along with its companion tools <span>batch</span>, <span>atq</span>, … Read more
Notepad++ is a widely popular free and open-source code editor on the Windows platform, known for its lightweight, efficient, and feature-rich capabilities (such as syntax highlighting, multi-language support, and plugin extensions), making it a preferred choice for developers. However, since Notepad++ does not provide a native Linux version, Linux users need to look for alternatives … Read more
When building high-performance, highly concurrent Linux applications, understanding the underlying mechanisms of processes and threads is crucial. <span>fork()</span> and <span>clone()</span> are two core system calls that not only form the basis of process creation but also directly impact the implementation and performance of threads. This article will delve into the workings of <span>fork()</span> and <span>clone()</span> … Read more
