Course Introduction：To improve Python code performance, benchmarking should be conducted in advance to find bottlenecks. 1. Use the timeit module to quickly measure small pieces of code, and reduce errors by running multiple times; 2. Use cProfile to analyze the performance distribution of the entire program, and combine the pstats module to filter the most time-consuming functions; 3. Avoid misunderstandings such as running only once, ignoring the I/O impact, premature optimization, etc., and ensure the consistent test environment; 4. Use third-party tools such as Py-Spy, line_profiler and memory_profiler to achieve finer granular performance analysis and memory monitoring.
2025-07-21 comment 0 829
Course Introduction：How to efficiently manage the build, test, and deployment process is a common problem when developing a PHP project. I've encountered a dilemma in a project: Every time a new version is released, I have to manually perform a series of complex operations, including running tests, generating documentation, and deploying code. This is not only time-consuming and labor-intensive, but also prone to errors. After some exploration, I found Phing, a powerful PHP project building tool, which was easily installed and used through Composer, completely solving my problem.
2025-04-17 comment 0 289
Course Introduction：To run the first PHP script, you must first build a server environment, and then write basic code to test and run. 1. Locally install integrated environments such as XAMPP, WAMP or MAMP; 2. Use PHP that comes with Mac or Linux system; 3. Run code through an online PHP editor; 4. Place the PHP file in the server directory such as http://htdocs; 5. Write the included .php file; 6. Visit http://localhost/test/index.php through the browser to view the results; 7. Pay attention to check whether the server is running, whether the path is correct and whether the syntax is wrong; 8. You can try to output time or process forms and deepen your understanding.
2025-07-17 comment 0 437
Course Introduction：The running mechanism of Java programs mainly includes compilation into bytecode, JVM execution and automatic memory management. First of all, Java code is compiled into platform-independent bytecode (.class file) through javac, realizing "write once, run everywhere". Next, the JVM loads the bytecode and interprets it by the execution engine or compiles it into machine code through JIT. At the same time, the JVM is also responsible for class loading, memory management and garbage collection. Then, the class loader (ClassLoader) loads class files from disk or network, and the runtime data area includes heap, stack, method area, etc. for data storage for program operation. Finally, the garbage collection mechanism automatically recognizes and frees object memory that is no longer in use, avoiding the complexity of manual memory management. The whole process starts
2025-06-27 comment 0 633
Course Introduction：To connect a Java program to a MySQL database, you need to prepare dependencies, load drivers, and establish connections. 1. Add MySQL driver dependencies. The Maven project introduces mysql-connector-java in pom.xml. The jar package is manually added to non-Maven projects; 2. explicitly load the JDBC driver class and use Class.forName("com.mysql.cj.jdbc.Driver") to ensure compatibility; 3. Correctly configure the URL, username and password when establishing a connection, pay attention to the database address, port, time zone and SSL settings; if the connection fails, check the MySQL running status, network access permissions, username and password
2025-07-14 comment 0 956
Course Elementary 13819
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82352
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13173
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24624
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27483
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
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