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Course Introduction：In Python, there is no need for temporary variables to swap two variables. The most common method is to unpack with tuples: a, b=b, a. This method first evaluates the right expression to generate a tuple (b, a), and then unpacks it to the left variable, which is suitable for all data types. In addition, arithmetic operations (addition, subtraction, multiplication and division) can be used to exchange numerical variables, but only numbers and may introduce floating point problems or overflow risks; it can also be used to exchange integers, which can be implemented through three XOR operations, but has poor readability and is usually not recommended. In summary, tuple unpacking is the simplest, universal and recommended way.

2025-07-11 comment 0  767

Course Introduction：It is very simple to perform numeric subtraction operations in Excel, and the subtraction formula is achieved by using the subtraction operator -. Below I will show how to use this formula. The numerical table we want to subtract is as follows: I will explain in detail how to do it below: Download Excel workbook SUBTRACTION-FORMULA.xlsx Step 1: Enter the number we want to subtract: Table of Contents - Free Exercise Workbook \- =C9 \- =C9 – \- =C9 – D9 =C9 Step 2: Enter the subtraction operator –=C9 – Step 3: Enter the number to which you subtract: =C9 – D9 Apply the same formula to the remaining cells by dragging down the lower right corner. Now,

2025-05-27 comment 0  473

Course Introduction：LocalTime instances can be created by obtaining the current time, specifying the specific time, or parsing the string, such as LocalTime.now(), LocalTime.of(14,30) and LocalTime.parse("15:45"); the operation time needs to be generated by plusHours(), minusMinutes() or with() to achieve addition and subtraction or adjustment of specific parts; it is suitable for representing the time points of daily repetition, but does not contain date and time zone information. The isBefore() or isAfter() method should be used when comparing.

2025-06-30 comment 0  407

Course Introduction：Arithmetic operators include addition, subtraction, multiplication, division and modulus, and are used for basic mathematical calculations. 1. Addition, subtraction, multiplication and division are represented by , -, and /, but different languages ??handle division results in different ways. For example, Python returns floating point numbers, C or Java returns integers; 2. The modulus operation is represented by % and returns remainder, which can be used to judge parity or loop control; 3. Compound assignment operators such as = and = can simplify code and improve readability; 4. The operation sequence follows priority rules, and the logical order can be adjusted by brackets to improve clarity and maintenance.

2025-07-02 comment 0  765

Course Introduction：In Python, operator overloading is implemented by defining special methods such as __add__ and __sub__. For example, I defined the Vector class in the scientific computing library, overloaded addition and subtraction operations to make the code more intuitive, but it needs to be used with caution to avoid confusion.

2025-05-28 comment 0  1147

Course Elementary  13795

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  82320

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  13157

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  24603

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  27463

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.