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Article 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

Article 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

Article 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

Article 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

Article 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

Article Introduction：In Excel, you often need to go beyond simple arithmetic operations like addition or subtraction. Recently, I had to compute 2 raised to the power of 10 while working on some data. Here’s how I accomplished this, and you can too.Key Takeaways:Excel si

2025-05-25 comment 0  369

Article Introduction：Operators in Java are basic tools for manipulating data, mainly including arithmetic operators, comparison operators, assignment and compound assignment operators, and logical operators. 1. The arithmetic operators include addition, subtraction, multiplication, division and balance, such as , -, *, /, %, where the integer division result is still an integer; 2. The comparison operator returns a Boolean value, such as ==, !=, >, =,

2025-06-27 comment 0  942

Article Introduction：The filter attribute of CSS allows direct application of visual effects, such as blur, color adjustment, etc. in the browser. The method of using it is to apply multiple filters to elements in sequence through chain syntax; common effects include background blur, image tone adjustment and shadow addition; attention should be paid to performance impact when using it, to avoid overuse or causing rendering problems on mobile devices.

2025-07-17 comment 0  377

Article Introduction：Adjustment layers are the core tool in PremierePro for non-destructive color tuning and batch processing. It itself is transparent and has no content, but it can add LumetriColor, curves and other effects and only works on the lower track. How to use it is: 1. Create a new adjustment layer in the project panel; 2. Drag it above the target track on the timeline and add a color palette plugin. Common practices include placing it on the top layer when uniform tone, controlling the influence range of crop length, and superimposing multiple layers for basic and local color adjustments. Notes include: 3. Adjust the layer order to determine the priority of the effect; 4. Some plug-ins need to be rendered before they take effect; 5. The exported color space should be consistent with the color tuning settings; 6. Use the blending mode carefully to avoid distortion. In addition, it can be quickly migrated by copying layers or parameters

2025-07-24 comment 0  623

Article Introduction：CSS' clamp() function realizes dynamic adjustment in responsive design by setting the minimum, preferred values ??and maximum values. It allows properties such as font size, spacing, etc. to smoothly adapt to different screen sizes. For example: font-size: clamp(1rem, 2.5vw, 2rem) means that the font is not less than 1rem on the small screen and not more than 2rem on the large screen, and 2.5vw is preferred for scaling. In addition, clamp() can also be used to control numerical properties such as inner margins and widths, such as padding: clamp(16px, 5%, 32px) to ensure that the inner margins maintain a reasonable range on different devices. Its browser support is good and is suitable for modern mainstream browsers. It is recommended to use it with relative units and

2025-07-01 comment 0  522

Article Introduction：Ten powerful jQuery Mobile plug-ins help you create an excellent mobile experience! These plug-ins are optimized and designed for mobile websites, covering many functions such as mobile sliding touch, mobile device detection, mobile browser inspection, mobile image library, mobile drag and drop, mobile touch scrolling, mobile Ajax calls, mobile CSS adjustment, and so on. Come and explore! Related readings: - 50 jQuery Mobile development tips - 10 jQuery iPhone style plug-ins - 10 sets of free mobile icon sets - 10 mobile demo websites jQuery SwipeGallery This lightweight plug-in is optimized for mobile websites and supports swipe operations. Just a few lines of H

2025-03-04 comment 0  579

Article Introduction：Layers are the core function in Photoshop for separating different parts of an image and editing independently. It is superimposed like transparent paper, supporting individual movement, adjustment of transparency and addition of effects, making it easy to design and modify flexibly. For example, text and background are processed separately. Common operations include creating a new layer (Shift Ctrl N), renaming, adjusting opacity, locking layers, and grouping management. In addition, layer styles such as shadows, gradients and blending modes (such as top-ups, color filters) can enhance the visual effect. It is recommended to name layers and use color labels to improve efficiency and collaboration.

2025-07-10 comment 0  196

Article Introduction：The usage methods of symbols in C language cover arithmetic, assignment, conditions, logic, bit operators, etc. Arithmetic operators are used for basic mathematical operations, assignment operators are used for assignment and addition, subtraction, multiplication and division assignment, condition operators are used for different operations according to conditions, logical operators are used for logical operations, bit operators are used for bit-level operations, and special constants are used to represent null pointers, end-of-file markers, and non-numeric values.

2025-04-03 comment 0  1468

Article Introduction：There are three main ways to convert date formats in PHP. 1. Use date and strtotime to combine to be suitable for simple conversion in standard formats, such as converting yyyy-mm-dd to dd-mm-yyyy; 2. Use the DateTime class to be suitable for handling complex scenarios such as addition and subtraction days or object-oriented style development; 3. Non-standard formats can be regularly extracted or introduced into third-party libraries such as Carbon to parse and format output.

2025-07-04 comment 0  408

Article Introduction：The new input types added to HTML5 include email, number, date, etc., which improve form interactivity and user experience, and have built-in verification functions. For example, type="email" automatically verifies the mailbox format and triggers the mobile email keyboard; type="number" limits digital input and supports up and down adjustment; type="date" provides calendar selection date; type="range" is used to slide to select numerical ranges; other such as url, tel, color, etc. also have specific uses, reducing the JavaScript verification needs.

2025-07-05 comment 0  571

Article Introduction：In order to improve the Python development efficiency in SublimeText, the following plug-ins are recommended: 1. Anaconda provides real-time error checking, automatic completion and code navigation functions; 2. SublimePythonIDE supports intelligent completion and formatting, and is more modern based on the LSP protocol; 3. The LSP package can connect to multiple Python language servers, which are flexible and consistent across languages; 4. SidebarEnhancements enhances file management functions, making it convenient to run scripts and create files. In addition, plug-ins such as BetterPython, DocBlockr, Terminal, and GitGutter have also improved the development experience.

2025-06-30 comment 0  449

Article Introduction：Docker is a lightweight virtual machine that simulates the environment required for applications to run, simplifying the process of running and deploying applications in different environments. It achieves environmental consistency through resource isolation and namespace management, as well as independent packaging of applications. In addition, Docker provides container image update function to achieve seamless upgrades. Despite limitations, Docker still plays a crucial role in microservice architecture, continuous integration and cloud-native applications through optimization (such as multi-stage construction and network policy adjustment).

2025-04-15 comment 0  718

Article Introduction：CSS's calc() function allows dynamic calculations in style sheets to implement responsive design. 1. Support addition, subtraction, multiplication and division operations, and there must be spaces on both sides of the operator; 2. Different units such as px, %, etc. can be mixed; 3. Applicable to scenarios such as adaptive width plus fixed margins, dynamic font size and grid layout spacing calculation; 4. Common errors include operators without spaces, nested use of calc(), etc. Mastering its basic structure and application can improve layout efficiency.

2025-07-18 comment 0  859

Article Introduction：When newbies learn Excel, they should start with basic operations and quickly solve daily problems. 1. Familiar with interface and cell operations, understand the row and column structure, input editing content, and adjust column width methods; 2. Master common formulas such as addition, subtraction, multiplication and division, and SUM, AVERAGE, MAX/MIN functions; 3. Use sorting and filtering functions to organize data to improve information organization; 4. Make bar charts, line charts, pie charts and other charts to achieve data visualization. Persist in practicing to gradually master daily use skills.

2025-07-20 comment 0  638

Article Introduction：The methods of using arithmetic operators in Go language include: 1. The basic operators , -, *, /, % are used for addition, subtraction, multiplication, division and separation, and taking the remainder. The result of integer division is an integer, and the division of negative numbers is rounded to zero, and the remainder only supports integers; 2. Self-increment and self-decrease - can only be used as independent statements on variables and cannot be used in expressions; 3. Mixed type operations require explicit conversion of types, and different types cannot be directly operated. For example, int and float64 must be converted to the same type first.

2025-06-21 comment 0  938