The settings.json file is located in the user-level or workspace-level path and is used to customize VSCode settings. 1. User-level path: Windows is C:\Users\\AppData\Roaming\Code\User\settings.json, macOS is /Users//Library/ApplicationSupport/Code/User/settings.json, Linux is /home//.config/Code/User/settings.json; 2. Workspace-level path: .vscode/settings in the project root directory

To correctly handle JDBC transactions, you must first turn off the automatic commit mode, then perform multiple operations, and finally commit or rollback according to the results; 1. Call conn.setAutoCommit(false) to start the transaction; 2. Execute multiple SQL operations, such as INSERT and UPDATE; 3. Call conn.commit() if all operations are successful, and call conn.rollback() if an exception occurs to ensure data consistency; at the same time, try-with-resources should be used to manage resources, properly handle exceptions and close connections to avoid connection leakage; in addition, it is recommended to use connection pools and set save points to achieve partial rollback, and keep transactions as short as possible to improve performance.

itertools.combinations is used to generate all non-repetitive combinations (order irrelevant) that selects a specified number of elements from the iterable object. Its usage includes: 1. Select 2 element combinations from the list, such as ('A','B'), ('A','C'), etc., to avoid repeated order; 2. Take 3 character combinations of strings, such as "abc" and "abd", which are suitable for subsequence generation; 3. Find the combinations where the sum of two numbers is equal to the target value, such as 1 5=6, simplify the double loop logic; the difference between combinations and arrangement lies in whether the order is important, combinations regard AB and BA as the same, while permutations are regarded as different;

DependencyInjection(DI)isadesignpatternwhereobjectsreceivedependenciesexternally,promotingloosecouplingandeasiertestingthroughconstructor,setter,orfieldinjection.2.SpringFrameworkusesannotationslike@Component,@Service,and@AutowiredwithJava-basedconfi

To participate in the Polkadot (DOT) ecosystem, you must first have a certified digital account. This article will provide you with a clear guide to help you quickly complete identity authentication (KYC) on mainstream platforms such as Ouyi OKX, Binance, Huobi HTX and Gate.io gates, and successfully start your Web3 exploration journey.

fixture is a function used to provide preset environment or data for tests. 1. Use the @pytest.fixture decorator to define fixture; 2. Inject fixture in parameter form in the test function; 3. Execute setup before yield, and then teardown; 4. Control scope through scope parameters, such as function, module, etc.; 5. Place the shared fixture in conftest.py to achieve cross-file sharing, thereby improving the maintainability and reusability of tests.

Choose"Custom:InstallWindowsonly(advanced)"forfullcontrol,asitallowsacleaninstallthatremovesoldissuesandoptimizesperformance.2.Duringsetup,managepartitionsbydeletingoldones(afterbackingupdata),creatingnewpartitions,formatting(usingNTFS),ors

Open Yandex browser; 2. Search for "Binance Official Website" and enter the official website link with "binance"; 3. Click the "Download" or mobile phone icon on the page to enter the download page; 4. Select the Android version; 5. Confirm the download and obtain the installation file package; 6. After the download is completed, click on the file and follow the prompts to complete the installation; you must always download through the official channel to avoid malware, pay attention to application permission requests, and regularly update the application to ensure security. The entire process requires careful identification of the official website and reject suspicious links, and finally successfully install the Binance app.