Ethereum is a decentralized application platform based on smart contracts, and its native token ETH can be obtained in a variety of ways. 1. Register an account through centralized platforms such as Binance and Ouyiok, complete KYC certification and purchase ETH with stablecoins; 2. Connect to digital storage through decentralized platforms, and directly exchange ETH with stablecoins or other tokens; 3. Participate in network pledge, and you can choose independent pledge (requires 32 ETH), liquid pledge services or one-click pledge on the centralized platform to obtain rewards; 4. Earn ETH by providing services to Web3 projects, completing tasks or obtaining airdrops. It is recommended that beginners start from mainstream centralized platforms, gradually transition to decentralized methods, and always attach importance to asset security and independent research, to

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

The failure to register a Binance account is mainly caused by regional IP blockade, network abnormalities, KYC authentication failure, account duplication, device compatibility issues and system maintenance. 1. Use unrestricted regional nodes to ensure network stability; 2. Submit clear and complete certificate information and match nationality; 3. Register with unbound email address; 4. Clean the browser cache or replace the device; 5. Avoid maintenance periods and pay attention to the official announcement; 6. After registration, you can immediately enable 2FA, address whitelist and anti-phishing code, which can complete registration within 10 minutes and improve security by more than 90%, and finally build a compliance and security closed loop.

The choice of mainstream coin-playing software in 2025 requires priority to security, rates, currency coverage and innovation functions. 1. Global comprehensive platforms such as Binance (19 billion US dollars in daily average, 1,600 currencies), Ouyi (125x leverage, Web3 integration), Coinbase (compliance benchmark, learning to earn coins) are suitable for most users; 2. High-potential featured platforms such as Gate.io (extremely fast coins, trading is 3.0), Kucoin (GameFi, 35% pledge income), BYDFi (Meme currency, MPC security) meet the segmentation needs; 3. Professional platforms Kraken (MiCA certification, zero accident), Bitfinex (5ms delay, 125x leverage) service institutions and quantitative teams; suggest

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.

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;

Laravel's error and exception handling mechanism is based on the PHP exception system and Symfony component, and is managed uniformly by the App\Exceptions\Handler class. 1. Record exceptions through the report() method, such as integrating Sentry and other monitoring services; 2. Convert exceptions into HTTP responses through the render() method, supporting custom JSON or page jumps; 3. You can create custom exception classes such as PaymentFailedException and define their response format; 4. Automatically handle verification exception ValidationException, and manually adjust the error response structure; 5. Decide whether to display details based on the APP_DEBUG configuration.

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