Found a total of 10000 related content
python static method example
Article Introduction：Use static methods when accessing instances or class properties is not required, which acts as a standalone helper function in the class for logically related but stateless operations. 1. The static method is decorated with @staticmethod and does not receive self or cls parameters; 2. It can be called directly through the class name without instantiation; 3. It is suitable for general logic such as tool functions or data verification, such as judging whether age is adult; 4. Unlike instance methods and class methods, static methods cannot access instances or class data; 5. The main advantage is to improve the organization and readability of the code, which is suitable for scenarios that do not depend on the state of the object.
2025-08-08
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221
How do I use the @classmethod decorator in Python?
Article Introduction：@classmethod is used in Python to define a class method that receives a class (cls) as the first parameter, not an instance (self), allowing it to access or modify class-level data or create instances. It is suitable for alternative constructors, handling class-level states, and implementing factory patterns. Unlike @staticmethod, the latter does not receive class or instance parameters. For example, you can use @classmethod to implement different object creation methods, such as initializing Person instances with full names. Additionally, @classmethod performs well in inheritance and will correctly pass its own class when called. When using it, make sure that the test class and instance call behavior are consistent and avoid overuse.
2025-06-27
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162
python descriptor protocol example
Article Introduction：The descriptor protocol controls attribute access by implementing the __get__, __set__ or __delete__ methods. 1. Define a class to implement the __get__, __set__ or __delete__ methods; 2. Use an instance of this class as a class attribute of another class; 3. Automatically trigger the corresponding method when accessing the attribute. For example, StringDescriptor ensures that the attribute is a string type, and calls __get__ when accessing, checks the type through __set__ when assigning, and calls __delete__ when deleting. The priority of data descriptor (implementation __set__) is higher than that of instance __dict__, and is often used in scenarios such as type verification, ORM fields, etc., using __dict
2025-07-25
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343
Use collections.ChainMap to implement deep dictionary merging
Article Introduction：This article explores how to implement deep dictionary merging using Python's collections.ChainMap. Standard ChainMap only provides shallow merging, that is, only the first value is taken when a duplicate key is encountered. For nested dictionary scenarios, we customize the DeepChainMap class and rewrite its __getitem__ method, so that it can recursively merge dictionary values under the same key, thereby implementing complex deep merging logic and effectively processing multi-layer nested data structures.
2025-08-11
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686
Implementing the Repository Pattern in Laravel.
Article Introduction：The purpose of implementing the Repository mode in Laravel is to decouple business logic and data access layer and improve code maintainability and scalability. 1. Create Interface and specific implementation classes; 2. Bind the interface to the implementation class through ServiceProvider; 3. Dependency injection interface in the Controller and call methods. Use the app/Repositories directory to store the UserRepositoryInterface and EloquentUserRepository examples, register the binding through the bind method, and access user data using dependency injection in the UserController. This mode is suitable for multiple data sources
2025-07-20
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815
C template example
Article Introduction：C template is the core mechanism for implementing generic programming. 1. Function templates are defined through template. For example, max functions can automatically deduce int, double, char and other types and return larger values; 2. Class templates allow creation of general classes, such as Pair can store and operate any data pairs of the same type, and support sum and other operations; 3. The template supports multiple type parameters, such as PairMixed can handle different types of combinations to achieve more flexible data structures; 4. Template definitions need to be placed in a header file for instantiation of the compiler, typename and class keywords are interchangeable, and the template parameters can be set to default values, such as Box. Combining vector and sort in STL, it can be seen that the template is C to achieve efficient
2025-08-26
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121
Using Eloquent API Resources in Laravel.
Article Introduction：EloquentAPIResources is a tool in Laravel for building structured JSON responses. 1. It serves as a conversion layer between the model and the output data; 2. It can control the return field, add additional fields, and unified format; 3. Create a Resource class through Artisan and define a toArray method; 4. Use newResource() or Resource::collection() to return data in the controller; 5. Usage techniques include avoiding deep nesting, preloading relationships, conditional return fields, custom paging and naming specifications. Rational use can improve the clarity and performance of the API.
2025-07-23
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963
Advanced data validation techniques in Laravel
Article Introduction：Laravel provides a variety of advanced data verification technologies, including encapsulating complex logic using custom rule objects, reusing verification rules using form requests, implementing conditional verification through sometimes methods, and uniqueness checking in combination with database rules. First, create a custom rule class through make:rule and define logic in passes() and message() methods, so complex verification such as age limit can be achieved; second, create a form request class using make:request to separate the verification logic and directly inject it into the controller to improve the code organization structure; third, call the sometimes() method to dynamically decide whether to verify a certain field based on the input value, which is suitable for dynamic forms
2025-07-02
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192
What is Laravel Livewire?
Article Introduction：The Livewire component is the basic unit for implementing dynamic front-end interactions in Laravel, which consists of PHP classes and Blade views. 1. PHP class processing logic, such as responding to events or updating data; 2. The Blade view is responsible for rendering HTML and binding interactive behavior. For example, when clicking the "Load More" button, you only need to define the corresponding method in the component to automatically complete AJAX requests and content updates. Common scenarios include: 3. Form verification and submission; 4. Real-time search suggestions; 5. Pagination or loading more; 6. Interactive actions such as likes and collections. The quick steps to get started are: 7. Install the livewire/livewire package through Composer; 8. Run phpartisanlivew
2025-07-21
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793
How to use templates in C
Article Introduction：Template is the core mechanism for implementing generic programming in C. It allows writing common code that can handle multiple types without repeatedly defining functions or classes. Its basic syntax defines type placeholders through template. Function templates such as max(Ta,Tb) can automatically deduce parameter types or explicitly specify them, and support multiple template parameters and auto return types. Class templates such as Array can build a general data structure with type and non-type parameters. Templates can be defined in header files to ensure instantiation at compile time and support full specialization to optimize specific type behaviors. However, specialization should be used with caution and overloading should be given priority. Concepts introduced by C 20 can constrain template parameter types to improve type safety. At the same time, you should pay attention to avoid code bloating caused by excessive instantiation.
2025-08-13
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422
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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903
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1516
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1115
