How to run python with notepad

Yes,aPythonclasscanhavemultipleconstructorsthroughalternativetechniques.1.Usedefaultargumentsinthe__init__methodtoallowflexibleinitializationwithvaryingnumbersofparameters.2.Defineclassmethodsasalternativeconstructorsforclearerandscalableobjectcreati

The key to using Python to call WebAPI to obtain data is to master the basic processes and common tools. 1. Using requests to initiate HTTP requests is the most direct way. Use the get method to obtain the response and use json() to parse the data; 2. For APIs that need authentication, you can add tokens or keys through headers; 3. You need to check the response status code, it is recommended to use response.raise_for_status() to automatically handle exceptions; 4. Facing the paging interface, you can request different pages in turn and add delays to avoid frequency limitations; 5. When processing the returned JSON data, you need to extract information according to the structure, and complex data can be converted to Data

Python's map() function implements efficient data conversion by acting as specified functions on each element of the iterable object in turn. 1. Its basic usage is map(function,iterable), which returns a "lazy load" map object, which is often converted to list() to view results; 2. It is often used with lambda, which is suitable for simple logic, such as converting strings to uppercase; 3. It can be passed in multiple iterable objects, provided that the number of function parameters matches, such as calculating the discounted price and discount; 4. Usage techniques include combining built-in functions to quickly type conversion, handling None situations similar to zip(), and avoiding excessive nesting to affect readability. Mastering map() can make the code more concise and professional

__post_init__ is used in Python's dataclass to run custom logic after object initialization. The problem it solves is that when you need to perform verification, calculate derivative properties or set internal state after field initialization, you do not need to manually rewrite __init__ and retain the initialization function automatically generated by dataclass. The usage method is to define the __post_init__ method, which Python will automatically call after the default __init__ is executed. Applicable scenarios include field verification, derivative attribute calculation and repeated logic avoidance. Not recommended for initialization that depends on external resources or overly complex. Notes include: __post_init__ does not accept parameters other than self

Function annotations are a feature used in Python to add metadata, which can improve code readability and maintenance. It does not force type checking, but provides type prompts or other information for parameters and return values. Its uses include: 1. Improve code readability and enable developers to clarify the expected input and output of functions; 2. Use it in conjunction with static type checking tools (such as mypy and pyright); 3. Used by frameworks (such as FastAPI) to generate documents or verify requests. Annotations do not affect the operation of the program. For example, name:str and ->str in defgreet(name:str)->str are only additional information, and the actual parameter transmission can still be of other types. Use suggestions include keeping the annotations concise and combining types and types

Notepad's "FindNext" function is used to repeatedly find the same keywords, which can avoid repeatedly opening the search window. Specific operations: 1. Press Ctrl F or click [Search]> [Find…] to open the search window; 2. After entering the keyword, click [FindNext] or press Enter to start the first search; 3. Click [FindNext] again to continue to find the next match. This function is suitable for checking the frequency of a word in a long document or manually replacing dispersed content. When using it, you need to pay attention to: case-sensitive, search from the cursor position by default, regular expressions are not supported, and prompts when not found. If you need to search from scratch, you should manually move the cursor to the beginning of the document. Mastering this function can improve text

Updating a JSON file requires three steps: reading, modifying, and writing. 1. Use json.load() to read the file into a Python data structure; 2. Access the modified value through keys such as data['age']=31 or nested modification; 3. Use json.dump(data,f) to save the changes back to the file and it is recommended to add indent to beautify the output. Before operation, you should confirm that the file exists and backups should be made if necessary. Remote data must be processed in conjunction with the requests module.

Using Python's multiprocessing module can improve performance, but attention should be paid to startup methods, Pool usage, process communication and exception handling. 1. Choose the appropriate startup method: fork (Unix fast but unstable), spawn (cross-platform recommendation), forkserver (property-suitable for frequent creation); 2. Use Pool to manage concurrent tasks, control the number of processes, and reasonably select map or apply_async; 3. Inter-process communication can be used to provide Queue, Pipe, Value, Array or Manager, pay attention to performance and security; 4. Strengthen exception handling, use logging to debug, and can be simulated by a single process during development.