This article explains the meaning and conventions of single and double leading, trailing, and surrounding underscores in Python identifiers, shows how name mangling works, and provides practical code examples illustrating their effects on classes, modules, and REPL usage.
This article explains practical Python implementations for reversing a linked list using iterative and recursive approaches, merging two or multiple sorted linked lists, handling edge cases such as empty inputs, and includes complete code samples with complexity analysis for each method.
This article explains Python's list comprehensions, demonstrates how to create and use generators for memory‑efficient iteration, compares iterators and iterable objects, and provides practical code examples including a generator‑based Fibonacci sequence, helping readers understand and apply these core concepts in their programs.
This article walks through practical Keras tutorials for image‑based traffic‑sign classification and text‑based sentiment analysis, covering data preparation, preprocessing, model construction, training, evaluation, deployment, and a concise comparison of Keras with TensorFlow and PyTorch.
This article explains how to combine Playwright with Python's unittest or pytest frameworks to build robust test suites, design data‑driven tests, run tests in parallel or distributed environments, and integrate the workflow into CI/CD pipelines such as GitHub Actions and Jenkins.
This article provides a step‑by‑step, code‑first guide to reproducing DeepSeek‑R1 from the ground up, covering model selection, dataset preparation, custom reward functions, GRPO reinforcement‑learning training, supervised fine‑tuning, reasoning‑oriented RL, rejection sampling, and model distillation.
This tutorial walks beginners through obtaining a DeepSeek API key, configuring a WeChat public account, setting up an Alibaba Cloud ECS instance, installing required dependencies, editing configuration files, and running the chatgpt‑on‑wechat project to enable AI‑powered replies via the WeChat platform.
This article shows how to transform a list of (letter, number) tuples into two independent lists using four different Python approaches—including basic loops, zip unpacking, pandas, and numpy—complete with code examples and output screenshots.
This article explains how to use Playwright with Python to automate complex web interactions such as multi‑page navigation, new‑tab handling, alert/confirm/prompt dialogs, scrolling, drag‑and‑drop, and browser history manipulation, providing clear code examples for each scenario.
This article introduces eight Python GUI frameworks—including Tkinter, PyQt5, PySimpleGUI, Kivy, wxPython, Toga, Dear PyGui, and Streamlit—explaining their features, providing code examples, and offering a small exercise to create a simple calculator, helping developers quickly build desktop apps.
This guide introduces nine powerful Python libraries—Rich, Pillow, PyAutoGUI, python‑dotenv, schedule, tqdm, loguru, fake‑useragent, and PySimpleGUI—detailing their key features and providing code examples to help developers dramatically reduce development time and avoid reinventing common functionality.
This article demonstrates how to use Playwright for UI automation by showing how to fill various form fields, upload and download files, simulate keyboard shortcuts and combinations, and handle form validation and errors, providing complete Python code examples for each scenario.
This article walks through a Python data‑analysis task where a user wants to count how many teachers come from each country, demonstrating two solutions with pandas—using the merge() function and the join() method—complete with code snippets and step‑by‑step explanations.
This guide walks you through setting up a local DeepSeek large language model, covering environment preparation, model acquisition, dependency installation, FastAPI service creation, Docker containerization, optional front‑end interface, performance tuning, and common troubleshooting steps.
This tutorial walks you through creating a basic Playwright project in Python, demonstrates how to open web pages, retrieve titles, perform navigation and interactions, and explains the differences between Playwright's synchronous and asynchronous APIs.
This article demonstrates how to use Python's requests library and regular expressions to scrape Baidu search result titles and URLs, save them to a CSV file, and suggests alternative parsers like XPath or BeautifulSoup for further extraction.
This article introduces Playwright, explains its key features, guides readers through installing the tool and its dependencies, demonstrates how to launch Chromium, Firefox, and WebKit browsers with Python code, and shows common configuration options such as headless mode, timeouts, and proxy settings.
This article explains how to structure Python projects so that configuration is managed through packages and environment variables, enabling seamless deployment across development, testing, staging, and production environments without code changes, while illustrating best practices with clear examples and code snippets.
This article introduces essential Python built‑in functions such as map, filter, reduce, sorted, any, all, zip, enumerate, and utilities from functools, itertools, and operator modules, providing concise explanations and practical code examples for each to help readers master fundamental programming techniques.
This article explains why Python’s Global Interpreter Lock limits CPU core usage, introduces the multiprocessing module for parallel execution of CPU‑intensive tasks, and provides step‑by‑step code examples, key concepts, synchronization tools, a real‑world image‑processing case, and best practices to dramatically speed up your programs.
Learn how to scrape Baidu search result titles and URLs using Python's requests library and lxml's xpath parsing, complete with a ready-to-run script, CSV output, and step-by-step explanation that builds on earlier regex and BeautifulSoup methods.
This article presents thirteen practical Python project ideas for intermediate developers, covering web scrapers, URL shorteners, regex tools, note‑taking apps, quizzes, media players, alarm utilities, file managers, accounting tools, address books, site checkers, bulk renamers, and directory tree generators, each with technical details and optional challenges.
This article provides a comprehensive overview of Python's core date and time handling modules, including datetime, time, calendar, dateutil, and zoneinfo, with practical examples and installation instructions for advanced functionality.
This article summarizes a meetup talk by Alibaba Cloud expert Yu Deshui, detailing MaxCompute’s evolution, serverless architecture, AI‑enabled features, and the platform’s comprehensive solutions—including OpenLake, MaxFrame, Object Table, near‑real‑time computing, and AI Functions—to address the challenges of modern data‑centric AI workloads.
This article walks through setting up a local Retrieval‑Augmented Generation (RAG) system using the open‑source DeepSeek‑R1 model run via Ollama, covering installation, model selection, PDF ingestion with LangChain, semantic chunking, FAISS vector store creation, RetrievalQA chain construction, and a Streamlit UI for querying.
This tutorial explains e‑commerce web scraping fundamentals, covering definitions, tool types, data categories, step‑by‑step Python script creation with Requests, BeautifulSoup, and Selenium, provides sample code for Amazon, Walmart, and eBay, discusses challenges like dynamic pages and anti‑scraping measures, and recommends using specialized scraping APIs.
Discover the ten most essential VS Code extensions for Python that boost productivity, improve code quality, and streamline debugging, covering everything from intelligent code completion and formatting to version control insights and Jupyter notebook integration.
This article introduces PyTorch, explains its dynamic computation graph, Python‑centric design, and tensor operations, surveys its major applications in computer vision, natural language processing, and reinforcement learning, and provides a step‑by‑step tutorial for building and training a multilayer perceptron on the MNIST dataset.
This article presents twenty practical Python scripts that automate everyday tasks such as batch file renaming, email sending, scheduling reminders, generating reports, backing up files, updating Excel sheets, downloading web pages, filling forms, extracting PDF text, converting file formats, visualizing data, and more, providing ready-to-use code examples for each.
HighService, Alibaba’s Pythonic AI service framework, accelerates large‑model inference and maximizes GPU utilization by separating CPU‑GPU processes, offering out‑of‑the‑box quantization, parallelism and caching, and dynamically reallocating idle GPUs across clusters through a master‑worker scheduler to keep online latency low while boosting offline throughput for diffusion and LLM workloads.
This tutorial showcases a comprehensive set of pandas techniques—including reading data from the clipboard, random sampling, multi‑condition filtering, handling missing values, string splitting, list expansion, multi‑function aggregation, slicing, descriptive statistics, categorical conversion, DataFrame styling, and profiling—to efficiently explore and transform DataFrames in Python.
This article explains Python tuples as immutable sequence types, covering their characteristics such as immutability, multiple return values, unpacking, use as dictionary keys, iteration, performance benefits, and practical examples to help write clearer and safer code.
This guide walks you through installing Ollama, pulling the open‑source DeepSeek R1 model, and using LangChain and Streamlit to create a locally hosted Retrieval‑Augmented Generation (RAG) system that can answer questions from uploaded PDFs without any cloud API.
This article introduces TensorFlow's core concepts—tensors, computational graphs, variables, and sessions—covers its wide range of AI applications from traditional machine learning to deep learning in NLP and computer vision, and provides a step‑by‑step Python tutorial for implementing a simple linear regression model.
This article provides a concise tutorial on Python's standard library modules for interacting with the operating system and handling files, covering os, os.path, shutil, glob, pathlib, io, tempfile, fileinput, pickle, csv, zipfile, and tarfile with example code snippets.
This article explains how to replicate Deepseek RI's slow‑thinking inference using the GRPO reinforcement‑learning algorithm on the Qwen2.5‑7B model in a free Colab notebook, covering the underlying COT concept, reward‑function design, data preparation, training configuration, and observed results.
This article explains various Python sorting techniques—including the built‑in sorted() function, the in‑place list.sort() method, key‑based sorting for complex structures, multi‑criteria ordering, and custom comparison via functools.cmp_to_key—providing clear code examples for each approach.
This article introduces Python’s os, sys, and os.path modules, demonstrating how to retrieve the current working directory, create and delete directories, list files, execute system commands, access interpreter information, handle command‑line arguments, redirect I/O, and manipulate file paths with practical code snippets.
A recent Azul Systems study suggests that Java may surpass Python in enterprise AI development within the next 18‑36 months, highlighting Java's scalability, performance, and emerging GPU projects while acknowledging cultural and tooling advantages that still favor Python.
Tiler is an open‑source Python project that automatically assembles small graphic elements—such as LEGO bricks, emojis, or custom icons—into large pixel‑art mosaics, offering configurable depth, rotation, color palette, and tile size to produce artworks like Van Gogh's Starry Night or Minecraft‑style scenes.
This tutorial guides beginners through the complete process of integrating DeepSeek's large language model API into a WeChat public account, covering API key acquisition, WeChat platform configuration, free Alibaba Cloud ECS setup, code deployment, dependency installation, configuration file editing, and final server verification.
This comprehensive tutorial introduces Python fundamentals, covering print statements, variable definition and assignment, data type conversion, conditional and loop structures, function creation and invocation, input handling, comments, indentation rules, program exit methods, operators, slicing, collections, file I/O, exception handling, and module imports.
This article presents fifteen practical Python scripts that automate everyday tasks such as folder backup, email notifications, web content downloading, password management, image downloading, Excel processing, network speed testing, social media posting, scheduled shutdown, CPU monitoring, HTML scraping, batch file renaming, duplicate removal, text‑to‑speech conversion, and PDF merging.
Learn a collection of Python scripts that automate common Excel operations—including merging multiple files, find‑and‑replace, filtering rows, adding formulas, adjusting formats, extracting images, and encrypting workbooks—providing step‑by‑step code examples for efficient data processing.
Based on the 2025 PYPL popularity index and TIOBE rankings, this article examines the top programming languages—such as Python, JavaScript, Java, TypeScript, PHP, C#, Rust, Go, Kotlin, and Swift—detailing their descriptions, key features, primary uses, and current popularity trends.
This article provides a collection of practical Python snippets demonstrating how to send GET and POST requests, validate status codes, response bodies, JSON schemas, handle headers, query parameters, file uploads, redirects, timeouts, sessions, authentication, rate limiting, and parameterized testing using the requests library and pytest framework.
This article explains the limitations of using print() for debugging Python code and demonstrates how the IceCream library’s ic() function provides richer, more organized output, supports assignment, visualizes complex data structures, and offers configurable logging features.
This article presents four practical methods—using list slicing, Excel split, pandas apply with lambda, and custom code—to efficiently split template strings and extract data in Python, highlighting code examples and tips for handling cases without commas.
This guide explains how to use Locust to add query parameters to GET requests and send JSON or form‑encoded data in POST requests, including combined examples with custom headers for comprehensive HTTP request configuration.
Learn what Python generators are, see a simple countdown example, and discover four typical pitfalls—unnecessary use, exhaustion, misuse in list comprehensions, and improper yield placement—along with practical fixes to help you apply generators correctly in real-world code.
This article provides a comprehensive overview of Python's built‑in data types—including numbers, strings, lists, tuples, dictionaries, sets, booleans, None, sequences, mappings, iterables, and file handling—explaining their characteristics, usage examples, and best‑practice considerations for efficient programming.
The Next Permutation problem asks to rearrange an integer array into the immediate lexicographically larger ordering—or the smallest order if none exists—by scanning from the right to find the first decreasing pair, swapping with the next larger element, and reversing the suffix, using O(1) extra space, with implementations provided in Java, C++, and Python.
This guide explains how to leverage Locust's built‑in statistics and reporting features to monitor HTTP requests in real time via its web UI, export results as CSV files, customize metric collection in scripts, and analyze the data with external tools.
This article explains how to implement exception handling in Locust to ensure robust test scripts that can handle network timeouts, request failures, and other exceptions effectively.
This guide walks you through the hardware and software prerequisites, Docker-based installation, environment configuration, model fine‑tuning, IDE integration, maintenance, and troubleshooting for running the DeepSeek AI programming assistant entirely on your own machine.
This article demonstrates how to use Python's standard file handling libraries within Locust load‑testing scripts to read, write, and upload files, including example code, best‑practice tips, exception handling, and concurrency considerations for reliable file operations during performance testing.
This guide explains how to integrate multiple custom clients in Locust, covering the definition of client classes for HTTP and WebSocket, their use within a user class, configuration of run parameters, and important considerations such as resource management and exception handling.
This article walks through a Python community question by presenting two clear approaches—renaming columns to match and using NumPy addition—to sum corresponding columns from two tables, complete with visual code examples and a brief discussion on handling mismatched headers.
The article explains Locust's event system, detailing common events such as init, test_start, test_stop, request_success, request_failure, quitting, worker_report, and hatch_complete, and provides Python code examples for attaching listeners to customize load‑testing behavior.
LeetCode 57 asks you to insert a new interval into a sorted list of non‑overlapping intervals, merging any overlaps so the result stays sorted and disjoint, and the article explains the O(n) algorithm and provides concise implementations in Java, C++ and Python.
Learn what Python lambda functions are, their concise syntax, historical roots, practical examples for sorting, filtering, mapping, and reducing data, and understand when to prefer regular functions for readability and complex logic.
This article examines a Python function overloaded with flags, explains why such design harms readability, testability, and extensibility, and demonstrates step‑by‑step refactoring using descriptive helper functions, a pipeline approach, flexible step lists, and type annotations to produce clean, maintainable code.
This article walks through a Python fan's data‑processing question, showing two practical ways to align column names and add two DataFrames—one by renaming columns and using direct addition, the other by leveraging NumPy before converting back to a DataFrame.
This guide demonstrates how to add WebSocket support to Locust by installing the websockets library, creating a custom WebSocket client class, defining user tasks, handling connection events, and running the load test against a WebSocket server.
This guide explains Python asynchronous programming using the asyncio library, covering async functions, coroutine objects, the event loop, await syntax, task creation, and concurrent execution with asyncio.run, create_task, and gather to improve I/O‑bound performance.
This guide explains how to install Locust, write a Python test script, launch the tool, configure load parameters, analyze real‑time results, and explore advanced features such as custom clients and distributed testing for web performance evaluation.
This article introduces the open‑source HttpRunner API testing tool, outlines its key features such as YAML/JSON test definitions, parameterization, assertions, reporting and performance testing, and provides step‑by‑step Python examples showing how to write, run, and integrate HttpRunner tests with existing requests‑based projects.
This article explains a Python fan's question about summing each column of a two‑dimensional list and presents three concise solutions—including list unpacking with zip, NumPy aggregation, and a functional reduce approach—complete with code snippets and explanations.
This article demonstrates how to use Python, OpenCV, and Pillow to programmatically generate frames that depict the gradual opening of cherry blossoms, assemble them into a video, and share the result as a timelapse celebrating Wuhan University's spring scenery.
This article introduces the PyUserInput library, explains how to install platform‑specific dependencies, demonstrates basic mouse and keyboard control with code examples, and shows a practical script that automates a login process by moving the cursor, typing credentials, and clicking buttons.
This article explains the Python built-in functions globals() and locals(), which return dictionaries of global and local symbol tables, respectively, detailing their usage in debugging, dynamic code execution, and metaprogramming.
This guide walks you through setting up a personal DataWorks Notebook, performing interactive SQL development with engines like MaxCompute, creating Python visualizations, building ipywidgets for dynamic queries, and leveraging the AI‑powered Copilot to rewrite, explain, and comment code, all within a unified big‑data platform.
This article introduces twelve advanced Python features—including generators, context managers, metaclasses, descriptors, coroutines, data classes, type annotations, multiple inheritance with mixins, exception chaining, modules and packages, itertools, and regular expressions—explaining their purpose and providing clear code examples to illustrate each concept.
This tutorial explains how to use Python 3 with Requests, lxml, and Baidu's AipFace SDK to crawl images from Zhihu's "美女" topic, filter them by face detection, gender, authenticity, and beauty score, and store the qualified pictures locally.
This article provides a comprehensive, step‑by‑step guide to Microsoft AutoGen 0.4, explaining its layered architecture, core concepts such as Agent, Runtime, and Agent ID, and demonstrating both a simple Hello‑World multi‑agent example and an AI‑enabled agent with full Python code snippets.
This article presents a concise tutorial on essential Python data science libraries, covering data cleaning with Pandas, numerical analysis with NumPy and SciPy, visualization with Matplotlib and Seaborn, machine learning with scikit‑learn, NLP with NLTK and spaCy, time‑series modeling, image processing, database access, and parallel computing, each illustrated with ready‑to‑run code examples.
This article demonstrates five pandas-based methods for extracting unique date‑hour records from an Excel file, explaining how to drop duplicates, reset minutes and seconds, floor timestamps, reformat dates, and use openpyxl for custom extraction.
Learn how to dramatically improve Python's speed and reduce memory usage when handling massive datasets by applying ten practical techniques—including optimal data structures, chunked file reading, generators, powerful libraries, parallel processing, memory-mapped files, databases, streaming frameworks, cloud services, and algorithmic optimizations.
This article walks through a real‑world Python question about extracting numeric work‑experience values from a CSV column, presenting four distinct regex‑based solutions with complete code snippets, visual results, and a concise summary for data‑analysis practitioners.
This article explains Python's built‑in exec() function, covering its syntax, parameter options, practical code examples, security considerations, performance impacts, and recommended best‑practice guidelines for safely using dynamic code execution.
This article demonstrates how to replace common Excel operations such as VLOOKUP, data pivot tables, and charting with Python's pandas and plotly libraries, providing code examples, explanations of data import/export settings, and performance considerations for large‑scale data analysis.
This article presents ten ready‑to‑use Python automation scripts that demonstrate how to optimize images, process videos, convert PDFs to images, fetch and post API data, monitor battery levels, correct grammar and spelling, download files, retrieve world news, and build a simple PySide2 GUI, providing clear code examples for each use case.
From its 1960s origins as an accessible beginner’s language to its ubiquitous presence on early home computers, BASIC paved the way for today’s Python, which the author argues has become the new BASIC for non‑programmers, despite its quirks and evolving ecosystem.
This article explains the LeetCode 31 "Next Permutation" problem, provides a detailed analysis of the algorithmic approach, and presents complete in‑place solutions in Java, C++, and Python, along with constraints and example cases.
This article introduces Python's object‑oriented programming fundamentals, explaining how to define classes, instantiate objects, differentiate class and instance attributes, and use various method types, followed by practical examples of inheritance, polymorphism, and encapsulation to build well‑structured, maintainable code.
This article explores six frequently misunderstood Python features—mutable default arguments, the difference between is and ==, *args/**kwargs, iterator exhaustion, complex list comprehensions, and the global keyword—explaining why they trip developers up and offering clear, practical solutions to master each one.
Python comprehensions provide concise syntax for creating lists, sets, dictionaries, nested structures, and generator expressions, allowing developers to replace explicit loops and conditional logic with readable one‑liner constructs, as illustrated with practical code examples and guidance on their appropriate use.
This article provides a step‑by‑step guide to learning Python data structures, covering basic concepts, built‑in types, hands‑on practice, advanced structures, algorithm relationships, resources, community engagement, and continuous self‑challenge to improve problem‑solving skills.
This article introduces ten essential Python libraries—including SciPy, Matplotlib, Plotly, Scikit‑learn, TensorFlow, spaCy, BeautifulSoup, OpenPyXL, Feather/Parquet, and SQLAlchemy—detailing their primary uses for scientific computing, visualization, machine learning, deep learning, NLP, web scraping, Excel handling, efficient data storage, and ORM, with practical code examples.
This article demonstrates how to build a Python GUI application that scans nearby Wi‑Fi networks, reads a password dictionary, and attempts to brute‑force Wi‑Fi credentials using the pywifi library, providing step‑by‑step code, environment setup, and execution results.
This article reviews seven widely used Python web frameworks—Django, Flask, Scrapy, Tornado, Web2py, Weppy, and Bottle—detailing their main features, advantages, and drawbacks to help developers choose the most suitable tool for their projects.
The article outlines twelve essential characteristics of Python's syntax—including indentation, dynamic typing, built‑in data structures, standard library, OOP support, exception handling, generators, decorators, and more—illustrated with clear code examples that demonstrate how these features simplify development and improve code readability.
This article compares Python's list comprehensions and generator expressions, highlighting differences in memory usage, execution timing, reusability, suitable scenarios, and how to convert each into other sequence types, with clear code examples for each point.
This article walks through ten practical techniques—including profiling with cProfile, using built‑in functions, list comprehensions, avoiding globals, leveraging NumPy, generators, multiprocessing, caching, selective imports, and upgrading Python—to dramatically accelerate Python scripts handling large data sets.
This article explains five essential Python functions for object inspection and type checking: type(), isinstance(), getattr(), hasattr(), and best practices for error handling.
This article explains how to define functions in Python, covering the def syntax, various parameter passing methods—including positional, default, keyword, *args, and **kwargs—and how to return single or multiple values, illustrated with clear code examples and a comprehensive calculate_area demonstration.
This article provides ten self‑contained PyQt5 examples—including a simple window, button counter, text input, checkbox, combo box, file dialog, progress bar, label, table view, and calendar widget—each with full Python code and brief explanations for building desktop GUI components.
This article introduces several common image file formats such as BMP, PNG, JPEG, TIFF, WebP, and others, explains their typical use cases, and provides Python OpenCV code snippets for reading, displaying, and saving images in each format.
This guide demonstrates how to create a robust online webpage screenshot service using Python, Selenium, and Flask, incorporating security measures like CSRF protection and domain whitelisting, performance enhancements with Redis caching and rate limiting, comprehensive error handling, resource management, and extensibility for future features.
This article provides a comprehensive guide on developing a Python tool to convert English videos into versions with Chinese dubbing and subtitles, covering all steps from audio extraction to final synthesis.
