This guide explains the limitations of ARIMA‑type models for handling changing variance, introduces ARCH and GARCH as solutions, and walks through Python implementations—including data generation, model fitting, and forecasting—complete with code snippets and visualizations.
Security firm Trellix warns that the 15-year-old CVE-2007-4559 directory-traversal flaw in Python’s built-in tarfile module remains unpatched, potentially allowing attackers to execute arbitrary code on any system using Python, and affecting an estimated 350,000 open-source projects across diverse domains.
This guide walks you through installing Matplotlib, importing it with NumPy, and using its pyplot interface to create line, scatter, bar, histogram, pie, and box plots, complete with code examples and visual results for effective data visualization.
This article examines several confusing behaviors in Python—including implicit variable declarations, mutable default arguments, class variable inheritance, scope rules, and list‑modification during iteration—illustrating each with code examples and offering practical solutions for developers.
This article explains the technical principles and implementation steps of web crawlers, introduces common crawling frameworks, provides a Python example for extracting app store rankings, and then details various anti‑crawling methods such as CSS offset, image camouflage, custom fonts, dynamic rendering, captchas, request signing, and honeypots, followed by counter‑strategies for each.
This article explains the motivations behind Monte Carlo methods, introduces acceptance-rejection sampling, details Markov Chain Monte Carlo concepts, and walks through Metropolis-Hastings and Gibbs sampling algorithms with Python implementations, highlighting their use in high‑dimensional probability distribution sampling.
This guide explains how to use scikit-learn’s SimpleImputer and KNNImputer to fill missing values, covering available strategies such as mean, median, most frequent, and constant, and provides complete Python code examples with expected output.
This article demonstrates how the Taichi library can speed up a Python prime‑counting program by roughly two hundred times compared to the unoptimized version and five times faster than using Numba, providing clear code examples and performance results.
This tutorial walks beginners through deploying a Django application on a fresh Linux server using the BT (BaoTa) panel, covering security‑group port opening, software installation, Python environment setup, uWSGI and Nginx configuration, static file handling, and common troubleshooting steps.
This tutorial explains what a dragon curve fractal is, how it can be constructed by iterative paper folding, and provides step‑by‑step Python code—including sequence generation and Turtle graphics—to draw both straight‑line and circular versions of the curve.
This article formulates the daily flower inventory problem as a stochastic decision model with Poisson‑distributed demand, derives the optimal order quantity analytically, and validates it through Python simulations that compute expected profit for varying order levels.
This tutorial explains how to use PyMC3 for Bayesian linear regression, covering model definition, data simulation, MAP estimation, advanced MCMC sampling with NUTS, and posterior analysis, all illustrated with complete Python code examples.
This article provides a step‑by‑step guide to building an online blog platform using Flask and MySQL, covering environment setup, database schema design, user registration and login, password encryption, CRUD operations for posts, Markdown editing, image upload, comment management, and error handling with full code examples.
This guide explains how to launch Jupyter Notebook, open existing notebook files, and begin working with them, providing clear step‑by‑step instructions for users new to the interactive computing environment, including tips on navigating the interface and saving your work.
This article walks through a community‑sourced solution for reshaping a nested Python list into a cleaner structure, presenting multiple approaches, detailed code snippets, and visual examples that illustrate how to extract and reorganize list elements effectively.
This article walks through a community‑raised Python list‑merging question, explains why zip and join are ideal for combining two equal‑length lists, provides clean example code, shows the expected output, and highlights the usefulness of the zip() function for similar tasks.
This article introduces the GM(2,1) grey model, presents its definitions and theorem, walks through a step‑by‑step case study with data preparation, parameter estimation, solution of the differential equation, and shows how to implement the whole process in Python with code examples and error analysis.
This article demonstrates how to analyze and visualize time‑series sensor data in Python using libraries such as NumPy, Pandas, Matplotlib, Seaborn and Scikit‑learn, covering data import, preprocessing, mean‑std plots, boxplots, Fourier transforms, entropy calculation, PCA dimensionality reduction and autocorrelation analysis.
The article explains web‑crawling basics, Python and Scrapy examples, then surveys common anti‑crawling defenses such as CSS offsets, image camouflage, custom fonts, dynamic rendering, captchas, request signatures and honeypots, and finally presents anti‑anti‑crawling countermeasures—including CSS‑offset reversal, font decoding, headless‑browser rendering and YOLOv5‑based captcha cracking, while stressing legal compliance.
This article walks through a real Python Selenium web‑scraping issue, shows the error screenshots, explains why the script fails when the page isn’t fully rendered, and provides a reliable code solution along with practical tips for avoiding similar problems.
From the early days of COBOL and Fortran to modern languages like TypeScript, Rust, and Go, this essay reviews the evolution of programming languages, discusses criteria for selecting a language, and recommends the most versatile and powerful options for developers in 2022.
This article introduces seven lesser‑known but highly useful Jupyter Notebook extensions—voila, nbdime, RISE, bokeh, nbgrader, jupytext, and jupyterlab‑git—detailing their features, GitHub popularity, and how they can transform notebooks into interactive web apps, version‑controlled documents, slides, visualizations, grading tools, and more.
This article introduces four advanced Python data‑visualization methods—heat map, 2D density plot, spider (radar) plot, and hierarchical tree diagram—explaining their concepts, practical use cases, and providing complete seaborn, matplotlib, and SciPy code examples for each.
This article explains how to design part calibration values and tolerances for a product composed of seven components, models the relationship between component parameters and product quality, and uses a Monte Carlo simulation in Python to estimate the average loss per product, illustrating the trade‑off between quality loss and manufacturing cost.
This guide demonstrates how to perform multiple linear regression in Python using sklearn's LinearRegression and the statsmodels library, covering data preparation, model fitting, coefficient extraction, prediction, and detailed statistical diagnostics with example cement heat data.
This article walks you through the fundamentals of data governance, explains metadata management concepts, compares traditional tools with DataHub, and provides a step‑by‑step tutorial for installing Docker, Python, and DataHub 0.8.20 on CentOS 7, ingesting MySQL metadata, and exploring the UI.
This article outlines nine key advantages of Python over Matlab—including cost, open‑source nature, growing community, broader functionality, cross‑platform support, dominance in machine learning, flexibility, diverse IDE options, and cleaner code—providing a comprehensive guide for anyone choosing a modeling tool.
This guide explains how to configure email account credentials, connect to an SMTP server, construct plain‑text, HTML, and attachment‑based messages using Python's smtplib and email libraries, and send them, with step‑by‑step code examples for each scenario.
This guide explains what residential proxy IPs are, their advantages, how to obtain them from services like IPIDEA, and provides step‑by‑step Python code examples for integrating proxies into web‑scraping tasks such as extracting Amazon product data.
This article explains the principles of single and double exponential smoothing, shows how to choose the smoothing coefficient, demonstrates forecasting with Python code on product price and steel production data, and compares prediction errors to select the optimal model.
This article introduces ten powerful Python libraries—including Awkward Array, Jupytext, Gradio, Hub, AugLy, Evidently, YOLOX, LightSeq, Greykite, and Jina/Finetuner—highlighting their key features, performance benefits, and where to find them, offering developers essential tools for data handling, model deployment, and AI research.
This article presents a collection of thirty Python quiz questions, each accompanied by the correct answer and thorough explanations that illustrate language quirks, operator behavior, iteration nuances, scope rules, generators, dataclasses, and function signatures for developers seeking deeper Python knowledge.
A real‑world incident at Digg shows how using a mutable default argument in a Python function caused a cascade of performance problems, leading to a rushed v4 release, service outages, and ultimately the company's decline and acquisition.
The article recounts Digg's disastrous v4 launch, highlighting how a seemingly harmless Python default‑argument bug combined with rushed deployment, missing rollback plans, and external pressures led to massive performance failures, costly fixes, and ultimately the company’s decline and acquisition.
This article explains the origins and core concepts of factor analysis, outlines its algorithmic steps, demonstrates how to perform the analysis using Python's factor_analyzer library—including data preparation, adequacy tests, eigenvalue selection, rotation, and visualization—culminating in extracting new latent variables.
This article provides a comprehensive, visual guide to essential Pandas operations—including sorting, column selection, grouping, multi‑aggregation, filtering, dropping, joining, merging, pivot tables, melting, stacking, unstacking, and index manipulation—illustrated with clear code examples for data analysis in Python.
This article explains the core PSO velocity and position formulas, provides a complete Python implementation with detailed comments, runs the algorithm on a 2‑dimensional test function, and presents the optimal solution and convergence plot.
This guide shows how to deploy a Python‑based image‑to‑sketch function on Alibaba Cloud Serverless Function Compute, automatically converting photos uploaded to one OSS bucket into sketch images stored in another bucket, covering prerequisites, environment setup, code implementation, deployment steps, testing, and troubleshooting.
This article introduces the most popular Python libraries for image processing—including scikit‑image, NumPy, SciPy, Pillow, OpenCV, SimpleCV, Mahotas, SimpleITK, pgmagick, and Pycairo—explains their core features, and provides concise code snippets demonstrating tasks such as filtering, template matching, masking, blurring, and visualisation.
This article introduces the multimodal Rastrigin function, explains its challenges for optimization, and demonstrates a complete Python implementation of a genetic algorithm—including encoding, selection, crossover, mutation, and decoding—to locate the function’s global minimum, with visual results and performance analysis.
This article provides a comprehensive overview of PyMuPDF, the Python binding for the lightweight MuPDF library, detailing its core features, installation steps, and practical code examples for opening documents, extracting metadata, rendering pages, manipulating PDFs, and performing advanced operations such as merging, splitting, and saving files.
This article demonstrates how to use Python's requests and lxml libraries to scrape web pages and apply regular expressions for extracting both integer and floating‑point numbers, providing clear code examples and step‑by‑step explanations.
The Rastrigin function, a challenging multimodal benchmark used to test optimization algorithms, is explained with its mathematical form, visual plot, and a complete Python implementation for generating and visualizing its landscape.
Learn how to generate 3D line, scatter, and surface visualizations in Python using Matplotlib's mplot3d toolkit, with step-by-step code examples that create a canvas, produce data arrays, and render interactive plots for enhanced data analysis and presentation.
This guide explains how to use ANSI escape sequences, 16‑color and 256‑color schemes, and the Python Colorama library to produce colored, highlighted, and styled text in terminal applications, complete with code examples and visual illustrations.
This article compares Ruby and Python as high‑level, object‑oriented languages for web development, outlining their histories, core features, popular frameworks, performance statistics, and suitability for different project needs to help developers choose the right tool.
This guide explains how to reliably manage Python project dependencies and environments using pip tools (pip list, pip freeze, pipdeptree, pip‑autoremove) and Conda (installation, virtual environments, environment export/import, IDE integration), helping you avoid common pitfalls as projects scale.
This guide demonstrates how to perform asynchronous CRUD operations on MySQL, PostgreSQL, and Redis using Python libraries such as aiomysql, asyncpg, and SQLAlchemy, covering connection setup, querying, inserting, updating, deleting, and handling result objects with practical code examples.
This tutorial shows how to write a lightweight Python program that runs in the background, detects when a USB drive is mounted, and automatically copies selected files—filtered by type, size, or modification date—to a local folder, illustrating core file‑handling techniques.
This article presents a concise collection of over one hundred frequently used Python functions across twelve categories—basic I/O, control flow, data structures, string formatting, dictionaries, custom functions, threading, modules, file handling, decorators, and regular expressions—each illustrated with clear code examples to help beginners quickly memorize and apply them.
This article demonstrates how to use Python's ReportLab library, specifically the Table and TableStyle classes, to programmatically generate PDF documents such as custom greeting cards, covering basic Table usage, styling options, and step-by-step code examples for creating and customizing PDF layouts.
This article introduces Plotly's offline plotting in Jupyter Notebook, explains the key parameters of plotly.offline.iplot, demonstrates how to create and combine traces, and shows how to customize layout elements such as fonts, titles, axes, legends, grids, and other figure properties using Python code.
This article walks through a real‑world Pandas problem where British and American date formats are mixed, showing how to detect, clean, and convert the dates—including handling empty rows—using concise code and clear visual examples.
This article explains Prophet’s algorithmic approach to time‑series forecasting, covering decomposition into trend, seasonality, holidays and error components, logistic and piecewise linear trend models, automatic change‑point detection, Fourier‑based seasonality, holiday handling, model fitting with PyStan, and practical Python code examples.
This article introduces ten Python packages that automate exploratory data analysis, explaining each library's capabilities, providing concise usage examples, and showing how they can generate comprehensive data summaries and visualizations with just a few lines of code.
This article presents a full case study that uses Data Envelopment Analysis (DEA) with Python to assess the efficiency of 13 airlines based on fleet size, fuel consumption, employee count, passenger‑miles and freight‑ton‑miles, detailing data preparation, model construction, solution steps, results and practical conclusions.
This article surveys twenty data‑visualization tools—covering entry‑level options like Excel, online JavaScript libraries such as D3 and Google Chart API, interactive GUI utilities, map frameworks, advanced desktop environments, and expert‑grade platforms like R, Weka and Gephi—highlighting their key features, formats supported and typical use cases.
This article introduces the mysqlreplicate utility, explains how to run it with common command‑line options, and provides a step‑by‑step source‑code analysis that checks server‑id and UUID uniqueness, InnoDB compatibility, storage‑engine consistency, binary‑log settings, and finally creates and starts the replication process.
This tutorial walks through creating high‑quality scientific figures in Python by customizing Matplotlib globally, removing spines, adjusting tick parameters, adding axis labels, and then demonstrates the use of the SciencePlots and Proplot libraries for consistent styling and advanced layout options.
This article lists the key SciPy sparse‑graph functions—such as connected components, Laplacian, various shortest‑path algorithms, traversals, minimum spanning tree, flow and matching utilities—and provides Python code examples demonstrating their use.
This article introduces the VIKOR multi‑criteria decision‑making method, explains its core concepts, outlines each computational step, compares it with TOPSIS, presents a real‑world energy‑saving case study, and provides a complete Python implementation.
This guide introduces SciPy's optimize module, covering scalar and multivariate minimization, global optimization algorithms, root finding, linear programming, and assignment problems, complete with clear Python code examples and explanations of each method's usage and output.
This article explains how to use advanced XPath expressions in Python web scraping to exclude unwanted HTML elements, providing step‑by‑step code examples and practical tips for filtering tags based on style attributes and combining logical operators.
This article presents a comprehensive Python-based analysis of a large game dataset (2.29 million records, 109 fields), covering user registration trends, payment rates, ARPU/ARPPU calculations, level‑based spending behavior, and consumption patterns of resources and acceleration items, with visualizations and actionable conclusions.
This article explains how to use Python's requests and BeautifulSoup libraries to crawl Divnil.com, extract image detail page URLs, parse each page for high‑resolution image links, and download the images into a local folder with a complete, runnable script.
According to the latest August TIOBE ranking, Python's market share rose to a record 15.42%, while other languages such as PHP, Go, Ruby, Rust, and Kotlin experienced notable position changes, reflecting shifting popularity trends across the programming ecosystem.
Numba is a Python just‑in‑time compiler that transforms functions into fast native machine code, enabling near C‑level performance without rewriting code; by adding simple decorators like @jit or @njit, you can accelerate loops, NumPy operations, and even leverage parallel or GPU execution.
This article introduces thirty unique and practical Python packages that simplify various aspects of data workflows, including model training notifications, progress tracking, data validation, statistical calculations, date handling, and more, providing installation commands and code examples for each tool.
This article introduces ten Python data‑visualization libraries—ranging from the classic matplotlib to modern interactive tools like Bokeh and Plotly—explaining their main features, typical use cases, and where to find more information.
This article explains how to use Python to copy a specific area of an Excel worksheet together with its formatting, walks through the provided code solution, highlights common pitfalls, and offers a concise, refined implementation for seamless Excel automation.
This guide explains how to build a custom Label Studio ML backend by extending LabelStudioMLBase to wrap a YOLOv5 or MMDetection model, modify its prediction logic, launch the service, and configure the frontend for automated object‑detection annotation, including deployment details and a recruitment notice.
This article examines the historical origin of the ++ and -- operators, explains why they were introduced, demonstrates that modern compilers no longer gain performance from them, and argues that functional‑style design, iterator‑based loops, and operator‑overloading concerns have led many contemporary languages to remove or deprecate these operators.
This article introduces Python's DB‑API, lists supported databases, demonstrates how to install and use PyMySQL for basic CRUD operations, shows techniques for preventing SQL injection, and explains two connection‑pooling models with DBUtils, including code examples and a brief promotional note at the end.
This article explains why discretizing continuous variables improves model stability, introduces three common binning techniques—equal-width, equal-frequency, and clustering—and demonstrates how to implement each using scikit‑learn's KBinsDiscretizer with Python code examples on a synthetic score dataset.
This tutorial demonstrates how to accelerate processing of a multi‑million‑row CSV dataset by splitting the work into sub‑tasks and applying Python's multiprocessing, joblib, and tqdm libraries for serial, parallel, and batch processing, showing significant speed‑ups and best‑practice code snippets.
This article demonstrates how to replace tedious manual Excel reporting by using Python libraries pandas and xlwings to read multiple sheets, merge data, write the combined DataFrame back to Excel, and apply conditional formatting such as font colors, borders, and cell shading based on statistical thresholds.
This guide explains the theory behind Vector Autoregression (VAR) models, outlines the complete modeling workflow—including data preparation, stationarity and cointegration testing, lag order selection, parameter estimation, stability diagnostics, and impulse‑response and variance‑decomposition analysis—and provides a full Python implementation with code examples.
This guide explains how to combine the open‑source labeling platform Label Studio with the YOLOv5 object‑detection model to achieve semi‑automatic annotation, covering installation of both tools, project creation, dataset configuration, and training a custom YOLOv5 model on your own data.
This article introduces the fundamentals of convolutional neural networks (CNN), explains key layers such as convolution, pooling, and fully connected layers, and provides a step‑by‑step Python implementation using Keras to load data, construct, compile, train, and evaluate a CNN model on the digits dataset.
This article explains the purpose of the Singleton design pattern, demonstrates multiple Python implementations—including module‑level singletons, decorators, class‑based approaches, __new__ method, and metaclass techniques—and shows how to add thread‑safety with locks to ensure only one instance exists across concurrent executions.
This article presents a collection of practical Python and Jupyter Notebook tips—including pandas‑profiling for quick data exploration, interactive plotting with Cufflinks/Plotly, useful magic commands, debugging shortcuts, and styled alert boxes—to boost productivity and streamline data analysis workflows.
Learn how to load the California housing dataset, preprocess features, construct a Keras sequential regression MLP, train it with SGD, evaluate performance, and make predictions, all illustrated with concise Python code snippets.
This article explains why Python is an ideal language for data analysis, covering its simplicity, extensive libraries, compatibility with big‑data platforms, and a step‑by‑step workflow that includes data acquisition, storage, preprocessing, modeling, and visualization, while also highlighting useful tools and resources.
An in‑depth guide to sklearn.svm explains SVM classification and regression, details key parameters such as C and kernel types, demonstrates how to use GridSearchCV for hyperparameter tuning, and provides complete Python code examples for iris classification and California housing price prediction.
This tutorial walks through using Keras to create, compile, train, and evaluate a multi‑layer perceptron for image classification on the Fashion MNIST dataset, covering data loading, model construction with the Sequential API, hyperparameter choices, and prediction of new samples.
Django 4.1 has been officially released, introducing asynchronous ORM interfaces, class‑based view async handlers, database‑level model validation, and enhanced form rendering accessibility, while also marking the end of mainstream support for Django 4.0, which will receive only security fixes until April 2023; the article also provides pip and Git commands for installing the latest stable or development versions and a brief overview of Django’s core principles.
Alibaba Cloud reports slowing internet demand but rising industrial digitalization, while Python hits a historic market‑share high and GitLab bans Windows and prunes idle projects, together highlighting evolving trends in cloud strategy, programming language popularity, and open‑source platform security.
This tutorial explains how to create a WeChat intelligent chatbot using Python, itchat, and the Turing API, covering module installation, API interaction, message handling with decorators, QR‑code login, and continuous execution, all demonstrated with concise code examples.
This article introduces essential Python string methods—including upper(), lower(), count(), strip(), lstrip(), rstrip(), split(), join(), replace(), isdigit(), isspace(), startswith(), and endswith()—explaining their use cases with clear examples and code snippets for effective text processing.
This article explains the PageObject design pattern for Selenium-based test automation in Python, detailing its principles, structure, and step-by-step implementation with example code for pages, base classes, test cases, and execution scripts to improve maintainability and reduce duplication.
Fury is a JIT‑based native multi‑language serialization framework that automatically handles shared and cyclic references, offers zero‑copy support, and delivers 20‑200× speed improvements over existing solutions, making it a high‑performance drop‑in replacement for Java, Python, Go, and C++ serialization needs.
This article explains how to parse intricate datetime strings in Python using the datetime module, presents multiple code solutions with full examples, and provides a reusable function to convert UTC timestamps to Beijing time, helping readers handle common time‑formatting challenges.
Using a real‑world housing example, this article explains supervised and unsupervised learning, walks through building a price‑prediction function, introduces gradient descent for optimizing weights, and highlights pitfalls like overfitting, offering a practical introduction to core machine‑learning concepts.
This article explains the concept of differencing for extracting deterministic information, outlines when to use first, second, or seasonal differencing, introduces the ARIMA(p,d,q) model and its special cases, and provides a complete Python example with code and visualizations.
This article introduces an AI-powered makeup transfer technique that copies makeup from any reference image onto a user's photo, explains its advantages over traditional sticker-based apps, outlines a three‑step workflow, and provides sample Python code runnable on Huawei Cloud ModelArts.
This article explains why native pointers do not exist in Python, describes the underlying object model, immutable versus mutable objects, the distinction between variables and names, and demonstrates several practical ways to emulate pointer behavior using mutable containers, custom classes, and the ctypes module.
This guide explains how to leverage Seaborn's FacetGrid to create multiple coordinated plots, covering basic usage, parameter options, and customization techniques such as adding legends, titles, axis labels, figure size, and DPI settings, with complete Python code examples.
This article explains Python's conditional statements, covering the syntax and usage of single‑branch if, two‑branch if‑else, multi‑branch if‑elif‑else structures, the pass keyword, ternary expressions, nesting rules, and best‑practice tips for writing clear and efficient control‑flow code.
Learn to load the sunspots.csv dataset, fit an ARMA(4,2) model with statsmodels, evaluate it using AIC/BIC, visualize original and predicted values, and forecast the 1989 sunspot count, all with step‑by‑step Python code and plots.
This tutorial walks you through creating a fully functional Snake game in Python with Pygame, covering required environment setup, visual assets, and a complete source code example that demonstrates grid handling, movement logic, collision detection, and scoring.
