How to Find Stock-Specific Moves in the S&P 500 with Python

Using LlamaIndex for RAG in Python – Real Python

Khóa học hướng dẫn xây dựng ứng dụng RAG (Retrieval-Augmented Generation) bằng Python với LlamaIndex, từ thiết lập môi trường, tải tài liệu, tạo và lưu trữ indexes tìm kiếm, cấu hình nhà cung cấp AI (local/remote) đến chạy truy vấn nhằm giảm thiểu ảo giác (hallucination) từ LLM.

Là người phát triển Python muốn xây dựng hệ thống xử lý thông tin tự động với chất lượng cao, LlamaIndex giúp bạn tự động hóa việc kết hợp tìm kiếm và sinh lời từ mô hình ngôn ngữ lớn, giảm thiểu sai sót và tối ưu hóa hiệu suất cho ứng dụng của mình.

Python Is Not Enough: Why Pythonistas Love Rust (Podcast)

A podcast episode recap covering why Python developers are adopting Rust, featuring discussion of Rust tooling (Ruff, uv, Polars, Pydantic core), how Rust's strictness benefits AI agent guardrails, and a skeptical take on vibe coding. The author argues real AI productivity gains are closer to 1.2-2x rather than 10x, warns about rubber-stamping AI-generated code, and emphasizes that deep engineering fundamentals outlast hype cycles. The post also promotes a 6-week Python-to-Rust cohort building a JSON parser with PyO3 bindings.

Why I wrote PEP 832 -- virtual environment discovery

Brett Cannon explains the motivation behind PEP 832, a proposal for standardizing Python virtual environment discovery. The core problem is that tools like VS Code have no reliable way to know which workflow tool (uv, Poetry, Hatch, etc.) a project uses, or where its environments are stored. Cannon proposes a .python-envs file listing environment paths and a [workflow] table in pyproject.toml to specify a workflow server protocol (WSP) over JSON-RPC, enabling editors to communicate with any workflow tool in a standardized way rather than requiring bespoke extensions per tool.

Explicit Lazy Imports Are Coming to Python 3.15

Python 3.15 introduces explicit lazy imports via PEP 810, allowing modules to be deferred until their attributes are first accessed. This reduces startup latency and memory consumption, especially useful in large applications and CLI tools that conditionally use heavy libraries. The post demonstrates the feature using Python 3.15.0b1 (installable via uv or pyenv), profiles import times with the tuna tool showing pandas being skipped when unused, and walks through the internal mechanism using pdb breakpoints to observe sys.lazy_modules and sys.modules state changes during reification. PyCharm 2026.1 does not yet fully support the new lazy keyword syntax.

Beyond the Straight Line: Choosing Between OLS, Interaction Terms, and Tweedie Regression

A practical guide comparing three regression approaches for datasets with zero-inflation and heavy tails: standard OLS, OLS with interaction terms, and Tweedie regression. Using the French Motor Third-Party Liability Claims dataset, the author demonstrates that OLS fails on zero-inflated insurance data, interaction terms provide only marginal improvement, while Tweedie regression reduces MAE by ~35%. A bonus two-step zero-inflated model combining LightGBM (claim occurrence classifier) with Tweedie regression (severity estimator) achieves an additional 21% MAE reduction, reaching an MAE of 87.79 versus OLS's 174.17.

Hexora v0.3: New features and improvements

Hexora v0.3 is a Python library for detecting malicious PyPI packages using static analysis. The new release adds a gradient boosting machine learning model that analyzes code structure, semantic features, and static analysis results to assess entire Python files. The ML model's primary role is filtering false positives — previously yielding 5-10 false positives per real finding. Running against newly published PyPI packages, it now detects 2-10 malicious packages daily. Remaining false positives mostly come from AI-related projects that use dynamic code execution, base64-inlined assets, or telemetry.

Bitbucket Packages adds PyPI and NuGet support

Bitbucket Packages bổ sung hỗ trợ PyPI (Python) và NuGet (.NET), tích hợp quản lý package vào Bitbucket cùng các registry sẵn có (container, Maven, npm). Tất cả năm registry chia sẻ chung mô hình quyền, thanh toán và dung lượng, nhưng PyPI/NuGet chỉ khả dụng trên gói Standard/Premium trả phí.

Lập trình viên phát triển ứng dụng Python hoặc .NET sẽ tìm hiểu Bitbucket Packages để tiết kiệm thời gian quản lý và chia sẻ gói phụ thuộc một cách hiệu quả hơn, tránh việc phụ thuộc vào các nền tảng bên ngoài như PyPI hoặc NuGet độc lập.