RAG, Pyrefly vs. ty, Nested Loops and Functional programming

with some more interesting news, articles, packages and projects

Jun 07, 2025

Monkey-Patched PyPI Packages Use Transitive Dependencies to Steal Solana Private Keys

Malicious PyPI package semantic-types steals Solana private keys via transitive dependency installs using monkey patching and blockchain exfiltration.

Python 3.13.4, 3.12.11, 3.11.13, 3.10.18 and 3.9.23 are now available

Registration is now open for Python for Good

Python Discord Event: Project Show-and-Tell

This will be an opportunity for community members to present their Python projects.

Articles

Decorators and Functional programming

In this article, Racey Chan explained key functional programming concepts: function composition, currying, closures, etc, using Python decorators through practical examples.

# Racey Chan

Python RAG API Tutorial with LangChain & FastAPI – Complete Guide

In this article, Vitalii Honchar explained how to build AI-powered apps that can chat with uploaded PDF files. He showed how to implement Retrieval Augmented Generation (RAG) using FastAPI for the API and LangChain to interact with OpenAI.

# Vitalii Honchar

Nested Loops in Python

Nested loops are often discouraged, but they make perfect sense in scenarios like handling multidimensional data or generating patterns. In this article, Amanda Adoyi explained what nested loops are, shared practical examples, highlighted common pitfalls and offered tips on how to optimise them.

# Amanda Adoyi

Loading Pydantic models from JSON without running out of memory

When working with large JSON files and loading them into Pydantic, memory usage can become a concern. Instead of using model_validate_json, it's better to use parsers like ijson to handle data efficiently. In this article, Itamar Turner-Trauring explained how to do that and also shared another memory-saving approach using dataclasses with __slots__ for better performance.

# Itamar Turner-Trauring

Pyrefly vs. ty: Comparing Python’s Two New Rust-Based Type Checkers

Last month, two new Rust-based Python type checkers pyrefly and ty were released. Both of them are in the alpha stage. While they share some similarities, they differ significantly in design and features. In this article, Edward Li dove deep into both tools, highlighted their differences and what makes each one unique.