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Python Weekly

Welcome to issue 630 of Python Weekly. Let's get straight to the links this week.

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Articles, Tutorials and Talks

Vector Search RAG Tutorial – Combine Your Data with LLMs with Advanced Search

Learn how to use vector search and embeddings to easily combine your data with large language models like GPT-4. You will first learn the concepts and then create three projects.

Annotated At Runtime
PEP 593 is a bit vague on how you’re supposed to actually consume arguments to Annotated; here is my proposal.

pytest daemon: 10X Local Test Iteration Speed
At Discord, their Python test suite suffered from slow local test runs, taking 13 seconds per test. They built a pytest daemon that improves local test iteration speed by 10x, significantly reducing development time. This solution involves offloading heavy work to a background process and caching results, bypassing slow imports and fixtures.

How Many Lines of C it Takes to Execute a + b in Python?
Understand the mechanics of dynamic dispatch implementation in CPython.

Why if TYPE_CHECKING?
The article discusses the use of conditional imports in Python, particularly the if TYPE_CHECKING pattern, to address differences in typechecking enforced by tools like mypy and typechecking at runtime. It explores the need for this pattern when dealing with large sets of custom classes that depend on each other and could result in circular dependencies.

The Fanout Pattern Explained
The article discusses the use of the fanout pattern in the context of Celery tasks, where a single task can be replaced with a variable number of other tasks. It provides a practical example of the fanout pattern and its application in handling complex task signatures, emphasizing its power in task design and management within the Celery framework. The fanout pattern is illustrated through code examples, demonstrating its ability to handle sequential and parallel task execution, offering insights into its effectiveness for task orchestration and workload distribution

Django: Sanitize incoming HTML fragments with nh3
Let’s look at how to use nh3 for HTML sanitisation in Django forms. You can adapt this approach to other situations, such as in DRF serializers.

Real-world match/case
Python 3.10 introduced structural pattern matching, known as match/case, which allows for matching patterns in the structure of data. The article provides a real-world example of using match/case to simplify the examination of complex JSON payloads received from a GitHub bot, demonstrating its practical application in handling deeply nested data structures. The author highlights how match/case made the task much simpler compared to traditional methods of picking apart the payloads

Interesting Projects, Tools and Libraries

coffee
Build and iterate on your UI 10x faster with AI - right from your own IDE.

µHTTP
µHTTP emerged from the need of a simple web framework. It's great for micro-services, single page applications, AND monolithic monsters.

PurpleLlama
Set of tools to assess and improve LLM security.

Arrest
Arrest is a small utility to easily structure and validate your REST api calls using pydantic and httpx.

LLMCompiler
An LLM Compiler for Parallel Function Calling.

Pearl
A Production-ready Reinforcement Learning AI Agent Library brought by the Applied Reinforcement Learning team at Meta.

Mamba-Chat
Mamba-Chat is the first chat language model based on a state-space model architecture, not a transformer.

Netchecks
Netchecks is a set of tools for testing network conditions and asserting that they are as expected.

concordia
A library for generative social simulation.

Cyclopts
Intuitive, easy CLIs based on python type hints.

UniDep
Single source of truth with requirements for pip and conda.

New Releases

Python in Visual Studio Code – December 2023 Release
This release includes the following announcements:

Configurable debugging options added to Run button menu
Show Type Hierarchy with Pylance
Deactivate command support for automatically activated virtual environments in the terminal
Setting to turn REPL Smart Send on/off and a message when it is unsupported

Python 3.12.1

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